JPH0244250B2 - SCGAZN2MGO6DESHIMESARERUROTSUHOSHOKEINOSOJOKOZOOJUSURUKAGOBUTSUOYOBISONOSEIZOHO - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a compound having a hexagonal layered structure represented by ScGaZn ₂ MgO ₆ , which is a new compound useful as an optical functional material, a semiconductor material, etc., and a method for producing the same. Prior Art Conventionally, a compound having a hexagonal layered structure represented by (Yb ³⁺ Fe ³⁺ O ₃ ) _o Fe ²⁺ O (n represents an integer) was synthesized and known by the applicant. ing. YbFe ₂ O ₄ , Yb ₂ Fe ₃ O ₇ , Yb ₃ Fe ₄ O ₁₀ and
Lattice constant of Yb ₄ Fe ₅ O ₁₃ as hexagonal system, YbO _1.5
Table 1 shows the number of layers in the unit cell, FeO _1.5 layer, and Fe ₂ O _2.5 layer.

【table】

[Table] These compounds have a layered structure in which YbFeO ₃ is combined at a ratio of n (n = 1, 2, 3,...) moles per 1 mole of iron oxide (FeO). . Purpose of the Invention The present invention provides that in the chemical formula of (YbFeO ₃ ) _o FeO, n = 1/3, and Sc ³⁺ is substituted for Yb ³⁺ .
Ga ³⁺ instead of Fe ³⁺ , (2Zn ²⁺ instead of Fe ²⁺
+Mg ²⁺ ) is provided. Structure of the Invention The compound of the present invention is represented by ScGaZn ₂ MgO ₆ , and in the ionic crystal model, Sc ³⁺ (Ga ³⁺ , Zn ²⁺ )
Described as Mg ²⁺ Zn ²⁺ O ₆ ^2- , its structure is
ScO _1.5 layer, (Ga,Zn)O _2.5 layer, MgO layer and ZnO
It is formed by stacking layers, and one of its characteristics is that it has significant structural anisotropy. Half of the Zn ²⁺ forms a (Ga, Zn)O _2.5 layer with Ga ³⁺ , the other half of Zn ²⁺ forms a ZnO layer, and Mg ²⁺ forms a ZnO layer.
Creating an MgO layer. The lattice constants as a hexagonal crystal system are as follows. a=3.271±0.001 (Å) c=41.14±0.01 (Å) Planar index (hkl), interplanar spacing (d (Å)) of this compound
[d _p is the measured value, d _c is the calculated value] and the relative reflection intensity (I%) for X-rays are shown in Table 2. This compound is useful as an optical functional material, a semiconductor material, and a catalyst material. Examples include use as a phosphor and a semiconductor element.

【table】

[Table] This compound can be produced by the following method. Scandium metal or scandium oxide or a compound that decomposes into scandium oxide when heated; gallium metal or gallium oxide or a compound that decomposes into gallium oxide when heated; and zinc metal or zinc oxide or a compound that decomposes into zinc oxide when heated. , metallic magnesium, magnesium oxide, or a compound that is decomposed into magnesium oxide by heating,
Scandium, gallium, zinc, and magnesium are mixed in an atomic ratio of 1:1:2:1, and the mixture is heated at a temperature of 600°C or higher in the atmosphere.
It can be produced by heating in an oxidizing atmosphere or in a reducing atmosphere such that scandium and gallium are not reduced to a trivalent ion state, and zinc and magnesium are not reduced to a divalent ion state. Commercially available starting materials for use in the present invention may be used as they are, but in order for the chemical reaction to proceed quickly, the particle size is preferably small, particularly preferably 10 μm or less. Further, when used as an optical functional material or a semiconductor material, a highly pure material is preferable because contamination with impurities is avoided. This raw material is thoroughly mixed as it is or with an alcohol or acetone. The mixing ratio of these is such that the atomic ratio of Sc, Ga, Zn, and Mg is 1:1:2:1. If this ratio is off, a single phase of the target compound cannot be obtained. This mixture is heated at 600° C. or higher in the air, in an oxidizing atmosphere, or in a reducing atmosphere such that Sc and Ga cannot be reduced from their trivalent ion states, and Zn and Mg cannot be reduced from their divalent ion states. Heating time is several hours or more. There are no restrictions on the rate of temperature increase during heating. After heating, it may be rapidly cooled to 0°C or rapidly drawn out into the atmosphere. The resulting compound powder is colorless;
According to powder X-ray diffraction, it was found to have a crystal structure. Its crystal structure is layered,
It is formed by stacking _1.5 layers of ScO, _2.5 layers of (Ga, Zn)O, a ZnO layer, and a MgO layer. Examples Sc ₂ O ₃ powder with a purity of 99.99% or more, Ga ₂ O ₃ powder with a purity of 99.99% or more, reagent grade ZnO, and reagent grade ZnO
MgO powder was weighed at a molar ratio of 1:1:4:2, ethanol was added in an agate mortar, and the mixture was mixed for about 30 minutes to obtain a fine powder mixture with an average particle size of several μm. This mixture was sealed in a platinum tube, placed in a furnace set at 1450°C, heated for 8 days, and then the sample was taken out of the furnace and rapidly cooled to room temperature. The obtained sample was a single phase of ScGaZn ₂ MgO ₆ ,
The interplanar spacing _dp and relative reflection intensity of each reflection were measured by powder X-ray diffraction. The results were as shown in Table 2 above. The lattice constants as a hexagonal crystal system were a=3.271±0.001 (Å) and c=41.14±0.01 (Å). The above lattice constants and each reflection (hkl) in Table 2
The calculated interplanar spacing (d _c (Å)) matches the actually measured interplanar spacing (d _p (Å)) extremely well. Effects of the Invention The present invention provides novel compounds useful as optical functional materials, semiconductor materials, and catalysts.

Claims (1)

[Claims] 1. A compound having a hexagonal layered structure represented by ScGaZn ₂ MgO ₆ . 2 Scandium metal or scandium oxide or a compound that decomposes into scandium oxide when heated; gallium metal or gallium oxide or a compound that decomposes into gallium oxide when heated; and zinc metal or zinc oxide or a compound that decomposes into zinc oxide when heated. and metallic magnesium, magnesium oxide, or a compound decomposed into magnesium oxide by heating, such that the atomic ratio of scandium, gallium, zinc, and magnesium is 1:1:2:1, and the mixture is mixed. is heated at a temperature of 600°C or higher in the air, in an oxidizing atmosphere, or in a reducing atmosphere to the extent that scandium and gallium are not reduced to a trivalent ion state, and zinc and magnesium are not reduced to a divalent ion state. do
A method for producing a compound having a hexagonal layered structure represented by ScGaZn ₂ MgO ₆ .