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Preparation of Rare Earth Nitrides by Self Sustained Heat of Reaction

IP.com Disclosure Number: IPCOM000090232D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Schaefer, HG: AUTHOR

Abstract

The method is for preparing the rare earth nitrides, e.g., GdN. The method is also applicable for the synthesis of various high-melting compounds of the rare earths, e.g., of Dy and Ho. This method uses the rare earth sponge, where the particle size, cross-section thickness and overall mass are key factors. These make possible a self-sustaining reaction which drives the reaction to completion.

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Preparation of Rare Earth Nitrides by Self Sustained Heat of Reaction

The method is for preparing the rare earth nitrides, e.g., GdN. The method is also applicable for the synthesis of various high-melting compounds of the rare earths, e.g., of Dy and Ho. This method uses the rare earth sponge, where the particle size, cross-section thickness and overall mass are key factors. These make possible a self-sustaining reaction which drives the reaction to completion.

The rare earth sponge is suspended between two carbon electrodes in a quartz tube furnace having nitrogen gas flowing over the sample. A voltage is applied across the electrodes by a variable transformer. The circuit breaker is activated and a surge of current heats the sample to a sufficient temperature to initiate a spontaneous heat of reaction. The reaction goes to completion in a few seconds. The sample is allowed to cool.

There are various advantages and features of this procedure. Through a surge of current, enough heat is developed where a self-sustained reaction takes place nitriding the material in a matter of seconds. The particle size and the cross-section thickness of the sponge and mass are the key factors in the percentage of theoretical nitrogen gain. There is no crucible contamination. Since the reaction takes a matter of seconds, little if any oxygen is picked up. The nitride produced is easily ground for combination with other compounds.

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