Synthesis and Sintering of Cerium(III) Sulfide Powders |
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| Authors: | Shinji Hirai Kazuyoshi Shimakage Yasushi Saitou Toshiyuki Nishimura Yoichiro Uemura Mamoru Mitomo Leo Brewer |
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| Affiliation: | Department of Materials Science and Engineering, Muroran Institute of Technology, Muroran 050, Japan;National Institute for Research in Inorganic Materials, Tsukuba 305, Japan;Department of Chemistry, University of California at Berkeley, Berkeley, California 94720 |
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| Abstract: | Cerium(III) sulfide (Ce2S3) powder was synthesized via the sulfurization of ceria (CeO2) powder using carbon disulfide gas. Single-phase α-Ce2S3 could be formed via sulfurization at 973 K for 28.8 ks. The preparation of α-Ce2S3 became feasible at low temperature, in comparison to sulfurization using hydrogen sulfide gas. According to the fact that the formation of α-Ce2S3 was accelerated by the addition of carbon black to the CeO2 powder, carbothermic reduction was considered to become a dominant reaction, as the temperature increased. To obtain the activation energy for the densification of β-Ce2S3 powder, which was prepared by vacuum heating α-Ce2S3, the data of densification by hot pressing was analyzed by a kinetic equation that was proposed by other researchers. As a result, the sintering behavior could be best explained by a grain-boundary-diffusion mechanism that had an apparent activation energy of 382 kJ/mol. |
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