JPS63295437A - Compound shown by tmfezn8o11 and having hexagonal lamellar structure and its production - Google Patents

Abstract

PURPOSE:To easily obtain the title compd. useful as a magnetic material, a semiconductor material, etc., by mixing a compd. such as metallic Tm, a compd. such as metallic iron, and a compd. such as metallic zinc in a specified ratio, and heating the mixture in the atmosphere, etc. CONSTITUTION:A compd. such as high-purity metallic Tm having <=10mum particle diameter, a compd. such as metallic iron, and a compd. such as metallic zinc are mixed so that the atomic ratio of Tm, Fe, and Zn is adjusted to 1/1/8 to obtain a mixture. The mixture is heated at >=600 deg.C for >=1hr in the atmosphere, in an oxidizing atmosphere, or in the reducing atmosphere wherein the trivalent ions of Tm and Fe and the bivalent ion of Zn are not reduced, and then quenched. After quenching, the material is taken out into the atmosphere to obtain the compd. of TmFeZn8O11 wherein Yb<3+> is substituted for Tm<3+> and Fe<2+> for Zn<2+> in the chemical formula I wherein n=1/8, exhibiting an ionic crystal model shown by formula II, consisting of a TmO1.5 layer, an (Fe, Zn)O2.5 layer, and a ZnO layer, and having a hexagonal lamellar structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compound having a hexagonal layered structure represented by D-Fe2, O□, which is a novel compound useful as a magnetic material, a semiconductor material, a catalyst material, etc. and its manufacturing method.

PRIOR ART Conventionally, a compound having a hexagonal layered structure represented by (ma b"Fe"<53)IFe"6 (n represents an integer) was synthesized by the present applicant and is known.

'IbFe@64. Tb2Fe@61. 'fb@F
Lattice constant of e46I@ and Yb4Fe5Q12 as a hexagonal system, ma b6. ,, layer, Fa (51, 5 layers, F
Table 1 shows the calendar numbers in the unit cell of the aJ1*I layer.
It is as follows.

These compounds are based on 1 mole of iron oxide (FeO),
Ma bFeo@ga n mok (n ; 1 p 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 provides that in the chemical formula of (YbFe(1,)#Feel, n=I/, and Tm'' is replaced by F in place of Ybi'').
The object of the present invention is to provide a novel compound obtained by replacing Zn'' in place of e''°.

Structure of the Invention In the ionic crystal model, the compound represented by TmFeZn@O1t of the present invention is Ts"(Fe"Zn")Zn7"
◆It is described as "II"-, and its structure is T+*ell
*It is formed by stacking 5 layers, (Fe, Zn) 0201 layer and ZnO layer, and one of its characteristics is that it has remarkable structural anisotropy. l of Zn” ion
/, forms a (Fe"Zn")Q□, layer with Fe", and the remaining 77 forms Zn (5 layers). The lattice constant as a hexagonal crystal system is as follows.

a=3.301±0.001 (A) c=53.42±0.01 (A) Planar index (b k ffi ), plane spacing (d
(A)) (dO is the measured value p dC is the calculated value) and the relative reflection intensity (1 (%)) with respect to X@ is shown in Table-
This is the 2nd post.

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

Compound B can be produced by the following method.

Metallic thulium or thulium oxide or a compound that decomposes into thulium oxide when heated; Metallic iron or iron oxide or a compound that decomposes into iron oxide when heated;
Metallic zinc, zinc oxide, or a compound decomposed into zinc oxide by heating is mixed with Ts, Fe, and Zn in an atomic ratio of 1:1:8, and the mixture is heated to 60%
At a temperature of 0°C or higher, in the air, in an oxidizing atmosphere, or in a T
- and Fe are each in a trivalent ion state, and Zn is in a divalent ion state by heating in a reducing atmosphere in which they are not reduced.

Commercially available starting materials used in the present invention may be used as they are, but in order to allow the chemical reaction to proceed rapidly, it is better for 2ζ to have a small particle size, particularly preferably 10 μm or less.

Further, when used as a magnetic material or a semiconductor material, it is preferable to have high purity since contamination with impurities is avoided. Compounds whose starting materials yield metal oxides upon heating include:
Examples include hydroxides, carbonates, and nitrates of each metal.

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

The mixing ratio of the raw materials must be such that the ratio of T■#Fe# and Zn is 1:1:8 in atomic ratio. If this is removed, 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 in which Tm+ and Fe are not reduced from their respective 3aiii ion states, and Zn is not 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 can be rapidly cooled, or it can be rapidly drawn out into the atmosphere.

The obtained TmFeZn@611 compound powder was brown in color and was found to have a crystal structure by powder X-ray diffraction. Its crystal structure is layered and TaO2,%
Layer * It was found that it was formed by stacking five layers of (pe, Zn)02s and five layers of Zr+.

Example Thulium oxide with purity of 99.99% or more (7wt15s
) powder, iron oxide (Fe, el, ) with a purity of 99.9% or more
powder.

Reagent-grade zinc oxide (Zn6) powder was weighed at a molar ratio of 1:1:16, ethanol was added in an agate mortar, and the mixture was mixed for about 30 minutes to form a fine powder mixture with an average particle size of several μm. Obtained. The mixture was sealed in a platinum tube, placed in a tubular siliconite furnace set at 1450°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 a TmFeZn@6@1 single-phase, and each plane index (hkt) was determined by powder xs diffraction method.

The results of measuring the interplanar spacing (d,) and relative reflection intensity are shown in Table 2.

The lattice constant as a hexagonal system is a=3,301±0.001(A) c=53.42±0.01 (A) Met.

The interplanar spacing (d c (A)) calculated from the above lattice constant and the planar index (hkl) in Table 2 is the actually measured interplanar spacing (d
O(A)) was in excellent agreement.

Effects of the Invention The present invention provides novel compounds useful as magnetic materials, semiconductor materials, and catalysts.

Claims (2)

[Claims] (1) Compound with hexagonal layered structure represented by TmFeZn_8O_1_1 (2) Metallic thulium or thulium oxide or a compound that decomposes into thutium oxide when heated; metallic iron or iron oxide or a compound that decomposes into iron oxide when heated; metal zinc or zinc oxide or a compound that decomposes into zinc oxide when heated. and Tm
, Fe and Zn are mixed in an atomic ratio of 1:1:8, 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 is in a trivalent ion state. TmFeZn_8O_1, which is characterized by heating in a reducing atmosphere that does not reduce the state from a divalent ion state.
A method for producing a compound having a hexagonal layered structure represented by _1.