JPS6041620B2 - Compound having hexagonal layered structure represented by YbGaCoO↓4 and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel compound YbGaCoO4 having a hexagonal layered structure and a method for producing the same.

Conventionally, YFe.

O. A compound having a hexagonal layered structure represented by
It was synthesized by the present applicants and its existence is already known. In this compound, as shown by Y31Fe""Fe゜゛OH-, the divalent ions and trivalent ions of iron are 5
Yttrium (Y) surrounded by coordinating oxygen ions
is a compound that has six-coordinated oxygen ions around it, and is magnetic. The present invention provides YY■
The present invention provides a novel compound in which Co21 is substituted for i31 and Fe21, and Ga゛ is substituted for Fe31, and a method for producing the same.

The compound represented by ``Phantom acoo4'' of the present invention is
In the compound, ytterbium exists as Yb゜゛ ion, gallium as Ga゜゛, cobalt as C♂゛, and Y
It can be expressed as b31Ga゜゛Co''゛oden-.

The result is 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 cobalt. Ga(5C
o is randomly distributed. Co divalent ion and G
The trivalent ion of a is 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 dense structure. s) and u
indicates the position within the unit cell. Planar index (hkl) and interplanar spacing (d(8)) of this crystal [do indicates actual measurement, dc indicates calculated value.

], relative reflection intensity for X-rays, I (%) are as shown in Table 1. The space group is Rm, the crystal habit is plate-like, and the lattice constant is as follows.

This compound is useful as a magnetic material, a semiconductor material, and a catalyst.

This compound can be produced by the following method.

Metal ytterbium (Yb) or ytterbium oxide (Y■03), or a compound that decomposes into ytterbium oxide (Yb2O3) when heated, and metal gallium, or gallium oxide (Ga2O3), or gallium oxide (Ga2O3), or a compound that decomposes into ytterbium oxide (Yb2O3) when heated. Gallium (Ga2O3
) and cobalt or cobalt oxide (COO), or a compound that produces cobalt oxide (COO) when heated, in an atomic ratio of 1:1:1 between ytterbium, gallium, and cobalt. At a temperature of 1100'C or higher, gallium and cobalt are each mixed in air, an oxidizing atmosphere, or
It can be produced by heating in a reducing atmosphere that does not reduce the valence ion state or the divalent ion state.

As the starting materials used in the present invention, commercially available ones may be used as they are, but in order to rapidly advance the chemical reaction between the starting materials, the particle size should be as small as possible, especially 10 μm.
It is preferable that it is below m.

Further, when used as a magnetic material or an electric material, since contamination with impurities is avoided, it is preferable that the starting material has a higher purity.

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

If this ratio is exceeded, the target compound cannot be obtained. This mixture is heated to a temperature of 1100 DEG C. or higher in air or in an oxidizing atmosphere or in a reducing atmosphere such that gallium and cobalt cannot be reduced from their trivalent and divalent ionic states. The heating time is one day or more. There are no restrictions on the rate of temperature increase during heating. After the reaction is completed, it is sufficient to rapidly cool it to 0°C or rapidly draw it out into the atmosphere. The obtained Y sphere AcO
The O4 compound exhibited a black color and was found to have a crystalline structure by powder X-ray diffraction. It was found that its crystal structure was the same as that of YFe2O4, which had already been obtained by the applicant. The weights of the starting mixed sample and reaction product samples were precisely weighed, and the stoichiometry of the resulting samples was determined. Examples Ytterbium oxide (Ybl,
O3) powder, gallium oxide (Ga
2O3) powder, and reagent grade cobalt oxide (COO
) The powder was weighed in a molar ratio of 1:1:2, and ethyl alcohol was added in a mortar and thoroughly mixed to obtain a fine powder with an average particle size of several μm.

The mixture was placed in a platinum crucible, placed in a box-shaped siliconite furnace set at 1350°C, and heated for 3 days, after which the sample was taken outside the furnace and rapidly cooled to room temperature. The obtained sample was YbGaCOO4, and it was confirmed by powder X-ray diffraction that it was crystallographically the same type as the previously reported YFe2O. 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 YbGaCOO4 crystal of the present invention.

Claims (1)

[Claims] 1 A compound having a hexagonal layered structure represented by YbGaCoO_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 metal cobalt (Co) or cobalt oxide (CoO), or a compound that decomposes into ytterbium oxide (Yb_2O_3) when heated. Compounds that are decomposed into cobalt (CoO) and gallium (Ga
) or by mixing gallium oxide or a compound that is decomposed by heating to produce gallium oxide (Ga_2O_3) such that the atomic ratio of ytterbium, cobalt, and gallium is 1:1:1.
Hexagonal YbGaCoO_4 characterized by heating in the air at a temperature of 0°C or higher in an oxidizing atmosphere or in a reducing atmosphere to the extent that gallium and cobalt 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.