JPH0451964B2 - - Google Patents
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- Publication number
- JPH0451964B2 JPH0451964B2 JP21697288A JP21697288A JPH0451964B2 JP H0451964 B2 JPH0451964 B2 JP H0451964B2 JP 21697288 A JP21697288 A JP 21697288A JP 21697288 A JP21697288 A JP 21697288A JP H0451964 B2 JPH0451964 B2 JP H0451964B2
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- JP
- Japan
- Prior art keywords
- mol
- weight
- parts
- oxide
- semiconductor ceramic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004065 semiconductor Substances 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 16
- 239000011572 manganese Substances 0.000 claims description 15
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 12
- 238000010405 reoxidation reaction Methods 0.000 claims description 10
- 229910052573 porcelain Inorganic materials 0.000 claims description 8
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 7
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052779 Neodymium Inorganic materials 0.000 claims description 5
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 5
- 229910052772 Samarium Inorganic materials 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910002113 barium titanate Inorganic materials 0.000 claims description 5
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 5
- 229910052684 Cerium Inorganic materials 0.000 claims description 4
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052727 yttrium Inorganic materials 0.000 claims description 4
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 2
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 claims description 2
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 2
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims description 2
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052746 lanthanum Inorganic materials 0.000 claims 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims 1
- 239000010936 titanium Substances 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 description 14
- 239000003985 ceramic capacitor Substances 0.000 description 10
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 229940093474 manganese carbonate Drugs 0.000 description 1
- 235000006748 manganese carbonate Nutrition 0.000 description 1
- 239000011656 manganese carbonate Substances 0.000 description 1
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 1
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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- Ceramic Capacitors (AREA)
Description
［産業上の利用分野］
本発明は還元再酸化型半導体コンデンサ用磁器
組成物及び磁器に関する。
［従来の技術］
半導体磁器コンデンサの１種として還元再酸化
型半導体磁器コンデンサが知られている。この還
元再酸化型半導体磁器コンデンサの誘電体はチタ
ン酸バリウム系磁器から成り、例えば特公昭63−
28492号公報に開示されているように、炭酸バリ
ウム（BaCO2）と酸化チタン（TiO2）と希土類
元素の酸化物（Nd，Pr，Sm、Eu，Gd，Dy，
Laの酸化物の少なくとも１種）と、Cr，Mn，
Fe，Co及びNiの内の少なくとも１種の酸化物と
