JPS63201017A - Compound having layer structure of hexagonal system shown in tmfeznmgo5 and its production - Google Patents

Abstract

PURPOSE:To obtain the titled novel compd. which is available as magnetic material, semiconductor material and catalytic material by mixing Tm or Tm2O3, etc., Fe or iron oxide, etc., Zn or ZnO, etc., and Mg or MgO, etc., at a prescribed atomic ratio and heating the mixture. CONSTITUTION:(A) Metallic Tm, Tm2O3 or a compd. forming Tm2O3 by thermal decomposition, (B) metallic Fe, iron oxide or a compd. forming iron compd. by thermal decomposition, (C) metallic Zn, ZnO or a compd. forming ZnO by thermal decomposition and (D) metallic Mg, MgO or a compd. forming MgO by thermal composition are mixed so that the proportion of Tm:Fe:Zn:Mg is regulated to 1:1:1:1 atomic ratio Then this mixture is heated at >=600 deg.C in the atmosphere or the oxidative atmosphere or in such the reducing atmosphere that Tm and Fe are trivalent ionic states respectively and Zn and Mg are not reduced from respective bivalent ionic states.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compound having a hexagonal layered structure represented by TmFeZnMgO5, which is a new compound useful as a magnetic material, a semiconductor material, and a catalyst material, and a method for producing the same.

Prior Art Conventionally, compounds having a hexagonal layered structure represented by (Yb"Fe"03) and Fe"O (n is an integer) have been synthesized by the present applicant and are known.

YbFezOn, YbFe07. Yb4FesO
+z and Yb4FesO+z lattice constant as a macrogonal system, YbO+, s layer, Fe01. s layer, Fe2O□
, Table 1 shows the number of layers in a two-layer unit cell.

These compounds contain n moles of YbFe0z per mole of iron oxide (Fed) (n = 1.2.3...)
It is a compound with a layered structure that is thought to be combined at a ratio of .

Purpose of the Invention The present invention relates to (YbFeOa) In the chemical formula of nFe0, n=%, 7 m 3 + is substituted for Yb'', and (Z n '''' + Mg ! + is substituted for Fe'').
) to provide a novel compound obtained by replacing the compound.

Constitution of the Invention The compound represented by T+wFeZnMgOs of the present invention is
In the ionic crystal model, 7II3+ (pe3*Znt+)
Mg! *0,2-, and its structure is TmO+
, s-layer, (Fe"Zn")Oz, s-layer, and MgO layer, and one of its characteristics is that it has remarkable structural anisotropy. Zn'' together with Fe'' forms the (Fe'', Zn'') Ot, s layer, and Mg2+ forms the MgO layer. The lattice constants as a hexagonal crystal system are as follows.

a = 3.411 ±0.001 (person) c = 2
2.81 ±0.01 (person) Planar index (hkj), plane spacing (do (person)) of this compound (d is the measured value +
Table 2 shows the relative reflection intensity (I (%)) for X-rays.

This compound is useful as a magnetic material, a semiconductor material, and a catalytic material. For example, it is possible to use it as a magnetic material, a semiconductor, and a catalytic material that has two-dimensional properties with strong anisotropy.

This compound can be produced by the following method.

Metallic thulium or thulium oxide or a compound that is decomposed into thulium oxide by heating; Metallic iron or iron oxide or a compound that is decomposed into iron oxide by heating;
Zinc metal or zinc oxide or a compound decomposed into zinc oxide by heating and magnesium metal or magnesium oxide or a compound decomposed into magnesium oxide by heating in an atomic ratio of Tm, Fe, Zn and Mg of 1:1. Mix at a ratio of 1:1:1, and reduce the mixture at a temperature of 600°C or higher in the air, in an oxidizing atmosphere, or in a state in which Tm and Fe are each in a trivalent ionic state &+ Zn and Mg are not reduced in a divalent ion state. Obtained by heating in an atmosphere.

