Crystal growth of alkaline earth vanadates from hydroxide fluxes
- 作者：Samuel J. Mugavero III ; M. Bharathy ; Jilian McAlum ; Hans-Conrad zur Loye
- 关键词：Barium vanadates ; Hydroxide flux ; Crystal structure ; Isolated VO4 tetrahedra
- 刊名：Solid State Sciences
- 出版年：2008
- 期刊代码：98_12932558
- 类别：ch
- 出版时间：April 2008
- 卷：10
- 期：4
- 页码：370-376
- 文件大小：805 K
摘要
We report the crystal growth and structural characterization of four alkaline earth vanadates synthesized from alkali metal hydroxide flux reactions. The use of molten hydroxides has led to the preparation of the novel hydroxy apatites, A5(VO4)3(OH) (A = Sr, Ba), isolated from mixed NaOH/A(OH)2 (A = Sr, Ba) flux reactions contained in sealed silver tubes. Ba5(VO4)3(OH) and Sr5(VO4)3(OH) crystallize in the hexagonal space group, P63/m with a = 10.4589(2) Å, c = 7.8476(3) Å, V = 743.43(3) Å3 and a = 10.0570(4) Å, c = 7.4349(7) Å, V = 651.24(7) Å3, respectively. The crystal structures consist of isolated VO4 tetrahedra separated by layers of Sr/BaOx polyhedra. In addition, we also report the crystal growth of KBaVO4 and Ba3(VO4)2 from hydroxide fluxes.