Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (6): 683-689.DOI: 10.11944/j.issn.1000-0518.2019.06.180327

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Effect of Ca2+-Doping on Synthesis Temperature and Heat Stability of γ-Ce2S3

WANG Zhumei,MA Zhenguo,LI Yueming(),GAO Yiqun,SONG Fusheng,SHEN Zongyang,LI Zhike   

  1. China National Light Industry Key Laboratory of Functional Ceramic Materials,School of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen,Jiangxi 333403,China
  • Received:2018-10-12 Accepted:2018-12-24 Online:2019-06-01 Published:2019-06-03
  • Contact: LI Yueming
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51462010), the Natural Science Foundation of Jiangxi Province of China(No.2017ACB20022)

Abstract:

CeCl3·7H2O, CaCl2·2H2O and C2H2O4·2H2O were used as raw materials to prepare Ca2+-doped cerium oxalate by the coprecipitation method. The Ca2+-doped cerium oxalate was calcined to obtain Ca2+-doped cerium oxide precursor. Ca2+-doped γ-Ce2S3 was achieved by vulcanizing precursors in an Ar atmosphere using CS2 as the sulfur source. Pigments were characterized by X-ray diffraction(XRD), energy dispersive spectrometer(EDS), color analyzer, UV-Vis spectrophotometer and thermogravimetric analysis-differential thermal analysis(TG-DTA). The results show that Ca2+-doping can lower the synthesis temperature and improve the thermal stability of pigments in air. When the ratio of n(Ca2+):n(Ce3+)≥0.16, pure phase γ-Ce2S3 can be obtained by vulcanizing at 900 ℃ for 150 min. The synthesis temperature of doped γ-Ce2S3 decrease by 300 ℃ compared with undoped γ-Ce2S3. When the n(Ca2+):n(Ce3+) is 0.64, the oxidation exothermic peak of Ca2+-doped γ-Ce2S3 increases from 490.6 to 541.0 ℃.

Key words: γ-cerium sesquisulfide;, red pigment, calcium doping, synthesis temperature, stability