JPH0246523B2 - SCALZNMGO5DESHIMESARERUROTSUHOSHOKEINOSOJOKOZOOJUSURUKAGOBUTSUOYOBISONOSEIZOHO - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a compound having a hexagonal layered structure represented by ScAlZnMgO ₅ , which is a new compound useful as an optical functional material, a semiconductor material, and a catalyst, and a method for producing the same. Conventional technology Conventional (Yb ³⁺ Fe ³⁺ O ₃ ) _o Fe ²⁺ O (n indicates an integer)
The compound having a hexagonal layered structure represented by is synthesized by the applicant and is known. YbFe ₂ O ₄ , Yb ₂ Fe ₃ O ₇ , Yb ₃ Fe ₄ O ₁₀ and
Lattice constant of Yb ₄ Fe ₅ O ₁₃ as hexagonal system, YbO _1.5
Table 1 shows the number of layers in the unit cell, FeO _1.5 layer, and Fe ₂ O _2.5 layer. These compounds have a layered structure in which YbFeO ₃ is thought to be combined at a ratio of n moles (n=1, 2, 3...) per mole of iron oxide (FeO).

[Table] Purpose of the Invention The present invention is based on the chemical formula of (YbFeO ₃ ) _o FeO, where n=1/2 and Sc ³⁺ instead of Yb ³⁺ .
Al ³⁺ instead of Fe ³⁺ , (Zn ²⁺ instead of Fe ²⁺
+Mg ²⁺ ) is provided. Constitution of the Invention The compound represented by ScAlZnMgO ₅ of the present invention is
In the ionic crystal model, Sc ³⁺ (Al ³⁺ Zn ²⁺ )
Described as Mg ²⁺ O ₅ ^2- , its structure consists of _1.5 layers of ScO,
It is formed by laminating a (Al ³⁺ Zn ²⁺ )O _2.5 layer and a MgO layer, and one of its characteristics is that it has significant structural anisotropy. Zn ²⁺ forms the (Al ³⁺ , Zn ²⁺ O _2.5 layer) together with Al ³⁺ , and Mg ²⁺ forms the MgO layer. The lattice constant as a hexagonal system is as follows: a=3.249 ±0.001 (Å) c=21.88±0.01 (Å) Planar index (hkl), plane spacing (d (Å)) of this compound
(d _p is an actual measured value, d _c is a calculated value) and the relative reflection intensity (I (%)) for X-rays is shown in Table 2. This compound is useful as an optical functional material, a semiconductor material, and a catalyst material.

【table】

[Table] This compound can be produced by the following method. Scandium metal or scandium oxide or a compound that decomposes into scandium oxide when heated; Aluminum metal or aluminum oxide or a compound that decomposes into aluminum oxide when heated; Zinc metal or zinc oxide or a compound that decomposes into zinc oxide when heated. , metallic magnesium, magnesium oxide, or a compound that can be decomposed into magnesium oxide by heating are mixed in an atomic ratio of Sc, Al, Zn, and Mg in an atomic ratio of 1:1:1:1, and the mixture is heated at 600°C. It can be obtained by heating at the above temperature in the air, in an oxidizing atmosphere, or in a reducing atmosphere in which Sc and Al are not reduced to a trivalent ion state, and Zn and Mg are not reduced to a divalent ion state. Commercially available starting materials used in the present invention may be used as they are, but in order for the chemical reaction to proceed quickly, it is better to have small particles, especially 10 μm.
It is preferable that it is below. Further, when used as an optical functional material or a semiconductor material, it is preferable to have high purity since contamination with impurities is avoided. Examples of compounds whose starting materials yield metal oxides by heating include hydroxides, carbonates, and nitrates of the respective metals. The raw materials are thoroughly mixed as they are or together with alcohols, acetone, etc. The mixing ratio of the raw materials requires that the atomic ratio of Sc, Al, Zn, and Mg is 1:1:1:1. If this is removed, a single phase of the target compound cannot be obtained. This mixture is stored in the air, in an oxidizing atmosphere, or
Sc and Al are each in trivalent ion state, Zn and Mg
are heated at 600°C or higher in a reducing atmosphere in which they are not reduced from their respective divalent ion states. Heating time is several hours or more. There are no restrictions on the rate of temperature increase during heating. After heating, it can be rapidly cooled, or it can be rapidly drawn out into the atmosphere. The obtained powder of ScAlZnMgO ₅ compound was colorless, and powder X-ray diffraction revealed that it had a crystalline structure. It was found that the crystal structure is a layered structure, formed by stacking _1.5 layers of ScO, _2.5 layers of (Al, Zn)O, and a layer of MgO. Example Scandium oxide (Sc ₂ O ₃ ) with a purity of 99.99% or more
Powder, aluminum oxide (Al ₂ O ₃ ) powder with a purity of 99.9% or higher, reagent grade zinc oxide (ZnO), and reagent grade magnesium oxide (MgO) powder were weighed in a molar ratio of 1:1:2:2. Then, ethanol was added in an agate mortar and mixed for about 30 minutes to obtain a fine powder mixture with an average particle size of several μm. This mixture was sealed in a platinum tube, placed in a tubular siliconite furnace set at 1300°C, and heated for 3 days, after which the sample was taken out of the furnace and rapidly cooled to room temperature. The obtained sample was a single phase of _ScAlZnMgO5 , and the results of measuring the interplanar spacing (d _p ) and relative reflection intensity of each reflection by powder X-ray diffraction method are shown in Table-
It was as follows. The lattice constants as a hexagonal crystal system were as follows. a=3.249±0.001(Å) c=21.88±0.01(Å) The above lattice constants and each plane index (hkl) in Table 2
The calculated interplanar spacing (d _c (Å)) was in extremely good agreement with the actually measured interplanar spacing (d _p (Å)). Effects of the Invention The present invention provides novel compounds useful as optical functional materials, semiconductor materials, and catalysts.

Claims (1)

[Claims] 1. A compound having a hexagonal layered structure represented by ScAlZnMgO ₅ . 2 Scandium metal or scandium oxide or a compound that decomposes into scandium oxide when heated, aluminum metal or aluminum oxide or a compound that decomposes into aluminum oxide when heated, and zinc metal or zinc oxide or a compound that decomposes into zinc oxide when heated. and metallic magnesium, magnesium oxide, or a compound decomposed into magnesium oxide by heating, in an atomic ratio of Sc, Al, Zn, and Mg of 1:1:1:1, and the mixture was mixed with 600 At temperatures above ℃, in the air, in an oxidizing atmosphere, or when Sc and Al are each in the trivalent ion state, Zn
and heating in a reducing atmosphere in which Mg is not reduced beyond the divalent ion state.
A method for producing a compound having a hexagonal layered structure represented by _ScAlZnMgO5 .