Crum Jarrod V, Chong Saehwa, Peterson Jacob A, Riley Brian J
Pacific Northwest National Laboratory, Richland, WA 99352, USA.
Acta Crystallogr E Crystallogr Commun. 2019 Jun 21;75(Pt 7):1020-1025. doi: 10.1107/S2056989019008442. eCollection 2019 Jul 1.
Six different rare-earth oxyapatites, including Ca (SiO)O ( = La, Nd, Sm, Eu, or Yb) and NaLa(SiO)O, 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 6/ and showed similar unit-cell parameters. The isolated [SiO] tetra-hedra in each crystal are linked by the cations at the 4 and 6 sites occupied by and Ca in Ca (SiO)O or La and Na in NaLa(SiO)O. The lattice parameters, cell volumes, and densities of the synthesized oxyapatites fit well to the trendlines calculated from literature values.
通过基于溶液的方法，随后进行冷压和烧结，合成了六种不同的稀土氧磷灰石，包括Ca(SiO)O（= La、Nd、Sm、Eu或Yb）和NaLa(SiO)O。通过粉末X射线衍射（P-XRD）确定合成的氧磷灰石的晶体结构，并用电子探针微分析（EPMA）验证其化学组成。所有的氧磷灰石在六方空间群6/内都是同构的，并且显示出相似的晶胞参数。在每个晶体中，孤立的[SiO]四面体通过Ca(SiO)O中4和6位点上的阳离子（分别为和Ca）或NaLa(SiO)O中的La和Na连接。合成的氧磷灰石的晶格参数、晶胞体积和密度与根据文献值计算的趋势线拟合良好。