から成る混合物（原料組成物）を用意し、この成
形体を形成し、これを酸化性雰囲気中で焼結さ
せ、得られた焼結体を還元性雰囲気で加熱処理
し、更に酸化性雰囲気中で加熱処理（再酸化処
理）して得る。
［発明が解決しようとする課題］
上述の還元再酸化型半導体磁器コンデンサは、
小型化、大容量化が図れ、且つ高い耐電圧を得る
ことができるという特長を有する。しかし、従来
の磁器組成物では高耐電圧を保つたままより一層
の大容量化を図ることが困難であつた。即ち、絶
縁破壊電圧Vbdを例えば600V以上にしようとす
ると、単位面積当りの静電容量Ｃが0.3〜0.6μF／
cm2程度に低下し、逆に容量Ｃを0.7μF／cm2以上に
しようとすると、絶縁破壊電圧Vbdが300〜400V
程度に低下した。
そこで、本発明の目的は、絶縁破壊電圧Vbdが
500V以上、単位面積当りの静電容量Ｃが0.6μF／
cm2以上の還元再酸化型半導体磁器コンデンサを得
ることが可能な磁器組成物及び磁器を提供するこ
とにある。
［課題を解決するための手段］
上記目的を達成するための本発明は、100.00重
量部の主成分と、Mn（マンガン）に換算して、
0.03〜0.30重量部のMn化合物と、0.01〜0.20重量
部のBi2O3（酸化ビスマス）とから成り、前記主
成分が81.5〜96.5モル％のBaTiO3（チタン酸バリ
ウム）と、La（ランタン）に換算して1.0〜4.0モ
ル％のLa2O3（酸化ランタン）と、Ce（セリウム）、
Pr（プラセオジム）、Nd（ネオジム）、Sm（サマリ
ウム）及びＹ（イツトリウム）の内の少なくとも
１種から成る希土類元素に換算して0.5〜3.0モル
％の前記希土類元素の酸化物と、2.0〜11.5モル
％のTiO2（酸化チタン）とから成ることを特徴と
する還元再酸化型半導体磁器コンデンサ用磁器組
成物に係わるものである。
なお、上記磁器組成物を焼成及び熱処理するこ
とにより、請求項２に示す磁器を得ることができ
る。
［作用］
本発明に従う磁器組成物によつて還元再酸化型
半導体磁器コンデンサを作製すると、500V以上
の絶縁破壊電圧Vbdを有し且つ0.6μF／cm2以上の
単位面積当りの静電容量Ｃを得ることができる。
［実施例］
次に、本発明の実施例を説明する。
第１表の試料No.１の組成物の主成分を得るため
に、
BaTiO3を2000.00ｇ（90.8モル％）、
La2O3を29.23ｇ（Laに換算して1.9モル％）、
Nd2O3を12.71ｇ（Ndに換算して0.8モル％）、
CeO2を11.38ｇ（Ceに換算して0.7モル％）、
Pr2O3を9.34ｇ（Prに換算して0.6モル％）、
TiO2を39.24ｇ（5.2モル％）
秤量した。即ち、BaTiO3の90.8モル％と、Laの
1.9モル％と、Ndの0.8モル％と、Ceの0.7モル％
と、Prの0.6モル％と、TiO2の5.2モル％との和が
100モル％となるようにBaTiO3，La2O3，Nd2
O3，CeO2，Pr2O3，TiO2を秤量した。
また、添加成分としてMnCO3（炭酸マンガン）
を4.40ｇ、Bi2O3を2.10ｇ秤量した。なお、上記
主成分の合計重量と4.40ｇのMnCO3との割合は、
100重量部の上記主成分と0.1重量部のMnとの割
合に対応する。また、上記主成分の合計重量と
2.10ｇのBi2O3との割合は、100重量部の上記主成
分と0.1重量部のBi2O3との割合が対応する。要す
るに、100重量部の主成分に対してMnが0.1重量
部、Bi2O3が0.1重量部となるようにMnCO3とBi2
O3とを秤量した。
次に、上記主成分及び添加成分を湿式混合し、
脱水乾燥後有機バインダを入れて混練し、しかる
後、外径1.5mm、内径0.9mm、厚み0.3mm、長さ3.7
mmの円筒状成型体を得た。
次に、得られた成型体を大気中1320℃で２時間
焼成して誘電体（絶縁体）磁器の焼結体を得、こ
の誘電体磁器を還元性雰囲気中1050℃で２時間熱
処理（半導体化処理）して半導体磁器に変化さ
せ、更に得られた半導体磁器を大気中970℃で１
時間熱処理（再酸化処理）を行つて図面で原理的
に示すように半導体磁器１の表面に誘電体層２を
作つた。なお、半導体磁器１の組成は原料組成に
対応している。また、表面誘電体層２は半導体磁
器１の酸化物から成る。
次に、表面誘電体層２の上に銀（Ag）ペース
トを塗布し、850℃で10分間焼付けることによつ
て一対の電極３，４を形成し、半導体磁器コンデ
ンサを完成させた。
得られたコンデンサの電極３，４にそれぞれリ
ード線を半田付けし、単位面積当りの静電容量
Ｃ、tanδ、絶縁抵抗IR、絶縁破壊電圧Vbdを測
定したところ、第２表に示すように、Ｃは
0.72μF／cm2、tanδは3.2％、IRは２×104MΩ、
Vbdは700Vであつた。
なお、Ｃ及びtanδは測定電圧0.1V、測定周波
数1kHz条件で測定し、IRは直流電圧50Vを15秒
間印加した後に測定し、Vbdは直流昇圧破壊方式
で測定した。
試料No.２〜39においても、組成を第１表に示す
ように変えた他は試料No.１と同一方法でコンデン
サを作り、同一方法で電気的特性を測定した。
磁器組成物の組成を示す第１表において、主成
分のBaTiO3とLaとＸとTiO2はモル％で示され
ている。主成分に含まれているＸはCe，Pr，
Nd，Sm，Ｙの内の少なくとも１種から成る希土
類元素である。添加成分のMn及びBi2O3は主成
分100重量部に対する添加重量部で示されている。
[Industrial Field of Application] The present invention relates to a ceramic composition and ceramic for reduction and reoxidation type semiconductor capacitors. [Prior Art] A reduction and reoxidation type semiconductor ceramic capacitor is known as a type of semiconductor ceramic capacitor. The dielectric of this reduction and reoxidation type semiconductor ceramic capacitor is made of barium titanate ceramic.
