JPS606895B2 - Compound having hexagonal layered structure represented by YbGaZnO↓4 and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel compound YbGaZn04 having a hexagonal layered structure and its production.

Conventionally, a compound having a hexagonal layered structure represented by YFe204 was synthesized by the present applicant, and its existence is already known.

In this compound, the divalent and trivalent ions of iron are surrounded by five-coordinated oxygen ions, and the yttrium (Y) is
It is a compound that has coordinating oxygen ions around it and is magnetic. The present invention provides a novel compound in which Y30 is replaced with Y30, Yb30 is replaced with Y30, Zn20 is replaced with Fe20, and Ga30 is replaced with Fe30 in the Fe30042-compound, and its production. It is in providing the law.

In the compound represented by YbGaZn04 of the present invention, ytterbium is present as Yb30 ion, gallium is present as Ga30, zinc is present as Z〆0, and Y is present as Yb30 ion.
It can be expressed as a3 size Zn2042-.

This crystal has a hexagonal layered structure as shown in FIG. The largest circle indicates oxygen, the middle circle indicates ytterbium, and the smallest black circle indicates gallium and zinc. Gallium and zinc are randomly distributed. The divalent ions of zinc and the trivalent ions of gallium are surrounded by five-coordinated oxygen ions. Crystallographically, they occupy the same position. Also Y
b has 6-coordinated oxygen around it. Oxygen, an anion, has a delicate structure. s, t and u indicate positions within the unit cell. Area number of this crystal (h
kD, surface spacing (d(A)) [do is actually measured, dc is calculated value. ], the relative reflection intensity with respect to the x-ray, 1 (%), is as shown in Table 1. The space group in Table 1 is Rim, its crystal habit is plate-like, and its lattice constant is as follows.

ao=3.4153±0.0005
(A) Co=25.093±0.007
(A) This compound is useful as a semiconductor material and a catalyst.

This compound can be produced by the following method.

Metallic ytterbium (Yb) or ytterbium oxide (YQ03) or a compound that decomposes into ytterbium oxide (YQ03) by heating and metallic gallium, or gallium oxide (Ga203), or gallium oxide (Ga203) by heating
Compounds that are decomposed into zinc or zinc oxide (Zn○)
If < is decomposed by heating and becomes zinc oxide (Z
ytterbium, gallium, and zinc in an atomic ratio of 1 to 1 to 1. Each zinc is in a trivalent ion state,
It can be produced by heating in a reducing atmosphere that does not reduce the divalent ion state.

Commercially available starting materials used in the present invention may be used as they are, but in order to rapidly advance the chemical reaction between the starting materials, the smaller the particle size, the better.
It is preferable that it is below m.

Furthermore, when used as a semiconductor material or catalyst, the higher the purity of the starting material, the more preferable it is, since contamination with impurities is to be avoided.

This raw material is thoroughly mixed as is or with alcohol or acetone. The mixing ratio of these is such that the ratio of ioterbium, gallium, and zinc is 1 as an atomic ratio.
The ratio is 1:1.

If this ratio is exceeded, the target compound cannot be obtained. This mixture is heated to a temperature of 1200 oo or more in air or under an oxidizing atmosphere or a reducing atmosphere such that gallium and zinc cannot be reduced from their trivalent and divalent ionic states. Heating time is 1
days or more. There are no restrictions on the rate of temperature increase during heating. After the reaction is completed, it may be rapidly cooled to 0°C or rapidly drawn out into the atmosphere. The obtained YoGaZn0
The four compounds were colorless and were found to have a crystalline structure by powder X-ray diffraction.

The crystal structure was found to be the same as that of YFe204 already obtained by the applicant. The weights of the starting mixed sample and the reaction product were precisely weighed, and the stoichiometry of the resulting sample was determined. Example: Ytterbium oxide (YQ03) with a purity of 99.9% or more
) powder, gallium oxide (Ga20
3) Weigh out the powder and reagent grade zinc oxide (Zn○) powder at a molar ratio of 1:1:2, add ethyl alcohol in a floating pot and mix thoroughly to obtain an average particle size of A fine powder of kite was obtained.

The mixture was filled in a platinum rubbo and placed in a box-shaped siliconite furnace set at 130,000 ℃ and heated for 2 days, after which the sample was taken out of the furnace and rapidly cooled to room temperature. The obtained sample was YbGaZn04, and it was confirmed by powder X-ray diffraction that it was crystallographically the same type as the previously reported YFe204. The weight of the sample was precisely weighed before and after heating, and the stoichiometry of the resulting sample was determined. Table 1 shows the crystallographic properties of the samples obtained.

[Brief explanation of the drawing]

The drawing is a diagram of the YbGaZn04 crystal of the present invention. The largest circle indicates oxygen, the middle circle indicates ytterbium, and the smallest black circle indicates gallium and zinc. misfortune of duty

Claims (1)

[Claims] 1. A compound having a hexagonal layered structure represented by YbGaZnO_4. 2 Metallic ytterbium (Yb) or ytterbium oxide (Yb_2O_3), or a compound that decomposes into ytterbium oxide (Yb_2O_3) when heated, and metallic gallium (Ga) or gallium oxide (Ga_2O_3) or a compound that is heated. a compound which is decomposed into gallium oxide (Ga_2O_3) and zinc (Zn) or zinc oxide (ZnO) or
A compound that is decomposed by heating to produce zinc oxide (ZnO) is mixed with ytterbium, gallium, and zinc in an atomic ratio of 1:1:1 to produce 12
Hexagonal YbGaZnO_4 characterized by heating in the air at a temperature of 00°C or higher in an oxidizing atmosphere or in a reducing atmosphere to the extent that gallium and zinc are not reduced to a trivalent ion state or a divalent ion state, respectively. A method for producing a compound having a crystalline layered structure.