JPS623020A - Production of ferrite - Google Patents
Production of ferriteInfo
- Publication number
- JPS623020A JPS623020A JP13883085A JP13883085A JPS623020A JP S623020 A JPS623020 A JP S623020A JP 13883085 A JP13883085 A JP 13883085A JP 13883085 A JP13883085 A JP 13883085A JP S623020 A JPS623020 A JP S623020A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- alkoxide
- solid solution
- iron
- mixed
- 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.)
- Granted
Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 150000004703 alkoxides Chemical class 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000006104 solid solution Substances 0.000 claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 28
- -1 iron alkoxide Chemical class 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052759 nickel Inorganic materials 0.000 abstract description 13
- 229910000708 MFe2O4 Inorganic materials 0.000 abstract description 5
- 229910021580 Cobalt(II) chloride Inorganic materials 0.000 abstract description 4
- NQNBVCBUOCNRFZ-UHFFFAOYSA-N nickel ferrite Chemical compound [Ni]=O.O=[Fe]O[Fe]=O NQNBVCBUOCNRFZ-UHFFFAOYSA-N 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 229910002518 CoFe2O4 Inorganic materials 0.000 abstract description 2
- 230000003301 hydrolyzing effect Effects 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 229910052700 potassium Inorganic materials 0.000 abstract description 2
- 239000000243 solution Substances 0.000 abstract description 2
- 229910021577 Iron(II) chloride Inorganic materials 0.000 abstract 1
- 229910003264 NiFe2O4 Inorganic materials 0.000 abstract 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 abstract 1
- 239000003513 alkali Substances 0.000 abstract 1
- 238000009835 boiling Methods 0.000 abstract 1
- 230000005587 bubbling Effects 0.000 abstract 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 abstract 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 229910017052 cobalt Inorganic materials 0.000 description 8
- 239000010941 cobalt Substances 0.000 description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Landscapes
- Compounds Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ＭＦｅ２Ｏ４（ただしＭはニッケルまたはコ
バルト等の鉄以外の２価の金ｆｉＪ、）なるフェライト
の製造方法に係り、特にその微粉末を得る方法に関する
。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for producing ferrite made of MFe2O4 (where M is divalent gold other than iron, such as nickel or cobalt), and particularly relates to a method for producing ferrite made of MFe2O4 (where M is divalent gold other than iron, such as nickel or cobalt), and in particular, the present invention relates to a method for producing ferrite made of MFe2O4 (where M is divalent gold other than iron such as nickel or cobalt). Regarding how to get .
（従来の技術）
従来のフェライトの製造方法は、２価の金属の酸化物と
３価の鉄の酸化物を粉末状態で混合して、例えば１３０
０℃〜１５００°Ｃに加熱して反応させることによるも
のであった。しかしこのような方法では、固体粒子の混
合物を反応させてフェライトを得ているので本質的に組
成が不均一となり、また、高温反応であるためにフェラ
イトの粒子径が大きく、かつ粒度分布も大きいために、
高性能、高信頼性の微細加工の可能な高寸法精度の材料
を製造することができなかった。また、従来方法による
と、原料となる酸化物を混合して高温で反応させた時に
、粒子どうしが接触している表面間の反応２拡故でしか
フェライト層が形成されず、粒子の深部は元のままであ
るので、均一性の高いフェライトを得るには、加熱反応
と粉砕の作業を繰り返さなければならない、このため、
製造に長時間を要する上、大がかりな粉砕装置が必要で
あり、かつ高温を保持するために大型の炉が必要となる
。さらに、粉砕と加熱を繰り返すため、異物混入が避け
られず、高純度のものを得にくいという欠点があった。(Prior Art) A conventional method for producing ferrite involves mixing an oxide of a divalent metal and an oxide of trivalent iron in a powder state, for example, 130
This was done by heating the reaction to 0°C to 1500°C. However, in this method, ferrite is obtained by reacting a mixture of solid particles, so the composition is essentially non-uniform.Also, because the reaction is performed at a high temperature, the ferrite particle size is large and the particle size distribution is also large. for,
It has not been possible to produce materials with high dimensional accuracy that allow for high performance, high reliability microfabrication. In addition, according to the conventional method, when the raw oxides are mixed and reacted at high temperature, the ferrite layer is only formed by reaction 2 spreading between the surfaces where the particles are in contact, and the deep part of the particles is To obtain ferrite with high uniformity, the heating reaction and crushing operations must be repeated, as it remains intact.
It takes a long time to manufacture, requires large-scale crushing equipment, and requires a large furnace to maintain high temperatures. Furthermore, since pulverization and heating are repeated, contamination with foreign matter is inevitable, making it difficult to obtain a product of high purity.
