Temperature dependent total scattering structural study of CaCu3Ti4O12

被引:45
作者
Bozin, ES [1 ]
Petkov, V
Barnes, PW
Woodward, PM
Vogt, T
Mahanti, SD
Billinge, SJL
机构
[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[2] Michigan State Univ, Ctr Fundamental Mat Res, E Lansing, MI 48824 USA
[3] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA
[4] Ohio State Univ, Dept Chem, Columbus, OH 43210 USA
[5] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
关键词
D O I
10.1088/0953-8984/16/44/007
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
X-ray and neutron powder diffraction data as a function of temperature are analysed for the colossal dielectric constant material CaCu3Ti4O12. The local structure is studied using atomic pair distribution function analysis. No evidence is found for enlarged oxygen or Ti displacement parameters suggesting that short range octahedral tilt disorder and off-centre Ti displacements are minimal. However, an unusual temperature dependence for the atomic displacement parameters of calcium and copper is observed. Temperature dependent modelling of the structure, using bond valence concepts, suggests that the calcium atoms become underbonded below approximately 260 K, which provides a rationale for the unusually high Ca displacement parameters at,low temperature.
引用
收藏
页码:S5091 / S5102
页数:12
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