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The thermal decomposition of ammonium thiocyanate (NH 4 SCN) 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 NH 3 , CS 2 , H 2 S, 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-La 2 S 3 phase was formed after the sulfurization of La 2 O 3 . In contrast, the single orthorhombic α-Gd 2 S 3 phase was formed after the sulfurization of Gd 2 O 3 . These powders were consolidated by pressure-assisted sintering to fabricate the thermoelectric elements.

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Thermal Decomposition of NH&lt;SUB&gt;4&lt;/SUB&gt;SCN for Preparation of Ln&lt;SUB&gt;2&lt;/SUB&gt;S&lt;SUB&gt;3&lt;/SUB&gt; (Ln=La and Gd) by Sulfurization