Preparation and stabilization of γ-La_2S_3 at low temperature

• Published in: Journal of rare earths Vol. 29; no. 4; pp. 313 - 316
• Main Author: 罗昔贤 张明 马禄彬 彭勇
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2011
• Subjects: crystal growth; La 2S 3; rare earth sesquisulfide; rare earth sulfide; 低温度; 原子核; 反应过程; 氧化物; 铕掺杂; 铕离子掺杂; rare earth sesquisulfide; rare earth sulfide; crystal growth; La 2S 3
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60450-4

Eu doped γ-La2S3 were synthesized by the sulfurization of their oxide powders using CS2 gas at 700 ℃. During the sulfurizing reaction process, the cubic Eu3S4 crystals of prior formation acted as the nuclei sites of the γ-La2S3 phase to facilitate the nucleation process. The γ-La2S3 transformation occurred at significantly lower temperature by the combined contributions of low transformation enthalpy and induced multiple nuclei. On the other hand, the doped Eu ions could be inserted into the empty tetrahedral S4 cavities to stabilize the γ-La2S3 phase at temperature excess of 1100 ℃.