High Temperature Decarbonization of Neodymium Sesquisulfide by Hydrogen, Hydrogen Sulfide and Ammonia.

概要

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The removal of carbon impurity from Nd2S3 has been studied by heating in the gases of 4 % H2/N2, H2S and NH3. When the sulfide containing 1,200 mass ppm carbon impurity was heated in 4 % H2/N2 or H2S at 1,600 °C for 1 h, the carbon content decreased to 600 mass ppm. With NH3 gas, the carbon content decreased to 850 mass ppm by heating at a lower temperature of 1,000 °C for 1 h. Prolonged heating for 5 h resulted in further decrease of carbon content to 600 ppm. The mechanism of reaction of carbon with the above different gases is discussed in relation to the free energy change associated with the reactions. The phase transformation from - to -Nd2S3 was observed after the decarbonization with 4 % H2/N2 and H2S, while it did not occur during the low temperature processing at 1,000 °C in NH3.
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