JPH0244243B2 - INALZN2O5DESHIMESARERUROTSUHOSHOKEINOSOJOKOZOOJUSURUKAGOBUTSUOYOBISONOSEIZOHO - 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 InAlZn ₂ O ₅ , which is a new compound useful as an optical functional material, a semiconductor material, and a catalyst material, and a method for producing the same. Conventional technology Conventionally, (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,
Corresponds to n = 1/2, In ³⁺ instead of Yb ³⁺ , Fe ³⁺
The present invention provides a novel compound obtained by replacing Al ³⁺ with Zn 2+ and Fe ²⁺ with Zn ²⁺ . Structure of the Invention The compound represented by InAlZn ₂ O ₅ of the present invention is described as In ³⁺ (Al ³⁺ , Zn ²⁺ )Zn ²⁺ O ₅ ^2- in the ionic crystal model, and its structure is composed of _1.5 layers of InO, (Al ³⁺ ,
It is formed by laminating Zn ²⁺ )O _2.5 layers and ZnO layers, and one of its characteristics is that it has significant structural anisotropy. Half of the Zn ²⁺ ions form a (Al ³⁺ , Zn ²⁺ ) ^O _2.5 layer with Al 3+, and the other half
Creating a ZnO layer. The lattice constants as a hexagonal crystal system are as follows. a = 3.295 ± 0.001 (Å) c = 22.56 ± 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 for optical functional materials, semiconductor materials, catalyst materials, etc.

【table】

[Table] This compound can be produced by the following method. Metal indium or indium oxide or a compound that decomposes into indium oxide when heated; metal aluminum or aluminum oxide or a compound that decomposes into aluminum oxide when heated; and metal zinc or zinc oxide or a compound that decomposes into zinc oxide when heated. of,
In, Al and Zn are mixed at an atomic ratio of 1:1:2, and the mixture is heated at a temperature of 600°C or higher,
It can be produced by heating in the air, an oxidizing atmosphere, or a reducing atmosphere in which In and Al are not reduced to a trivalent ion state, and Zn is 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 a small particle size, 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 needs to be such that the ratio of In, Al, and Zn is 1:1:2 in terms of atomic ratio. 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
600℃ in a reducing atmosphere where In and Al are not reduced from the trivalent ion state and Zn from the divalent ion state.
Heat under the above conditions. 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 InAlZn ₂ O ₅ compound powder was colorless and was found to have a crystalline structure by powder X-ray diffraction. Its crystal structure is layered,
It was found that it was formed by stacking _1.5 layers of InO, _2.5 layers of (Al, Zn)O, and a layer of ZnO. Example: Indium oxide (In ₂ O ₃ ) powder with a purity of 99.99% or more, aluminum oxide (Al ₂ O ₃ ) powder with a purity of 99.99% or more, and reagent grade zinc oxide (ZnO) powder in a 1:1 molar ratio. The mixture was weighed at a ratio of 4:4, 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. The mixture was sealed in a platinum tube, placed in a tubular siliconite furnace set at 1300°C, and heated for 3 days, and then the sample was taken out of the furnace and rapidly cooled to room temperature. The obtained sample had a single phase of InAlZn ₂ O ₅ , and the planar index (hkl), interplanar spacing (d _p ), and relative reflection intensity (I%) were measured by powder X-ray diffraction. The results were as shown in Table-2. The lattice constants as a hexagonal crystal system were a=3.295±0.001 (Å) and c=22.56±0.01 (Å). The above lattice constants and the surface index (hkl) in Table 2
The calculated interplanar spacing (d _c (Å)) agreed extremely well 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 InAlZn ₂ O ₅ . 2 Metallic indium or indium oxide or a compound that decomposes into indium oxide when heated; Metallic aluminum or aluminum oxide or a compound that decomposes into aluminum oxide when heated; Metallic zinc or zinc oxide or a compound that decomposes into zinc oxide when heated. and,
In, Al and Zn are mixed at an atomic ratio of 1:1:2, and the mixture is heated at a temperature of 600°C or higher,
A hexagonal layered structure represented by InAlZn ₂ O ₅ , which is heated in the air, an oxidizing atmosphere, or a reducing atmosphere in which In and Al are each in a trivalent ion state and Zn is not reduced in a divalent ion state. A method for producing a compound having a structure.