JPS5943416B2 - Compound having hexagonal layered structure represented by YbFeZnO↓4 and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel compound YbFeZn0l having a hexagonal layered structure and a method for producing the same.

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

In this compound, the divalent and trivalent ions of iron are surrounded by five-coordinated oxygen ions, and yttrium Y is surrounded by six-coordinated oxygen It is a compound that has ions surrounding it and is magnetic. The present invention provides the above-mentioned Y3YFe奸Fe奸04
The object of the present invention is to provide a novel compound in which Zn is substituted for Yb, Fe''Y in place of Y in the compound, and a method for producing the same.

In the compound represented by YbFeZn04 of the present invention, iron is Fe3f ion, ytterbium is Yb
Zinc exists as Zn, Yb1Fe Z.
It can be expressed as n奸042-.

This crystal has a hexagonal layered structure as shown in FIG. The largest circle is oxygen, the middle circle is Yb) The smallest black circle is Fe
and Zn. Fe and Zn are randomly distributed. The divalent ions of zinc and the trivalent ions of iron are surrounded by five-coordinated oxygen ions. Crystallographically, they occupy the same position. Moreover, Yb has hexacoordinated oxygen around it. Oxygen, an anion, has a dense structure. s, and u indicate the position within the unit cell. Planar index hkL plane spacing dlA) of this crystal [do indicates actual measurement, dc indicates calculated value.

], relative reflection intensity for X-rays) are as shown in Table 1. The space group is R+n), its crystal habit is plate-like, and its 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.

Metallic ytterbium Yb or ytterbium oxide Y
b2O3 or a compound that decomposes into ytterbium oxide Yb, O3 when heated, metallic iron or iron oxide Fe2O3, or a compound that decomposes into iron oxide Fe2O3 when heated and zinc or zinc oxide ZnO Or a compound that is decomposed by heating to produce zinc oxide ZnO, such as ytterbium,
Iron and zinc are mixed in an atomic ratio of 1:1:1, and at a temperature of 1000°C or higher, iron and zinc are dissolved in the air, in an oxidizing atmosphere, or in a trivalent ion state and a divalent ion state, respectively. It can be produced by heating in a reducing atmosphere that is less reducing.

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 the atomic ratio of itterbium, iron, and zinc.
The ratio is 1:1:1.

If this ratio is exceeded, the target compound cannot be obtained. This mixture is heated in air or in an oxidizing atmosphere or in a reducing atmosphere such that iron and zinc cannot be reduced from their trivalent and divalent ion states.
Heating at a temperature of 000°C or higher. 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 may be rapidly cooled to 0°C or rapidly drawn out into the atmosphere. The obtained YbFeZnO4 compound exhibited a brown 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.
Precisely weigh the sample weights of the starting mixed sample and reaction product,
The stoichiometric number of the obtained sample was determined. Example Ytterbium oxide Yb2O3 with purity of 99.9% or more
Powder, oxidized Fe2O3 powder with purity of 99.9% or higher,}
and reagent grade zinc oxide ZnO powder in a 1:1 molar ratio.
The mixture was weighed at a ratio of 1:1, 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 1309°C, and heated for 4 days.
Thereafter, the sample was taken out of the furnace and rapidly cooled to room temperature. The obtained sample was YbFeZnO4, and it was confirmed by powder X-ray diffraction that it was crystallographically the same type as the previously reported YFe2O4. 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 drawings]

The drawing is a diagram of the YbFeZnO4 crystal of the present invention.

Claims (1)

[Claims] 1 A compound having a hexagonal layered structure represented by YbFeZnO_4. 2 metal ytterbium Yb or ytterbium oxide Yb_2O_3, or a compound that is decomposed into ytterbium oxide Yb_2O_3 by heating;
Metallic iron Fe or iron oxide Fe_2O_3 or a compound that is decomposed into iron oxide Fe_2O_3 by heating, and zinc Zn or zinc oxide ZnO or
A compound that is decomposed by heating to produce zinc oxide (ZnO) is mixed with ytterbium, iron, and zinc in an atomic ratio of 1:1:1, and the mixture is heated in the atmosphere at a temperature of 1000°C or higher. Y characterized by heating in an oxidizing atmosphere or a reducing atmosphere to the extent that iron and zinc are not reduced from their respective trivalent ion and divalent ion states.
A method for producing a compound having a hexagonal layered structure represented by bFeZnO_4.