As disclosed in Publication No. 28492, barium carbonate (BaCO 2 ), titanium oxide (TiO 2 ), and rare earth element oxides (Nd, Pr, Sm, Eu, Gd, Dy,
at least one type of oxide of La), Cr, Mn,
A mixture (raw material composition) consisting of at least one oxide of Fe, Co, and Ni is prepared, a molded body is formed, and this is sintered in an oxidizing atmosphere. The body is heat-treated in a reducing atmosphere and then further heat-treated in an oxidizing atmosphere (re-oxidation treatment). [Problem to be solved by the invention] The above-mentioned reduction and reoxidation type semiconductor ceramic capacitor has the following problems:
It has the features of being able to be made smaller, have a larger capacity, and have a higher withstand voltage. However, with conventional ceramic compositions, it has been difficult to increase the capacity while maintaining a high withstand voltage. In other words, if you try to increase the dielectric breakdown voltage Vbd to 600V or more, the capacitance C per unit area will be 0.3 to 0.6μF/
cm2 , and if you try to increase the capacitance C to 0.7μF/cm2 or more , the dielectric breakdown voltage Vbd will be 300 to 400V.
It has decreased to a certain extent. Therefore, an object of the present invention is to reduce the dielectric breakdown voltage Vbd.
500V or more, capacitance C per unit area is 0.6μF/
The object of the present invention is to provide a ceramic composition and ceramic that can obtain a reduced and reoxidized semiconductor ceramic capacitor of cm 2 or more. [Means for Solving the Problems] The present invention for achieving the above object consists of 100.00 parts by weight of the main component and Mn (manganese),
It consists of 0.03 to 0.30 parts by weight of Mn compound and 0.01 to 0.20 parts by weight of Bi 2 O 3 (bismuth oxide), and the main components are 81.5 to 96.5 mol% of BaTiO 3 (barium titanate) and La (lanthanum oxide). ) and 1.0 to 4.0 mol% La 2 O 3 (lanthanum oxide), Ce (cerium),
0.5 to 3.0 mol% of an oxide of the rare earth element consisting of at least one of Pr (praseodymium), Nd (neodymium), Sm (samarium), and Y (yttrium); The present invention relates to a ceramic composition for a reduction and reoxidation type semiconductor ceramic capacitor characterized by comprising mol% of TiO 2 (titanium oxide). Incidentally, the porcelain according to claim 2 can be obtained by firing and heat-treating the above-mentioned porcelain composition. [Function] When a reduction and reoxidation type semiconductor ceramic capacitor is manufactured using the ceramic composition according to the present invention, it has a dielectric breakdown voltage Vbd of 500 V or more and a capacitance C per unit area of 0.6 μF/cm 2 or more. Obtainable. [Example] Next, an example of the present invention will be described. In order to obtain the main components of the composition of sample No. 1 in Table 1, 2000.00 g (90.8 mol%) of BaTiO 3 , 29.23 g (1.9 mol% in terms of La) of La 2 O 3 , Nd 2 12.71 g of O 3 (0.8 mol % in terms of Nd), 11.38 g of CeO 2 (0.7 mol % in terms of Ce), 9.34 g of Pr 2 O 3 (0.6 mol % in terms of Pr), 39.24 g (5.2 mol%) of TiO 2 was weighed. That is, 90.8 mol% of BaTiO3 and
1.9 mol%, 0.8 mol% of Nd, 0.7 mol% of Ce
The sum of 0.6 mol% of Pr and 5.2 mol% of TiO 2 is
BaTiO 3 , La 2 O 3 , Nd 2 to be 100 mol%
O 3 , CeO 2 , Pr 2 O 3 , and TiO 2 were weighed. In addition, MnCO 3 (manganese carbonate) is added as an additive component.
and 2.10 g of Bi 2 O 3 were weighed. The ratio between the total weight of the above main components and 4.40g of MnCO 3 is:
This corresponds to a ratio of 100 parts by weight of the above main components and 0.1 parts by weight of Mn. In addition, the total weight of the above main components and
The ratio of 2.10 g of Bi 2 O 3 corresponds to the ratio of 100 parts by weight of the main component and 0.1 part by weight of Bi 2 O 3 . In short, MnCO 3 and Bi 2 are mixed so that Mn is 0.1 part by weight and Bi 2 O 3 is 0.1 part by weight for 100 parts by weight of the main component.