Commercially available starting materials used in the present invention may be used as they are, but in order to speed up the chemical reaction,
The smaller the particle size, the better, particularly preferably 10 μm or less.

Furthermore, when used as a magnetic material or a semiconductor material, it is preferable to have high purity to avoid contamination with impurities.

Examples of compounds whose starting materials yield metal oxides by heating include hydroxides, carbonates, and nitrates of the respective metals.

The raw materials may be thoroughly mixed as they are or together with alcohols, acetone, etc.

The mixing ratio of the raw materials must be such that the atomic ratio of Tm, Fe, Zn, and Mg is 1:1:1:1. If this is removed, a single phase of the target compound cannot be obtained.

This mixture was mixed in the air, in an oxidizing atmosphere, or in a state where Tm and Fe were each trivalent ion, and Zn and Mg were each 2 ion.
600℃ in a reducing atmosphere that does not reduce from the valence ion state
Heat above. The heating time is several hours or more. There are no restrictions on the rate of temperature increase during heating. After heating, it can be rapidly cooled, or it can be rapidly drawn out into the atmosphere.

The obtained TmFeZnMgO5 compound powder was brown in color and was found to have a crystalline structure by powder X-ray diffraction. Its crystal structure is a layered structure, TmO+, s
layer, (Fe, Zn)Oz, s layer and ? Ig
It was found that it was formed by stacking O layers.

Example Thulium oxide (TIltOs) with a purity of 99.99% or more
powder.

Iron oxide (Pet's) powder with a purity of 99.9% or higher, reagent grade zinc oxide (ZnO), and reagent grade magnesium oxide (MgO) powder were weighed in a molar ratio of 1:1:2:2. , Add ethanol in an agate mortar, about 30
The mixture was mixed for a minute to obtain a fine powder mixture with an average particle size of several μm. The mixture was sealed in a platinum tube, placed in a tubular siliconite furnace set at 1300°C, 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 TmFeZnMgO5 single-phase,
Table 2 shows the results of measuring the interplanar spacing (do) and relative reflection intensity of each reflection using powder X-ray diffraction.

The lattice constants as a hexagonal crystal system were as follows.

a -3,411±0.001 (person) c -21,8
1±0.01 (person) Surface spacing (dc (person)) calculated from the above lattice constant and each plane index (hkJ) in Table 2
was in extremely good agreement with the actually measured surface spacing (do (person)).

f, -1-1 - Patent applicant: Takashi Nagase, National Institute for Inorganic Materials, Science and Technology Agency
Faith i ;1- Procedural amendment 1939! 77th of the month l Display of the case 1986 Patent Application No. 029209 Compound and its manufacturing method 3 Person making the amendment Relationship with the case Patent applicant Address Nobuo Setaka, 1-1 Namiki, Sakuramura, Niiharu-gun, Ibaraki Prefecture
” 4. Date of amendment order:
.

As per the voluntary amendment appendix, Attachment (1) The following sentence is added between lines 3 and 4 on page 10 of the specification.

"Effect of the invention

Claims (2)

[Claims] (1) A compound having a hexagonal layered structure represented by TmFeZnMgO_5. (2) Metallic thulium or thulium oxide or a compound that is decomposed into thulium oxide by heating, metallic iron or iron oxide or a compound that is decomposed into iron oxide by heating, and metallic zinc or zinc oxide or a compound that is decomposed into zinc oxide by heating. Tm, Fe, Zn and Mg
are mixed in an atomic ratio of 1:1:1:1, and the mixture is heated at a temperature of 600°C or higher in the air, in an oxidizing atmosphere, or in a state where Tm and Fe are each in a trivalent ion state, and Zn and Mg are in a trivalent ion state. A method for producing a compound having a hexagonal layered structure represented by TmFeZnMgO_5, which comprises heating in a reducing atmosphere that does not reduce the divalent ion state.