JPS606890B2 - Compound having hexagonal layered structure represented by LuGaMgO↓4 and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel compound LUGaM or a compound having a hexagonal layered structure represented by 4, and a method for producing the same.

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, as shown in Y30Fe20Fe30042-, the divalent and trivalent ions of iron are 5-coordinated oxygen ions, and yttrium (Y) is 6-coordinated.
It is a compound that has coordinating oxygen ions around it and is magnetic. The present invention provides the above-mentioned Y30Fe2
10 Fe3 042 - L is 10 instead of Y3 0 of the compound,
Mzuju instead of Fe2ju, Ga3 instead of Fe3ju
The object of the present invention is to provide a novel compound that replaces 10, and a method for producing the same.

In the compound represented by LUGaMg04 of the present invention, lutetium is Lu30 ion, gallium is Ga
30, magnesium exists as Mg20, L
can be expressed as 10 Ga30 M 10042-.

This crystal has a hexagonal layered structure as shown in FIG. The largest circle represents oxygen, the middle circle represents lutetium, and the smallest black circles represent gallium and magnesium. ○a and Mg
are randomly distributed. Mg divalent ion and ○a
The trivalent ion of is surrounded by five-coordinated oxygen ions. Crystallographically, they occupy the same position. Also Lu
has six-coordinated oxygen in its place. Oxygen, an anion, has a delicate structure. s, t and u indicate positions within the unit cell. This crystal plane index (hk
l), surface spacing (d(A)) [do is actually measured, dc is calculated value.

], relative reflection intensity for X-rays, 1 (%) are as shown in Table 1. LuGaMg04 The first table space group is Rhym, its crystal habit is plate-like, and its lattice constant is as follows.

ao=3.3859 ±0.0002 (
A) Co=25.232 ±0.004
(A) This compound is useful as an optical material, a semiconductor material, and the like.

This compound can be produced by the following method.

Lutetium metal (Lu) is also known as lutetium oxide (L
u203) or a compound that decomposes into lutetium oxide (Lu203) when heated and metallic gallium, or gallium oxide (Ga203), or a compound that decomposes into gallium oxide (Ga203) when heated and magnesium Alternatively, magnesium oxide (Mg○) or a compound that decomposes when heated to produce magnesium oxide (Mg0) is mixed in such a way that the atomic ratio of lutetium, gallium, and magnesium is 1:1:1. It can be produced by heating at a temperature of 130,000 or higher in the air, in an oxidizing atmosphere, or in a reducing atmosphere to the extent that gallium and magnesium are not reduced below the trivalent ion state and divalent ion state, respectively. .

Commercially available starting materials used in the present invention may be used as they are, but in order for the chemical reaction between the starting materials to proceed quickly, the particle size should be as small as possible, especially 10 m or less. is preferred.

Further, when used as an optical material or an electrical material, since contamination with impurities is avoided, the higher the purity of the starting material material, the more preferable it is.

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 lutetium, gallium, and magnesium is 1:1:1.

If this ratio is exceeded, it will not be possible to obtain the desired compound. This mixture is heated to a temperature of 130,000 or higher in air or in an oxidizing atmosphere or in a reducing atmosphere such that gallium and magnesium 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 may be rapidly cooled to 0°C or rapidly drawn out into the atmosphere. The obtained LuGa
The M-4 compound was clear and colorless, and was found to have a crystalline structure by powder X-ray diffraction. The crystal structure was found to be the same as YFe204, which the applicant had already obtained.

Precisely weigh the sample weights of the starting mixed sample and reaction product,
The stoichiometric number of the obtained sample was determined. Example Lutetium oxide (Lu203) with a purity of 99.9% or more
Powder, gallium oxide (Ga203) with a purity of 99.9% or more
) powder, and reagent grade magnesium oxide (Mg○)
Weigh the powder at a molar ratio of 1:1:2, add ethyl alcohol in a mortar and mix thoroughly to obtain an average particle integer.
A fine powder of m was obtained.

The mixture was filled in a platinum rubbo and placed in a box-shaped siliconite furnace set at 145,000 ℃ and heated for 3 days, after which the sample was taken out of the furnace and rapidly cooled to room temperature. The obtained sample was LUGaMg04, and it was confirmed by powder X-ray diffraction that it was crystallographically the same type as the already 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 an illustration of the LUGaMg04 crystal of the present invention. The largest circle indicates oxygen, the middle circle indicates lutetium, and the smallest black circle indicates gallium and magnesium. younger brother drawing

Claims (1)

[Claims] 1. A compound having a hexagonal layered structure represented by LuGaMgO_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 gallium (Ga) or gallium oxide (Ga_2
O_3) or a compound that decomposes into gallium oxide (Ga_2O_3) when heated, and magnesium (Mg) or magnesium oxide (MgO), or a compound that decomposes when heated to produce magnesium oxide (MgO). are mixed in an atomic ratio of lutetium, gallium, and magnesium in an atomic ratio of 1:1:1, and gallium and magnesium are dissolved in an oxidizing atmosphere or in the trivalent ion state, respectively, in the air at a temperature of 1300°C or higher. LuGaMg is heated in a reducing atmosphere to the extent that it is not reduced beyond the valence ion state.
A method for producing a compound having a hexagonal layered structure represented by O_4.