O 3 was weighed. Next, wet mix the above main ingredients and additive ingredients,
After dehydration and drying, an organic binder is added and kneaded, and then the outer diameter is 1.5 mm, the inner diameter is 0.9 mm, the thickness is 0.3 mm, and the length is 3.7 mm.
A cylindrical molded body of mm was obtained. Next, the obtained molded body is fired in the air at 1320°C for 2 hours to obtain a sintered body of dielectric (insulator) porcelain, and this dielectric porcelain is heat treated at 1050°C in a reducing atmosphere for 2 hours (semiconductor oxidation treatment) to transform it into semiconductor porcelain, and then heat the obtained semiconductor porcelain in the atmosphere at 970℃ for 1
A time heat treatment (reoxidation treatment) was performed to form a dielectric layer 2 on the surface of the semiconductor ceramic 1 as shown in principle in the drawings. Note that the composition of the semiconductor ceramic 1 corresponds to the raw material composition. Further, the surface dielectric layer 2 is made of an oxide of the semiconductor ceramic 1. Next, silver (Ag) paste was applied onto the surface dielectric layer 2 and baked at 850° C. for 10 minutes to form a pair of electrodes 3 and 4, completing a semiconductor ceramic capacitor. Lead wires were soldered to electrodes 3 and 4 of the obtained capacitor, respectively, and the capacitance per unit area C, tan δ, insulation resistance IR, and dielectric breakdown voltage Vbd were measured, as shown in Table 2. C is
0.72μF/cm 2 , tanδ is 3.2%, IR is 2×10 4 MΩ,
Vbd was 700V. Note that C and tan δ were measured under conditions of a measurement voltage of 0.1 V and a measurement frequency of 1 kHz, IR was measured after applying a DC voltage of 50 V for 15 seconds, and Vbd was measured by a DC boost breakdown method. For Samples No. 2 to 39, capacitors were made in the same manner as in Sample No. 1 except that the compositions were changed as shown in Table 1, and the electrical characteristics were measured in the same manner. In Table 1 showing the composition of the porcelain composition, the main components BaTiO 3 , La, X and TiO 2 are shown in mol%. X contained in the main components are Ce, Pr,
It is a rare earth element consisting of at least one of Nd, Sm, and Y. The additive components Mn and Bi 2 O 3 are shown in parts by weight relative to 100 parts by weight of the main component.
【表】【table】
【表】【table】
【表】【table】
【表】【table】
【表】
第１表及び第２表から明らかなように、本発明
に従う組成物によれば、絶縁破壊電圧Vbdが500
〜800V、単位面積当りの静電容量が0.6〜
0.8μF／cm2のコンデンサを得ることができる。
一方、試料No.２，６，20，21，23，26，27，
30，31，35，36，39では本発明の目的を達成する
ことができない。従つて、これ等は本発明の範囲
外のものであり、比較例として掲載されている。
次に組成の限定理由を説明する。
Laが1.0モル％未満となると、Laの添加効果が
小さくなり過ぎてコンデンサの絶縁破壊電圧Vbd
が目標値よりも低くなる。一方、Laが4.0モル％
よりも多くなると、表面誘電体層２の誘電率が低
くなり、単位面積当りの静電容量Ｃが目標値より
も小さくなる。従つて、Laの好ましい範囲は1.0
〜4.0モル％である。
Ｘ（Ce，Pr，Nd，Sm，Ｙの少なくとも１種）
が１種又は複数種の合計で0.5モル％未満になる
と、表面誘電体層２の誘電率を上げる効果を十分
に得ることができなくなり、静電容量Ｃが目標値
未満になる。一方、Ｘが3.0モル％よりも多くな
ると、絶縁破壊電圧Vbdが目標値よりも低くな
る。従つてＸの好ましい範囲は0.5〜3.0モル％で
ある。
BaTiO3を81.5〜96.5モル％の範囲外及びTiO2
を2.0〜11.5モル％の範囲外にすると、焼結性が
悪くなり、静電容量Ｃ及び絶縁破壊電圧Vbdが低
下する。
Mnを0.03重量部未満にすると、表面誘電体層
２を均一に形成することが困難になり、絶縁破壊
電圧Vbdが低下する。Mnを0.30重量部より多く
すると、表面誘電体層２を薄く形成することが困
難になり、絶縁破壊電圧Vbdを高く保つたまま静
電容量Ｃを高くすることができない。従つて、
Mnの好ましい範囲は0.03〜0.30重量部である。
Bi2O3は焼結性を改善する成分であるが、この
Bi2O3が0.01重量部未満だと、焼結性改善効果を
ほとんど期待することができず、静電容量Ｃ及び
絶縁破壊電圧の向上を望めない。Bi2O3が0.20重
量部よりも多くなると、焼結性が逆に悪くなる。
従つて、Bi2O3の好ましい範囲は0.01〜0.20重量
部である。
［変形例］
本発明は上述の実施例に限定されるものでな
く、例えば次の変形が可能なものである。
(1) MnCO3の代りにMnO2を使用してもよい。
(2) 酸化性雰囲気による焼成（焼結）時の温度を
