等结构
电子探针
结晶学
晶体结构
稀土
材料科学
晶体化学
粉末衍射
电子探针显微分析
Crystal(编程语言)
X射线晶体学
矿物学
化学
衍射
物理
程序设计语言
光学
计算机科学
作者
Jarrod V. Crum,Saehwa Chong,James M. Peterson,Brian J. Riley
标识
DOI:10.1107/s2056989019008442
摘要
Six different rare-earth oxyapatites, including Ca2RE8(SiO4)6O2 (RE = La, Nd, Sm, Eu, or Yb) and NaLa9(SiO4)6O2, were synthesized using solution-based processes followed by cold pressing and sinter-ing. The crystal structures of the synthesized oxyapatites were determined from powder X-ray diffraction (P-XRD) and their chemistries verified with electron probe microanalysis (EPMA). All the oxyapatites were isostructural within the hexa-gonal space group P63/m and showed similar unit-cell parameters. The isolated [SiO4]4- tetra-hedra in each crystal are linked by the cations at the 4f and 6h sites occupied by RE3+ and Ca2+ in Ca2RE8(SiO4)6O2 or La3+ and Na+ in NaLa9(SiO4)6O2. The lattice parameters, cell volumes, and densities of the synthesized oxyapatites fit well to the trendlines calculated from literature values.
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