Electron irradiation induced transformation of (Pb5Ca5)(VO4)6F2 apatite to CaVO3 perovskite

被引：15
作者：
Dong, ZL
White, TJ [1 ]
Sun, K
Wang, LM
Ewing, RC
机构：
[1] Ctr Adv Res Ecomat, Inst Environm Sci & Engn, Singapore 637723, Singapore
[2] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2005年 / 88卷 / 01期
关键词：
D O I：
10.1111/j.1551-2916.2004.00002.x
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Crystallochemical changes of (Pb5Ca5)(VO4)(6)F-2 apatite under electron irradiation were examined by transmission electron microscopy. The apatite, a synthetic analog of vanadinite, was moderately stable towards a less intense 300-keV LaB6 source, while it changed rapidly in structure when exposed to the higher flux of a 200-keV field emission gun. The electron beam induced transformation of vanadinite proceeds sequentially by (i) migration and loss of fluorine, (ii) lead volatilization and conversion to 2-5-nm platelets of a glaserite-type structure, and (iii) the reduction of V5+ to V4+ with the removal of lead and calcium oxide that leads to single-crystal CaVO3 perovskite as the ultimate product. The phase transformations are interpreted based on the crystallographic relations among the CaVO3 perovskite, the (Pb5Ca5)(VO4)(6)F-2 apatite and the glaserite-type structures, and compositional changes under electron irradiation.
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页码：184 / 190
页数：7
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