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Formation Mechanism and Synthesis of Apatite‐Type Structure Ba 2+ x La 8− x (SiO 4 ) 6 O 2−δ
Author(s) -
Takeda Hiroaki,
Ohgaki Masataka,
Kizuki Takashi,
Hashimoto Kazuaki,
Toda Yoshitomo,
Udagawa Shigekazu,
Yamashita Kimihiro
Publication year - 2000
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.1151-2916.2000.tb01654.x
Subject(s) - thermogravimetry , differential thermal analysis , endothermic process , analytical chemistry (journal) , x ray crystallography , mineralogy , phase (matter) , materials science , apatite , crystallography , chemistry , diffraction , inorganic chemistry , adsorption , physics , organic chemistry , chromatography , optics
The formation process of Ba 2 La 8 (SiO 4 ) 6 O 2 was clarified using thermogravimetry–differential thermal analysis (TG‐DTA) and a high‐temperature powder X‐ray diffraction (HT‐XRD) method. Phase changes identified from the HT‐XRD data surprisingly corresponded to the weight loss and/or endothermic peaks observed in the TG‐DTA curves. Raw material with the composition Ba 2 La 8 (SiO 4 ) 6 O 2 was completely reacted at 1400°C and produced only an apatite‐type compound without a secondary phase. Moreover, the synthesis of Ba 2+ x La 8− x (SiO 4 ) 6 O 2−δ crystals with x = 0–2 was attempted using a solid‐state reaction.