Local structural change of CaCuTiO $_{12}$ in low temperature phase

Yoneda, Yasuhiro ; Yoshii, Kenji ; Hayakawa, Hironori*; Aoyagi, Rintaro*; Ikeda, Naoshi*

Insulating cubic compound CaCuTiO $_{12}$ (CCTO) has attracted much interest because of its giant change in the dielectric response with temperature. This compound possesses a low-frequency dielectric constant, 10, which is only varying in the temperature range 100 - 600K. However, dielectric measurements indicated that the CCTO is electrically inhomogenious by analyzing its impedance. The inhomogenity may originated by grain and grain-boundary contributions. We performed synchrotron X-ray pair-distribution function (PDF) analysis in order to visualize this inhomogenity. The obtained PDF changed depending on the grain size. The PDF showed that the origin of huge dielectric constant is extrinsic Maxwell-Wagner type due to the sample inhomogenity.

Language	:	Japanese
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Meeting title	:	日本物理学会2008年秋季大会(物性)
Held date	:	2008/09
Location (city)	:	盛岡
Location (country)	:	日本
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : BB20081563
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Local structural change of CaCuTiO in low temperature phase

Local structural change of CaCuTiO $_{12}$ in low temperature phase