（発明が解決しようとする問題点）
本発明は、このような欠点に鑑み、液相における低温反
応によって製造可能であって、反応に大がかりな装置を
要せず、分子サイズの微粒子で高純度の例えばＮｉ、Ｃ
ｏの如き２価の金属のフェライトを製造する方法を提供
することを目的としてなされたものである。(Problems to be Solved by the Invention) In view of these drawbacks, the present invention aims to produce high-purity particles of molecular size, which can be produced by low-temperature reaction in a liquid phase, and does not require large-scale equipment for the reaction. For example, Ni, C
The purpose of this invention is to provide a method for manufacturing divalent metal ferrite such as ferrite.
（問題点を解決するための手段）
本発明のＮｉ、Ｃｏの如き２価の金属のフェライトの製
造方法は、鉄と鉄以外の２価の金属Ｍ（例えばニッケル
またはコバルト）との混合アルコキシドを作り、該混合
アルコキシドの加水分解を行うことにより、鉄と前記金
属の水酸化物の固溶体を作り、該固溶体が混入している
液中に酸素または酸素を含む気体を送給することにより
、ＭＦｅ２Ｏ４なるフェライトを得ることを特徴とする
。(Means for Solving the Problems) The method for producing ferrite of divalent metals such as Ni and Co of the present invention uses a mixed alkoxide of iron and a divalent metal M other than iron (for example, nickel or cobalt). MFe2O4 is produced by producing a solid solution of iron and the hydroxide of the metal by hydrolyzing the mixed alkoxide, and by supplying oxygen or a gas containing oxygen into the liquid containing the solid solution. It is characterized by obtaining ferrite.
本発明において、ＦｅとＦｅ以外のＮｉまたはＣＯの如
き２価の金属の各アルコキシドを生成させる場合、これ
、らを同時にまたは別々に生成させる０本発明にて用い
られる出発物質としてのＦｅおよびＮｉ、Ｇｏの如き２
価の金属の化合物には、塩化物等のハロゲン化物がある
。また、アルコキシドを作るアルコールとしては、メタ
ノール、エタノール（ＥｔＯＨ）、ブタノール等が用い
られる。In the present invention, when Fe and each alkoxide of a divalent metal such as Ni or CO other than Fe are produced, these are produced simultaneously or separately.Fe and Ni as starting materials used in the present invention , Go like 2
Compounds of valent metals include halides such as chlorides. Further, as the alcohol for forming the alkoxide, methanol, ethanol (EtOH), butanol, etc. are used.
以下、本発明を実験例により説明する。The present invention will be explained below using experimental examples.
（実験例１） 以下の方法で、コバルトフェライトの合成を行なった。(Experiment example 1) Cobalt ferrite was synthesized using the following method.
まず、２００℃で３時間加熱処理して付着水を除去した
塩化鉄（ＦｅＣＪ１２）と塩化コバルト（ＣＯＣＪ１２
）とを準備し、Ｆｅ：Ｃｏ＝２：１となるように、０．
０４モルのＦｅ０文２と０．０２モルのＣｏＣ１ｔとを
エタノール（ＥｔＯＨ）２００ｍｌに溶解させ、約６５
℃〜７０℃で１時間、０．２立／■ｉｎの流量でＮ２ガ
スを通じながら還流（加熱により生じた溶媒の蒸気を冷
却し液化し、溶液中に戻す処理）し、塩化鉄と塩化コバ
ルトをエタノールに完全に溶解させた。First, iron chloride (FeCJ12) and cobalt chloride (COCJ12) were heated at 200°C for 3 hours to remove attached water.
), and 0.
0.04 mol of Fe02 and 0.02 mol of CoC1t are dissolved in 200 ml of ethanol (EtOH), and about 65 mol of
Reflux (process to cool and liquefy the solvent vapor generated by heating and return it to the solution) at a temperature of ℃ to 70℃ for 1 hour while passing N2 gas at a flow rate of 0.2 cubic centimeters/inch to remove iron chloride and cobalt chloride. was completely dissolved in ethanol.
次にこの溶液に化学量論比のＮａ（なおこの代わりにＮ
ａ０Ｅｔを用いてもよい）を加え、Ｎ２ガス雰囲気下で
１時間、約６５〜７０℃で還流し、下記の置換反応を行
わせた。Next, add a stoichiometric amount of Na (instead of N
a0Et may be used) and refluxed at about 65 to 70° C. for 1 hour under a N2 gas atmosphere to carry out the following substitution reaction.
