著者

Michihiro Ohta Shinji Hirai Hisanaga Kato Vladimir V. Sokolov Vladimir V. Bakovets

出版者

The Japan Institute of Metals and Materials

雑誌

MATERIALS TRANSACTIONS (ISSN:13459678)

巻号頁・発行日

vol.50, no.7, pp.1885-1889, 2009-07-01 (Released:2009-06-25)

参考文献数

30

被引用文献数

34 40

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The thermal decomposition of ammonium thiocyanate (NH4SCN) was studied by thermogravimetry, differential thermal analysis, and mass spectrometry. It occurred in the temperature range from 400 to 530 K. The decomposition products contained NH3, CS2, H2S, and HNCS gases. Rare-earth oxides were reacted with these gases at 1273 K for 8 h in order to prepare rare-earth sulfides. The single tetragonal β-La2S3 phase was formed after the sulfurization of La2O3. In contrast, the single orthorhombic α-Gd2S3 phase was formed after the sulfurization of Gd2O3. These powders were consolidated by pressure-assisted sintering to fabricate the thermoelectric elements.