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Synthesis and Crystal Structure Characterization of Silicate Apatite Sr 2 Y 8 (SiO 4 ) 6 O 2
Author(s) -
Shen Yiqiang,
Tok Alfred,
Dong Zhili
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03563.x
Subject(s) - apatite , crystal structure , silicate , crystallography , rietveld refinement , materials science , mineralogy , x ray crystallography , powder diffraction , analytical chemistry (journal) , chemistry , diffraction , physics , organic chemistry , chromatography , optics
Pure Sr 2 Y 8 (SiO 4 ) 6 O 2 powders were obtained after a solid‐state reaction at 1400 °C for 6 h using the nanosized Y 2 O 3 , commercial SrCO 3 , and silica gel. The nanosized Y 2 O 3 powder was synthesized by a precipitation method using Y(NO 3 ) 3 and NH 4 HCO 3 , followed by a heat treatment. The crystal structure of Sr 2 Y 8 (SiO 4 ) 6 O 2 was characterized by powder X‐ray diffraction, Rietveld refinement, and high‐resolution transmission electron microscopy. Results show that Sr 2 Y 8 (SiO 4 ) 6 O 2 has a typical apatite‐type structure A I 4 A II 6 (BO 4 ) 6 X 2 in the P 6 3 / m space group. The lattice parameters are a =9.3884(6) Å and c =6.8657(4) Å. There are two special sites, A I (4f) and A II (6h), in the apatite structure. The A II sites are fully occupied by Y, while the A I sites are randomly filled by Y and Sr atoms. The crystallographic data obtained from Sr 2 Y 8 (SiO 4 ) 6 O 2 and other silicate oxyapatites are compared and summarized.