Ｆ ｅ Ｃｌ ２ ＋ ２ Ｅ ｔ ＯＮ ａ−Ｆｅ
（ＯＥｔ）２ ＋２ＮａＣｆＬ・・・（１）ＣｏＣｌ２
＋２ＥｔＯＮａ
−”Ｃｏ （ＯＥｔ）２ ＋２ＮａＣＪ１−１２）なお
、上述の反応をＮ２ガスの雰囲気で行なうのは、Ｆｅ（
ＯＥｔ）２やＧｏ（ＯＥｔ）２が非常に酸化されやすく
、本発明の最終生成物が得られなくなるからである。従
って無酸素雰囲気を形成できるものであれば、Ｎ２ガス
以外の他の不活性ガスを用いることができる。また、Ｎ
ａはアルコキシドを生成させる反応を進行させるために
用いるもので、この代わりにＬｉやＫを用いることもで
きる。F e Cl 2 + 2 E t ON a-Fe
(OEt)2 +2NaCfL... (1) CoCl2
+2EtONa −”Co (OEt)2 +2NaCJ1-12) Note that the above reaction is carried out in an N2 gas atmosphere because Fe(
This is because OEt)2 and Go(OEt)2 are very easily oxidized, making it impossible to obtain the final product of the present invention. Therefore, any inert gas other than N2 gas can be used as long as it can form an oxygen-free atmosphere. Also, N
a is used to advance the reaction to produce an alkoxide, and Li or K can also be used instead.
次に１００ｍＪＬの煮沸水を加え、Ｎ２ガス雰囲気下約
６５〜７０℃で１時間還流することにより加水分解を行
なった後、Ｎ２ガスの代わりに０１２１〜２交／ｗｉｎ
の流量で空気を流し、温度を４０℃〜８０℃、時間を１
時間〜２０時間に変化させて空気酸化を行った。そして
この生成物を遠心分離後、真空乾燥した。Next, 100 mJL of boiled water was added and refluxed for 1 hour at about 65-70°C under N2 gas atmosphere to perform hydrolysis.
Flow the air at a flow rate of 40°C to 80°C for 1 hour.
Air oxidation was performed at varying times of 20 to 20 hours. This product was centrifuged and then vacuum dried.
生成物の空気中酸化の温度、時間を変化させた各生成物
のＸ線回析の結果、２立／■ｉｎの流量の場合には、空
気酸化の温度が４０℃〜６０℃で酸化時間が１〜３時間
の場合にはＣｏＦｅ２０ａと（Ｆｅ 、Ｃｏ）ＯＯＨと
の回折パターンであった。酸化温度が６０℃〜８０℃の
条件においては、１時間以上の酸化時間で格子定数に基
づく判断から、主生成物がＣｏＦｅ２Ｏ４であることが
確認されたが、約５時間で格子定数が飽和することから
、酸化条件は、温度が６０℃〜８０℃で酸化時間５時間
以上が最適であると考えられる。また、上述のプロセス
により得られる生成物を電子顕微鏡により観察したとこ
ろ、粒径がｏ、ｏｉ〜０、ｌｐｍ程度の微細な粒子が生
成していることが確認された。As a result of X-ray diffraction of each product by changing the temperature and time of oxidation in the air of the product, in the case of a flow rate of 2 cubic centimeters/inch, the oxidation time was When the time was 1 to 3 hours, the diffraction pattern was that of CoFe20a and (Fe,Co)OOH. Under conditions where the oxidation temperature was 60°C to 80°C, it was confirmed that the main product was CoFe2O4 based on judgment based on the lattice constant after an oxidation time of 1 hour or more, but the lattice constant was saturated in about 5 hours. Therefore, it is considered that the optimum oxidation conditions are a temperature of 60° C. to 80° C. and an oxidation time of 5 hours or more. Further, when the product obtained by the above-mentioned process was observed using an electron microscope, it was confirmed that fine particles having a particle size of about o, oi to 0, lpm were produced.
（実験例２）
ニッケルフェライトの合成は、前記コバルトフェライト
の合成工程におけるＣｏＣｌ２の代わりにＮ１ＣＱ２を
用い、同様の工程で行なった。(Experimental Example 2) Nickel ferrite was synthesized in the same process as in the cobalt ferrite synthesis process, except that N1CQ2 was used instead of CoCl2.
その結果、コバルトフェライトの場合と同様に、温度が
６０℃〜８０℃、酸化時間５時間以上を最適条件として
粒径が０．０１〜０．１ｐｍ程度の微細な粒子が得られ
た。As a result, as in the case of cobalt ferrite, fine particles with a particle size of about 0.01 to 0.1 pm were obtained under the optimum conditions of a temperature of 60° C. to 80° C. and an oxidation time of 5 hours or more.