1260〜1400℃で、還元性雰囲気の加熱処理温度
を900〜1180℃、再酸化処理の温度を900〜1100
℃の範囲で変えることができる。
(3) BaTiO3の代りにBaCO3とTiO2を出発材料
としてもよい。
(4) 電極３，４の内の一方の下の誘電体層２を省
くことができる。
［発明の効果］
上述のように本発明によれば、絶縁破壊電圧が
500V以上、単位面積当りの静電容量が0.6μF／cm2
以上の半導体磁器コンデンサを提供することが可
能になる。[Table] As is clear from Tables 1 and 2, the composition according to the present invention has a dielectric breakdown voltage Vbd of 500
~800V, capacitance per unit area is 0.6~
A capacitor of 0.8 μF/cm 2 can be obtained. On the other hand, sample No. 2, 6, 20, 21, 23, 26, 27,
30, 31, 35, 36, and 39 cannot achieve the object of the present invention. Therefore, these are outside the scope of the present invention and are listed as comparative examples. Next, the reason for limiting the composition will be explained. When La is less than 1.0 mol%, the effect of adding La becomes too small and the capacitor's dielectric breakdown voltage Vbd
becomes lower than the target value. On the other hand, La is 4.0 mol%
When the amount is larger than , the dielectric constant of the surface dielectric layer 2 becomes low, and the capacitance C per unit area becomes smaller than the target value. Therefore, the preferred range of La is 1.0
~4.0 mol%. X (at least one of Ce, Pr, Nd, Sm, Y)
If the total amount of one or more types is less than 0.5 mol %, the effect of increasing the dielectric constant of the surface dielectric layer 2 cannot be sufficiently obtained, and the capacitance C becomes less than the target value. On the other hand, when X exceeds 3.0 mol%, the dielectric breakdown voltage Vbd becomes lower than the target value. Therefore, the preferred range of X is 0.5 to 3.0 mol%. BaTiO3 outside the range of 81.5-96.5 mol% and TiO2
When it is outside the range of 2.0 to 11.5 mol %, sinterability deteriorates, and capacitance C and dielectric breakdown voltage Vbd decrease. When Mn is less than 0.03 parts by weight, it becomes difficult to uniformly form the surface dielectric layer 2, and the dielectric breakdown voltage Vbd decreases. If the Mn content exceeds 0.30 parts by weight, it becomes difficult to form the surface dielectric layer 2 thinly, and the capacitance C cannot be increased while maintaining the dielectric breakdown voltage Vbd high. Therefore,
The preferred range of Mn is 0.03 to 0.30 parts by weight. Bi 2 O 3 is a component that improves sinterability, but this
If Bi 2 O 3 is less than 0.01 part by weight, hardly any improvement in sinterability can be expected, and improvements in capacitance C and dielectric breakdown voltage cannot be expected. When Bi 2 O 3 exceeds 0.20 parts by weight, the sinterability deteriorates.
Therefore, the preferred range of Bi 2 O 3 is 0.01 to 0.20 parts by weight. [Modifications] The present invention is not limited to the above-described embodiments, and, for example, the following modifications are possible. (1) MnO 2 may be used instead of MnCO 3 . (2) Temperature during firing (sintering) in oxidizing atmosphere
1260~1400℃, reducing atmosphere heat treatment temperature 900~1180℃, reoxidation treatment temperature 900~1100℃
It can be varied within a range of °C. (3) BaCO 3 and TiO 2 may be used as starting materials instead of BaTiO 3 . (4) The dielectric layer 2 under one of the electrodes 3, 4 can be omitted. [Effect of the invention] As described above, according to the present invention, the dielectric breakdown voltage is
500V or more, capacitance per unit area is 0.6μF/cm 2
It becomes possible to provide the above semiconductor ceramic capacitor.
