JPH0348135B2 - - 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 LuGaZn ₄ O ₇ , 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. Prior Art Conventionally, a compound having a hexagonal layered structure represented by (Yb ³⁺ Fe ³⁺ O ₃ ) _o Fe ²⁺ O (n represents an integer) was synthesized by the applicant and was known. There is. 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 are per mole of iron oxide,
It is a compound with a layered structure that is thought to be composed of n moles of YbFeO ₃ .

[Table] Purpose of the invention The present invention is based on the chemical formula of (YbFeO ₃ ) _o FeO,
Corresponds to n = 1/4, Lu ³⁺ instead of Yb ³⁺ , Fe ³⁺
The present invention provides a novel compound obtained by replacing Ga ³⁺ with Zn 2+ and Fe ²⁺ with Zn ²⁺ . Structure of the Invention The compound represented by LuGaZn ₄ O ₇ of the present invention is Lu ³⁺ (Ga ³⁺ , Zn ²⁺ ) in the ionic crystal model.
Described as Zn ₃ ²⁺ O ₇ ^2- , its structure consists of _1.5 layers of LuO,
It is formed by laminating a (Ga ³⁺ , Zn ²⁺ )O _2.5 layer and a ZnO layer, and one of its characteristics is that it has significant structural anisotropy. 1/4 of the number of Zn ²⁺ ions is
Together with Ga ^{3+ ,} (Ga ³⁺ , Zn ²⁺ ) forms an O _2.5 layer, and the remaining 3/4 forms a ZnO layer. The lattice constants as a hexagonal crystal system are as follows. a = 3.328 ± 0.001 (Å) c = 32.45 ± 0.01 (Å) Planar index (hkl), interplanar spacing (d (Å)),
[d _p is an actual measurement value, d _c is a calculated value] and the relative reflection intensity (%) for X-rays is shown in Table 2. This compound is useful for optical functional materials, semiconductor materials, catalyst materials, etc.

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[Table] This compound can be produced by the following method. Metallic lutetium or lutetium oxide or a compound that is decomposed into lutetium oxide by heating; Metallic gallium or gallium oxide or a compound that is decomposed into gallium oxide by heating;
Metallic zinc or zinc oxide or a compound that is decomposed into zinc oxide by heating is
Mixing Zn at an atomic ratio of 1:1:4,
It can be produced by heating the mixture at a temperature of 650° C. or higher in the air, in an oxidizing atmosphere, or in a reducing atmosphere in which Lu and Ga are not reduced to a trivalent ion state and Zn is not reduced to a divalent ion state. It will be done. 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. Furthermore, 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 is or together with alcohols, acetone, etc. The mixing ratio of the raw materials needs to be such that the ratio of Lu, Ga, and Zn is 1:1:4 in 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
650℃ in a reducing atmosphere where Lu and Ga 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 LuGaZn ₄ O ₇ compound powder was colorless and was found to have a crystal structure by powder X-ray diffraction. Its crystal structure is layered,
It was found that it was formed by stacking _1.5 layers of LuO, _2.5 layers of (Ga, Zn)O, and a layer of ZnO. Example Lutetium oxide (Lu ₂ O ₃ ) with a purity of 99.99% or more
Powder, gallium oxide (Ga ₂ O ₃ ) with a purity of over 99.99%
Weigh powder and reagent grade zinc oxide (ZnO) powder at a molar ratio of 1:1:8, add ethanol in an agate mortar, and mix for about 30 minutes to form a fine powder mixture with an average particle size of several μm. I got it. This mixture was sealed in a platinum tube, placed in a tubular siliconite furnace set at 1450°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 had a single phase of LuGaZn ₄ O ₇ . Planar index (hkl), planar spacing ( _dp ) by powder X-ray diffraction method
and relative reflection intensity (%) were measured. The results were as shown in Table-2. The lattice constants as a hexagonal crystal system were a=3.328±0.001 (Å) and c=32.45±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 LuGaZn ₄ O ₇ . 2 Metallic lutetium or lutetium oxide or a compound that is decomposed into lutetium oxide by heating; Metallic gallium or gallium oxide or a compound that is decomposed into gallium oxide by heating; and Metallic zinc or zinc oxide or a compound that is decomposed into zinc oxide by heating. and Lu, Ga, and Zn in an atomic ratio of 1:1:4, and the mixture is heated at a temperature of 650°C or higher in the air, in an oxidizing atmosphere, or with trivalent ions of Lu and Ga, respectively. state, characterized by heating in a reducing atmosphere in which Zn is less reduced than the divalent ion state.
A method for producing a compound having a hexagonal layered structure represented by LuGaZn ₄ O ₇ .