なお本発明は、鉄アルコキシドに、鉄以外の２価の金属
の金属アルコキシドを２種以上混合した混合アルコキシ
ドから加水分解により固溶体を造り、例えばＣＯＸ Ｎ
ｉ １−ＸＦ ｅ２０４の如きフェライトをも製造し
得るものである。In addition, in the present invention, a solid solution is prepared by hydrolysis from a mixed alkoxide obtained by mixing an iron alkoxide with two or more metal alkoxides of divalent metals other than iron, for example, COX N.
It is also possible to produce ferrites such as i1-XF e204.
（発明の効果）
以上述べたように、本発明の方法は、アルカリ金属の置
換反応と加水分解と気中等の酸化雰囲気での酸化とを利
用してニッケルフェライトまたはコバルトフェライト等
の２価の金属フェライトを得る方法であり、均一な組成
のａ微細粉粒を得ことができる。従って、本発明によれ
ば、高純度、高性能で高信頼性のフェライトが得られる
。また、本発明によれば、粉砕や従来のような高温での
加熱が不要になることから、これらの大がかりな装置が
不要になり、しかも作業の繰返し、が不要になるので、
製造時間が短縮される。また本発明によれば、焼成プロ
セスを用いなくとも結晶質のフェライトを得ることも可
能となるので、磁気テープのような高分子材料との複合
化によって焼成プロセス（炉）を使わずに製品を得るこ
とも可能となる。(Effects of the Invention) As described above, the method of the present invention utilizes an alkali metal substitution reaction, hydrolysis, and oxidation in an oxidizing atmosphere such as air to produce a divalent metal such as nickel ferrite or cobalt ferrite. This is a method for obtaining ferrite, and it is possible to obtain a-fine powder particles with a uniform composition. Therefore, according to the present invention, ferrite with high purity, high performance, and high reliability can be obtained. In addition, according to the present invention, there is no need for pulverization or heating at high temperatures as in the conventional method, which eliminates the need for these large-scale devices and also eliminates the need for repeated operations.
Manufacturing time is reduced. Furthermore, according to the present invention, it is possible to obtain crystalline ferrite without using a firing process, so by combining it with a polymeric material such as magnetic tape, products can be produced without using a firing process (furnace). It is also possible to obtain
Claims (1)
ルコキシドとの混合物を加水分解して鉄と前記金属の水
酸化物の固溶体を作り、該固溶体が混入している液中に
酸素または酸素を含むガスを送給することにより、ＭＦ
ｅ＿２Ｏ＿４なるフェライトを得ることを特徴とするフ
ェライトの製造方法。A mixture of a divalent iron alkoxide and a metal alkoxide of a divalent metal other than iron is hydrolyzed to produce a solid solution of iron and the hydroxide of the metal, and oxygen or By supplying gas containing oxygen, MF
A method for producing ferrite, characterized by obtaining ferrite e_2O_4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13883085A JPS623020A (en) | 1985-06-25 | 1985-06-25 | Production of ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13883085A JPS623020A (en) | 1985-06-25 | 1985-06-25 | Production of ferrite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS623020A true JPS623020A (en) | 1987-01-09 |
| JPH0371377B2 JPH0371377B2 (en) | 1991-11-13 |
Family
ID=15231216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13883085A Granted JPS623020A (en) | 1985-06-25 | 1985-06-25 | Production of ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS623020A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58199724A (en) * | 1982-05-17 | 1983-11-21 | Sentan Kako Kikai Gijutsu Shinko Kyokai | Manufacture of ferrite |
| JPS6054924A (en) * | 1983-09-02 | 1985-03-29 | Sentan Kako Kikai Gijutsu Shinko Kyokai | Production of manganese ferrite |
| JPS61117117A (en) * | 1984-11-13 | 1986-06-04 | Sentan Kako Kikai Gijutsu Shinko Kyokai | Synthesis of m3o4 type compound and solid solution |
-
1985
- 1985-06-25 JP JP13883085A patent/JPS623020A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58199724A (en) * | 1982-05-17 | 1983-11-21 | Sentan Kako Kikai Gijutsu Shinko Kyokai | Manufacture of ferrite |
| JPS6054924A (en) * | 1983-09-02 | 1985-03-29 | Sentan Kako Kikai Gijutsu Shinko Kyokai | Production of manganese ferrite |
| JPS61117117A (en) * | 1984-11-13 | 1986-06-04 | Sentan Kako Kikai Gijutsu Shinko Kyokai | Synthesis of m3o4 type compound and solid solution |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0371377B2 (en) | 1991-11-13 |
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