JPH0248487B2 - YBALZN9O12DESHIMESARERUROTSUHOSHOKEINOSOJOKOZOOJUSURUKAGOBUTSUOYOBISONOSEIZOHO - 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 YbAlZn ₉ O ₁₂ , 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, Fe ₂ O _2.5 layer. These compounds have a layered structure in which YbFeO ₃ is 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,
Corresponding to n = 1/9, Al ³⁺ instead of Fe ³⁺ ,
The object of the present invention is to provide a novel compound obtained by replacing Fe ²⁺ with Zn ²⁺ . Structure of the Invention In the ionic crystal model, the compound represented by YbAlZn ₉ O ₁₂ of the present invention is Yb ³⁺ (Al ³⁺ Zn ²⁺ )
Described as Zn ₈ ²⁺ O ₁₂ ^2- , its structure is YbO _1.5
It is formed by stacking a layer, an (Al ³⁺ Zn ²⁺ )O _2.5 layer, and a ZnO layer, and one of its characteristics is that it has significant structural anisotropy. 1/ of Zn ²⁺
9 forms ^{a (Al 3+ ,} Zn ²⁺ )O _2.5 layer together with Al 3+, and the remaining 8/9 forms a ZnO layer. The lattice constants as a hexagonal crystal system are as follows. a=3.280±0.001 (Å) c=87.11±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 (%) for X-rays is as shown in Table 2. This compound is useful for optical functional materials, semiconductor materials, catalyst materials, and the like.

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[Table] This compound can be produced by the following method. metal ytterbium or ytterbium oxide or a compound that decomposes into ytterbium oxide when heated; metal aluminum or aluminum oxide or a compound that decomposes into aluminum oxide when heated; metal zinc or zinc oxide or a compound that decomposes into zinc oxide when heated. A compound containing Yb, Al, and Zn in an atomic ratio of 1:1:9 is mixed with a compound containing Yb, Al, and Zn in an atomic ratio of 1:1:9. Zn in a valent ion state can be produced by heating in a reducing atmosphere where Zn is not reduced more than in a divalent ion state. Commercially available starting materials 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 desirable 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 ratio of Yb, Al, and Zn be in an atomic ratio of 1:1:9. 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
Yb and Al are each in a trivalent ion state, and Zn is each in a 2-valent state.
In a reducing atmosphere that does not reduce from the valent ion state
Heat at 650℃ or higher. 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 YbAlZn ₉ O ₁₂ 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 YbO, _2.5 layers of (Al, Zn)O, and a layer of ZnO. Example: Ytterbium oxide (Yb 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 18:1, 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 1450°C, and heated for 4 days.
Thereafter, the sample was taken out of the furnace and rapidly cooled to room temperature. The obtained sample is YbAlZn ₉ O ₁₂ single phase,
The results of measuring the plane index (hkl), plane spacing (d _p ), and relative reflection intensity by powder X-ray diffraction are shown in Table-
2 was true. The lattice constants as a hexagonal crystal system were a=3.280±0.001 (Å) and c=87.11±0.01 (Å). The above lattice constants and the surface 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 YbAlZn ₉ O ₁₂ . 2 Metallic ytterbium or yzterbium oxide or a compound that decomposes into ytterbium 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. The ratio of Yb, Al and Zn to the compound to be used is 1 in atomic ratio.
Mix at a ratio of 1:9 to
A method for producing a compound having a hexagonal layered structure represented by YbAlZn ₉ O ₁₂ , which comprises heating in a reducing atmosphere in which Al and Zn are not reduced in a trivalent ion state and Zn in a divalent ion state.