JPS6024054B2 - Compound having hexagonal layered structure represented by ErGaMgO↓4 and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel compound EnuaMg04 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 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 yttrium (Y) is surrounded by six-coordinated oxygen ions, as shown in Y30Fe20Fe30○Ashi. It is a compound that has oxygen ions around it and is magnetic. The present invention provides the Y31Fe20F
e3 ○ reed - Er3 0, Fe instead of Y 3 0 in the compound
Mg20 instead of 20, Ga3 instead of Fe30
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 aMg04 in E of the present invention, erbium is an Er30 ion and gallium is a Ga3
10. Magnesium exists as Mg20, and E[
It can be expressed as 30Ga30Mg20○Reed.

This crystal has a hexagonal layered structure as shown in FIG. The largest white circle represents oxygen, the middle white circle represents erbium, and the black circles represent Mg and Ga, respectively. Mg and Ga are randomly distributed. The divalent ions of Mg and the trivalent ions of Ga are surrounded by five-coordinated oxygen ions. Crystallographically, they occupy the same position. Also, (Er) has oxygen at the 6th position around it. Oxygen, an anion, has a delicate structure. s, t and u indicate positions within the unit cell. The plane index (hkl) of this crystal,
Surface spacing (d(A)) [d.

is an actual measurement, and dc is a calculated value. ] The relative reflection intensity 1 (%) for X-rays is as shown in Table 1. The space group is Ri
m, its crystal habit is plate-like, and its lattice constant is as follows.

ao=3.4307±0.0005(A)c.

=25.094±0.007 (A) This compound is useful as a photonic material, a semiconductor material, and a catalyst.

This compound can be produced by the following method.

Metallic erbium (Er) or erbium oxide (Er)
2Q) Or, a compound that decomposes into erbium oxide (Er203) when heated, and metallic gallium, or gallium oxide (Ga203), or a compound that decomposes into gallium oxide (Ga203) when heated. Magnesium or magnesium oxide (
Mg0) or a compound that decomposes upon heating to produce magnesium oxide (Mg○), are mixed so that the atomic ratio of erbium, gallium, and magnesium is 1:1:1 to produce 1200 qo or more. At temperature,
It can be produced by heating in the air, in an oxidizing atmosphere, or in a reducing atmosphere to the extent that gallium and magnesium 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.

Further, when used as a backlight material or an electric material, since contamination with impurities is avoided, the higher the purity of the starting material material, the more preferable it is. Thoroughly mix this raw material as it is or with alcohol or acetone. The mixing ratio of these is 1:1:1 in terms of atomic ratio of erbium, gallium, and magnesium.

If this ratio is exceeded, the target compound cannot be obtained. This mixture is heated at a temperature of 1200 qo or more in air, an oxidizing atmosphere, or a reducing atmosphere such that gallium and magnesium cannot be reduced from their trivalent and divalent ion 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, the temperature can be raised to 0°C or the mixture can be rapidly drawn out into the atmosphere. aMg to the obtained E
Compound 04 exhibited a pink color and was 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 Erbium oxide (Er203) 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 size number r.
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 1400 qo and heated for 4 days, after which the sample was taken out of the furnace and rapidly cooled to room temperature. The obtained sample was E aMg04, 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 drawings]

The drawing is a diagram of ErGaM and 4 crystals of the present invention. The largest white circle indicates oxygen, the middle white circle indicates erbium, and the black circles indicate magnesium and gallium. Traditional drawing 1

Claims (1)

[Claims] 1 A compound having a hexagonal layered structure represented by ErGaMgO_4 2 Metal erbium (Er) or erbium oxide (Er_2O_3), or a compound that decomposes into erbium oxide (Er_2O_3) by heating, and metal gallium (Ga) Alternatively, gallium oxide (Ga_2O_3) or a compound that is decomposed into gallium oxide (Ga_2O_3) by heating and magnesium (Mg) or magnesium oxide (
MgO) or a compound that decomposes to produce magnesium oxide (MgO) when heated, with an atomic ratio of erbium, gallium, and magnesium of 1:1.
Mix in a ratio of 1:1 and heat in the air at a temperature of 1200°C or higher in an oxidizing atmosphere or in a reducing atmosphere to the extent that gallium and magnesium are not reduced to a trivalent ion state or a divalent ion state, respectively. A method for producing a compound having a hexagonal layered structure represented by ErGaMgO_4, characterized by