JPS5943412B2 - Compound having hexagonal layered structure represented by LuFeMnO↓4 and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel compound, LuFeMn04, having a hexagonal layered structure and a method for producing the same.

Conventionally, a compound having a hexagonal layered structure represented by YFe2q is known, and this compound is Y3+.

As shown by Fe2+Fe3+OH-, the divalent and trivalent ions of iron are surrounded by five-coordinated oxygen ions, and Y is a compound that has six-coordinated oxygen ions around it, and is magnetic. ing. The present invention provides the Y3+Fe2+
Lu3Ar″ instead of Y3+ in Fe3+OV compound
The object of the present invention is to provide a novel compound in which Mn gas is substituted for Fe2+, and a method for producing the same.

In the compound represented by LuFeMn0l of the present invention, iron is Fe3+ ion, manganese is Mn2+, L
u exists as a trivalent ion, and Lu3+F is also +M
It can be expressed as n1oH-.

This crystal has a hexagonal layered structure as shown in FIG. The largest circle in the figure is oxygen, and the smallest black circle is Fe and M.
n and the middle circle indicates Lu. Fe and Mn are entered randomly. Divalent ions of manganese and trivalent ions of iron are surrounded by five-coordinated oxygen ions and occupy the same position crystallographically. Moreover, Lu has six-coordinated oxygen around it. Oxygen, an anion, has a dense structure. The plane index (hKl) and the plane spacing (dA) of this crystal (
(do is actually measured dc is a calculated value), and the relative reflection intensity (I%) for X-rays is as shown in Table 1.

The space group is R3m, the crystal habit is plate-like, and the lattice constant is as follows. ao ■ 3.4450±O, 0
004(A)Q■25.632±O, 007(A) 1st
Expression Kldo [A-ldcCA] I [%] 0038.
5578.544830064.27 4 4.2 7
2 3 8101 2.9 9 6 2.9 6 3
10 010 2 2.9 09 2.9 0 6
70 09 2.8 4 8 2.8 48 4610
4 2.7 0 6 2.7 0 5 9 210
5 2.5 7 9 2.5 7 9 6 910 7
2.312 4 2.312 9 17108 2.
1824 2.1834 281010 1.9 4
3 5 1.9 4 4 2 3 5110 1.72
31 1.7225 491131.68901.68
851010131.64621.644912116
1.59751.597517 This compound is useful as a magnetic material as well as a semiconductor material.

This compound can be produced by the following method.

Lutetium oxide (Lu2O3), manganese oxide (M
nO) and iron oxide (Fe2O3) in a molar ratio of about 1:2:1, and heating the mixture at a temperature of 900 ° C. or less in a non-oxidizing atmosphere. can. Commercially available lutetium oxides used in the present invention may be used as they are, but in order to speed up the reaction between the oxides, the smaller the particle size, the better, particularly preferably 10 μm or less.

When used as a magnetic material, since contamination with impurities is to be avoided, the raw material should preferably be of high purity and should have been calcined in air at about 1000° C. for several hours. Manganese oxide of ordinary reagent grade level may be used. The particle size is preferably 10 μm or less for the same reason as the lutetium oxide.
In addition, a mixed gas of carbon dioxide and hydrogen (
Preferably, the mixture is calcined in a mixing ratio of 1:1 (volume ratio: 1:1) and rapidly cooled to 0° C., since the reaction speeds up. The iron oxide may be of special reagent grade. As mentioned above, the particle size is preferably 10 μm or less. Moreover, it is preferable to calcined in air at 800° C. for one day. These raw materials are thoroughly mixed as they are or with alcohol, acetone, etc. added.
These mixing ratios are LU2O3, Fe2O! The molar ratio is 1:2:1.

If this ratio is exceeded, the desired layered compound cannot be obtained. These mixtures are sealed in a quartz or glass container and heated under a non-oxidizing atmosphere. Since manganese is in a divalent state, in an oxidizing atmosphere (for example, in the atmosphere), manganese will be oxidized and become trivalent, so it is necessary to be in a non-oxidizing atmosphere. The heating temperature may be 900°C or higher, and the heating time is 10 minutes or more, preferably 1 hour 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 LuFeMn
The O4 compound had a black metallic luster and was found to have a crystalline structure by powder X-ray diffraction.

The valence of iron ions in the compound was determined by measuring the Mössbauer effect, and the valence of manganese ions was determined by gravimetric analysis, which measures the change in weight of the sample when it is heated in air. Example: Lutetium oxide with a purity of 99.9% or more (
LU2O3) powder, manganese oxide (MnO) powder with a purity of 99.9% or more, and iron oxide (MnO) powder with a purity of 99.9% or more.
Fe2O3) powder was weighed at a molar ratio of 1:2:1, acetone was added in a mortar, and the mixture was thoroughly mixed to obtain a fine powder mixture with an average particle size of several μm.

The mixture was placed in a transparent quartz tube (inner diameter 8 mm), the vacuum inside the tube was lowered to 1σ3 mmHg using a vacuum pump, the vacuum was maintained for about 1 hour, and the tube was melt-sealed with a gas burner. This is 100
The sample was placed in a box-shaped siliconite furnace set at 00C and heated for about 1 day, after which the sample was removed and rapidly cooled to room temperature. What was obtained was a hexagonal layered compound of LuFeMnO4. The properties of the crystal are shown in Table 1.
It was hot on the street.

[Brief explanation of drawings]

The drawing is a diagram of the crystal structure of LuFeMnO4 of the present invention. Middle circle...LUl smallest black circle...Fe and Mnl largest circle...oxygen.

Claims (1)

[Claims] 1. A compound having a hexagonal layered structure represented by LuFeMnO_4. 2 Lutetium oxide (Lu_2O_3), manganese oxide (MnO) and iron oxide (Fe_2O_3) are mixed in a molar ratio of approximately 1:2:1, and this mixture is heated at 900°C or higher in a non-oxidizing atmosphere. A method for producing a compound having a hexagonal layered structure represented by LuFeMnO_4, which comprises heating at a certain temperature.