JPS5943417B2 - Compound having hexagonal layered structure represented by LuFeCuO↓4 and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel compound, LuFeCu04, 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.

This compound is Y3+Fe2+Fe3+O; As shown by 1, divalent and trivalent iron ions are surrounded by five-coordinated oxygen ions, and yttrium cup has six-coordinated oxygen ions surrounding them. It is a compound that has magnetic properties. The present invention provides the above-mentioned Y゜+Fe''+Fe
゜+04'' Instead of one compound Y3+, Lu3+, F
The object of the present invention is to provide a novel compound in which Cu2+ is substituted for e2+, and a method for producing the same.

In the compound represented by LuFeCu04 of the present invention, iron is Fe3+ ion, lutetium is Lu3+,
Copper exists as Cu2+, Lu3+Fe3+C
It can be expressed as u2+'042-.

This crystal has a hexagonal layered structure as shown in FIG. The largest circle is oxygen, the middle circle is Lu, and the smallest black circle is F.
e and Cu are shown. Fe and Cu are randomly distributed. Divalent ions of copper and trivalent ions of iron are surrounded by five-coordinated oxygen ions. Crystallographically, they occupy the same position. Moreover, Lu has six-coordinated oxygen surrounding it. Oxygen, an anion, has a dense structure. s, and u indicate the position within the unit cell. Planar index (hkl) and interplanar spacing (d(A)) of this crystal
[do indicates the real side, dc indicates the calculated value.

], the relative reflection intensity for X-rays I completed) are as shown in Table 1. Is the space group R? The crystal habit is tabbuse crystal, 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.

Lutetium metal (Lu) or lutetium oxide (LU
2O3) or a compound that decomposes into lutetium oxide (LU2O3) when heated, metallic iron or iron oxide (Fe2O3), or a compound that decomposes into iron oxide (Fe2O3) when heated and copper. Alternatively, copper oxide (CuO) or a compound that is decomposed by heating to produce copper oxide (CuO) is mixed with lutetium, iron, and copper in an atomic ratio of 1:1:1, It can be produced by heating in the air at a temperature of 800° C. or higher in an oxidizing atmosphere or in a reducing atmosphere to the extent that iron and copper are not reduced from their trivalent and divalent ion states, respectively.

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 smaller the particle size, the better.
It is preferable that it is below tm.

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 1:1 in terms of atomic ratio of lutetium, iron, and copper.
The ratio is 1:1.

If this ratio is exceeded, the target compound cannot be obtained. This mixture was heated for 800 min in air or in an oxidizing atmosphere or in a reducing atmosphere such that iron and copper could not be reduced from their trivalent and divalent ionic states.
Heat at temperatures above ℃. 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 LuFeCuO4 compound is
It 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 the reaction product were precisely weighed, and the stoichiometry of the resulting sample was determined. Examples Lutetium oxide (LU2O3) powder with a purity of 99.9% or more, a purity of 99.9%.
Iron oxide (Fe2O3) powder of 9f6 or higher and reagent grade copper oxide (CuO) powder were weighed at a molar ratio of 1:1:1, and ethyl alcohol was added in a mortar and mixed thoroughly. A fine powder with a particle size of several μm was obtained.

The mixture was placed in a platinum crucible, placed in a box-shaped siliconite furnace set at 1020°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 LuFeCuO4, 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 the drawing]

The drawing is an illustration of a LuFeCuO4 crystal of the present invention.

Claims (1)

[Claims] 1. A compound having a hexagonal layered structure represented by LuFeCuO_4. 2 Lutetium metal (Lu) or lutetium oxide (
Lu_2O_3) or a compound that is decomposed into lutetium oxide (Lu_2O_3) by heating;
Metallic iron (Fe) or iron oxide (Fe_2O_3), or iron oxide (Fe_2O_3) when heated
Compounds that are decomposed into copper (Cu) or copper oxide (C
uO) or a compound that decomposes to produce copper oxide (CuO) when heated, so that the atomic ratio of lutetium, iron, and copper is 1:1:1.
A hexagonal material represented by LuFeCuO_4, which is heated at a temperature of 00°C or higher in the air, in an oxidizing atmosphere, or in a reducing atmosphere to the extent that iron and copper 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.