図面は本発明の実施例に係わる磁器コンデンサ
を原理的に示す断面図である。
１……半導体磁器、２……表面誘電体層、３，
４……電極。
The drawing is a sectional view showing the principle of a ceramic capacitor according to an embodiment of the present invention. 1...Semiconductor ceramic, 2...Surface dielectric layer, 3,
4... Electrode.
Claims (1)
換算して0.03〜0.30重量部のMn化合物と、0.01〜
0.20重量部のBi2O3（酸化ビスマス）とから成り、 前記主成分が81.5〜96.5モル％のBaTiO3（チタ
ン酸バリウム）と、La（ランタン）に換算して1.0
〜4.0モル％のLa2O3（酸化ランタン）と、Ce（セ
リウム）、Pr（プラセオジム）、Nd（ネオジム）、
Sm（サマリウム）及びＹ（イツトリウム）の内の
少なくとも１種から成る希土類元素に換算して
0.5〜3.0モル％の前記希土類元素の酸化物と、2.0
〜11.5モル％のTiO2（酸化チタン）とから成るこ
とを特徴とする還元再酸化型半導体コンデンサ用
磁器組成物。 ２ 100重量部の主成分と、0.03〜0.30重量部の
Mnと、Bi2O3に換算して0.01〜0.20重量部のBiと
を含有している半導体磁器と、前記半導体磁器の
表面に形成された前記半導体磁器の酸化物から成
る誘電体層とから成り、 前記主成分が81.5〜96.5モル％のBaTiO3と、
1.0〜4.0モル％のLaと、0.5〜3.0モル％のＸ（但
し、ＸはCe，Pr，Nd，Sm及びＹの内の少なく
とも１種の希土類元素）と、TiO2に換算して2.0
〜11.5モル％のTiとを含むものであることを特徴
とする還元再酸化型半導体コンデンサ用磁器。[Claims] 1. 100.00 parts by weight of the main component, 0.03 to 0.30 parts by weight of Mn compound converted to Mn (manganese), and 0.01 to 0.30 parts by weight of the Mn compound.
It consists of 0.20 parts by weight of Bi 2 O 3 (bismuth oxide), the main components of which are 81.5 to 96.5 mol% of BaTiO 3 (barium titanate) and 1.0 parts by weight in terms of La (lanthanum).
~4.0 mol% La 2 O 3 (lanthanum oxide), Ce (cerium), Pr (praseodymium), Nd (neodymium),
In terms of rare earth elements consisting of at least one of Sm (samarium) and Y (yttrium)
0.5 to 3.0 mol% of the rare earth element oxide, and 2.0 mol%
A ceramic composition for a reduction and reoxidation type semiconductor capacitor, comprising ~11.5 mol% of TiO 2 (titanium oxide). 2 100 parts by weight of the main component and 0.03 to 0.30 parts by weight
A semiconductor ceramic containing Mn and 0.01 to 0.20 parts by weight of Bi calculated as Bi 2 O 3 , and a dielectric layer formed on the surface of the semiconductor ceramic and made of an oxide of the semiconductor ceramic. The main component is BaTiO 3 of 81.5 to 96.5 mol%,
1.0 to 4.0 mol% La, 0.5 to 3.0 mol%
Porcelain for reduction and reoxidation type semiconductor capacitors, characterized in that it contains ~11.5 mol% of Ti.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21697288A JPH0265209A (en) | 1988-08-31 | 1988-08-31 | Porcelain composition and porcelain for reduction reoxidation type semiconductor capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21697288A JPH0265209A (en) | 1988-08-31 | 1988-08-31 | Porcelain composition and porcelain for reduction reoxidation type semiconductor capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0265209A JPH0265209A (en) | 1990-03-05 |
| JPH0451964B2 true JPH0451964B2 (en) | 1992-08-20 |
Family
ID=16696805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21697288A Granted JPH0265209A (en) | 1988-08-31 | 1988-08-31 | Porcelain composition and porcelain for reduction reoxidation type semiconductor capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0265209A (en) |
-
1988
- 1988-08-31 JP JP21697288A patent/JPH0265209A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0265209A (en) | 1990-03-05 |
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