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Method for preparing lanthanide nitride using metal oxide

A nitride and oxide technology, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high temperature and long time, and achieve the effects of simple equipment, low cost, and avoiding low purity

Inactive Publication Date: 2006-10-25
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few general-purpose methods for synthesizing lanthanide nitrides. The existing methods are mainly prepared by reacting lanthanide metal oxides and carbon powder at a high temperature of 1500°C for 15 hours in a nitrogen atmosphere, and the temperature required for the reaction is relatively high. , a long time (refer to literature 4: T.Nakagawa, K.Sako, T.Arakawa, T.A.Yamamoto, J.Alloys Compd.364(2004)53)

Method used

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  • Method for preparing lanthanide nitride using metal oxide
  • Method for preparing lanthanide nitride using metal oxide
  • Method for preparing lanthanide nitride using metal oxide

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Embodiment 1

[0019] Using metallic lithium with a purity of 99% as raw material, in a flowing nitrogen atmosphere with a purity of 99.999%, the temperature is increased from room temperature to 450°C at a rate of 15°C / min, and the temperature is kept for 30 minutes; then at a rate of 10°C / min Raise the temperature to 600°C and keep it for 60 minutes; turn off the power and cool down with the furnace to synthesize lithium nitride. Weigh 0.01 mol of synthetic lithium nitride and 0.005 mol of lanthanum oxide into an agate mill and grind until the lithium nitride becomes a powder. After the two are evenly mixed, apply a pressure of 15 MPa to the powder with a tablet press. After the powder is pressed into flakes, it is placed in a crucible made of stainless steel with an outer diameter of 16mm, an inner diameter of 14mm, and a height of 15mm. The crucible is placed in a quartz tube and the vacuum system is quickly connected to vacuum to 10 -4 After Pa, fill it with 0.4 atmospheres of nitrogen with...

Embodiment 2

[0021] Using metallic calcium with a purity of 99% as raw material, in a flowing nitrogen atmosphere with a purity of 99.999%, the temperature is increased from room temperature to 450°C at a rate of 15°C / min, and the temperature is kept for 30 minutes; then at a rate of 10°C / min Warm up to 600℃, keep the temperature for 60 minutes, turn off the power, cool with the furnace to synthesize calcium nitride; weigh 0.011mol of synthesized calcium nitride and 0.011mol of lanthanum oxide into an agate mill and grind until calcium nitride becomes powder The two are mixed uniformly. Use a tablet press to apply a pressure of 18 MPa to the powder. After the powder is pressed into flakes, it is placed into a crucible made of stainless steel with an outer diameter of 16 mm, an inner diameter of 14 mm and a height of 15 mm. Put it into the quartz tube and quickly connect the vacuum system to vacuum to 10 -4 After Pa, fill it with 0.4 atmospheres of nitrogen with a purity of 99.999%, then close ...

Embodiment 3

[0023] Using metallic magnesium with a purity of 99% as raw material, in a flowing nitrogen atmosphere with a purity of 99.999%, the temperature is increased from room temperature to 450°C at a rate of 15°C / min, and the temperature is kept for 30 minutes; then at a rate of 10°C / min Heat up to 600°C and keep it for 60 minutes; turn off the power and cool with the furnace to synthesize magnesium nitride; weigh 0.020mol of synthesized magnesium nitride and 0.015mol of lanthanum oxide into an agate mill and grind until magnesium nitride becomes powder The two are mixed uniformly. Use a tablet press to apply a pressure of 20 MPa to the powder, press the powder into a sheet and put it into a platinum crucible, put the crucible into a quartz tube and quickly connect the vacuum system to vacuum at the same time To 10 -4 After Pa, fill it with 0.3 atmospheres of nitrogen with a purity of 99.999%, then close the quartz tube, heat it to 900°C within 4 hours, keep it at this temperature for 2...

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Abstract

The invention discloses a method for preparing lanthanide nitride with metal oxide, comprising the steps of: uniformly mixing enough pure alkali metal nitride or alkaline-earth metal nitride with lanthanide metal oxide in a certain proportion and placing the mixture into a reaction vessel, placing the reaction vessel in a close environment filled with highly pure nitrogen gas, raising temperature of the reaction vessel to 800-900 deg.C and preserving heat for 2-6 hours, then natural cooling, taking out reaction product and soaking and washing the reaction product with alcohol, vacuum-drying and obtaining corresponding lanthanide nitride.

Description

Technical field [0001] The invention relates to a method for synthesizing lanthanide nitrides, in particular to a method for synthesizing lanthanide nitrides by chemical reaction between alkali metal nitrides or alkaline earth metal nitrides and lanthanide metal oxides. Background technique [0002] In recent years, the study of spintronics has gradually become an important direction in the study of condensed matter physics (refer to Literature 1: Wolf SA, Awschalom DD et al., Science, 294, (2001) 1488), and the search and development of new types of spin Electronic materials have become the basis of research. Semi-metal ferromagnet, due to its high spin polarization near the Fermi surface, is an ideal choice for spintronic devices (refer to Literature 2: de Groot RA, Mueller F Met al., Phys. Rev. Lett, 50 (1983) ) 2024). Lanthanide nitrides usually have a large magnetic pitch, which can still maintain good magnetic properties on the nanometer scale. Therefore, whether semi-metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 陈小龙宋波简基康王刚许燕萍
Owner INST OF PHYSICS - CHINESE ACAD OF SCI