LiSc(SeO3)2·xH2O (0 ≤ x ≤ 1): New Selenites Revealing Water Molecule-Driven Extremely High Temperature Single-Crystal-to-Single-Crystal Transformations
详细信息 查看全文
- 作者：Seung Yoon Song ; Kang Min Ok
- 刊名：Crystal Growth & Design
- 出版年：2016
- 出版时间：June 1, 2016
- 年：2016
- 卷：16
- 期：6
- 页码：3076-3080
- 全文大小：397K
- 年卷期：0
- ISSN：1528-7505
文摘
Water molecule-driven reversible phase transitions up to 450 °C have been observed for the first time in a novel selenite crystal, LiSc(SeO3)2·H2O, through single-crystal-to-single-crystal (SCSC) transformations. Single crystal X-ray diffraction suggests that LiSc(SeO3)2·H2O (P2/c) transforms to LiSc(SeO3)2·0.5H2O (P1̅), LiSc(SeO3)2·0.25H2O (P1̅), and α-LiSc(SeO3)2 (I–42d) at 170–190, 200–230, and 240–450 °C, respectively. The structural evolution is attributable to the different positions of Li+ cations within the eight-membered ring (8-MR) channel, in which the amount of water molecules plays a key role in determining the coordination environment and the subsequent location of Li+ cations. Further heating of the crystal to 500 °C results in a remarkably stable β-LiSc(SeO3)2 (R3̅).