Structure and ionic conductivity of the lacunary apatite Pb6Ca2Na2(PO4)6

被引：17
|
作者：
Naddari, T
El Feki, H
Savariault, JM
Salles, P
Ben Salah, A
机构：
[1] Ctr Elaborat Mat & Etud Struct, F-31055 Toulouse 4, France
[2] Fac Sci SFAX, Lab Sci Mat & Environm, Sfax 3018, Tunisia
来源：
SOLID STATE IONICS | 2003年 / 158卷 / 1-2期
关键词：
lead apatite; lacuna; structure; ionic conductivity; phase transition;
D O I：
10.1016/S0167-2738(02)00609-4
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Polycrystalline Pb6Ca2Na2(PO4)(6) (NCPbAp) was obtained via a solid state reaction. It was characterized by IR spectrometry and X-ray diffraction, its structure was refined using the Rietveld method. It crystallizes in the hexagonal system (s.g. P6(3)/m, a = 9.658(8) Angstrom and c = 7.081(6) Angstrom) and presents a lacunary structure stabilized by the electron lone pair of lead (II) ions. At 720 K, an order-disorder phase transition probably of first order is observed either in conductivity or XRD studies versus temperature. Electric conductivity is dominated by the mobility of sodium in the tunnels. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：157 / 166
页数：10
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