Thermogravimetric study of reduction and sulfurization of Y2(SO4)3 using carbon disulfide

Milan Skrobian, Nobuaki Sato, Kohta Yamada, Takeo Fujino

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The reaction of Y2(SO4)3 with CS2 was studied using thermogravimetry. Anhydrous yttrium sulfate Y2(SO4)3 first decomposes to Y2O2SO4 at temperatures which depend upon the heating rate, namely 550-650°C at 1 K min-1 and 550-750°C at 5 K min-1. With increasing temperature, Y2O2SO4 is further deoxidized to Y2O2S, and in this step the heating rate exerts a larger effect than in the first step. This reaction is complete at 700 and 875°C at heating rates of 1 and 5 K min-1, respectively. The last step involves the reaction of Y2O2S to form δ-Y2S3. Single phase Y2S3 was formed at ≈ 950°C when the heating rate was as low as 1 K min-1. When the heating rate was increased to 5 K min-1, a small amount of unreacted Y2O2S was found in the Y2S3 product. The compound YS2 - x, which was determined as YS1.85, was stable below ≈ 600°C and decomposed to Y2S3 at higher temperatures. The difference of the present reaction from the reaction of Nd2(SO4)3 with CS2 lies mainly in the decomposition of sulfate to oxysulfate and the sulfurization of oxysulfide to sesquisulfide.

Original languageEnglish
Pages (from-to)201-209
Number of pages9
JournalThermochimica Acta
Volume255
Issue numberC
DOIs
Publication statusPublished - 1995 May 1

Keywords

  • Carbon disulphide
  • TG
  • Yttrium disulphide
  • Yttrium oxysulphate
  • Yttrium oxysulphide
  • Yttrium sesquisulphide
  • Yttrium sulphate

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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