Abstract
Synthesis of neodymium sulfide from neodymium sulfate by carbon reduction was studied with the aim to develop a new sulfide production process which is technologically adoptable. Reduction of anhydrous neodymium sulfate Nd2 (SO4) 3 by hydrogen was found not to be sufficient to form sesquisulfides Nd2S3, resulting in the formation of oxysulfide Nd2O2S. Neodymium sesquisulfide (γ-Nd2S3) was formed as a mixture with Nd2O2S when the anhydrous sulfate was heated with activated carbon in nitrogen over 1, 273 K. The monophasic α-Nd2S3 was obtained by the reduction with activated carbon in the presence of sulfur vapor over 1, 073 K. The formation of Nd2S3 by carbon reduction of Nd2 (SO4) 3 was thermodynamically discussed. The lattice parameters of α-Nd2S3 were a=0.7444±0.0001, b=1.5519±0.0002, c=0.4028±0.0001nm which were in good agreelnent with the calculated and reported values. The Nd2S3 obtained by the similar way at 1, 273 K contained a smaller amount of impurities of carbon, nitrogen and/or oxygen compared with those obtained at 1, 073 K.
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