A low-temperature specific heat study of giant dielectric constant materials

C. P. Sun, Jianjun Liu, Jiunn-Yuan Lin, Chun Gang Duan, W. N. Mei, H. D. Yang

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

A low-temperature specific heat study has been performed on the insulating giant dielectric constant material CaCu3Ti4O12 and two related compounds, Bi2/3Cu3Ti4O 12 and La0.5Na0.5Cu3Ti 4O12, from 0.6 to 10 K. From analyzing the specific heat data in a very low-temperature range, 0.6-1.5 K, and moderately low-temperature range, 1.5-5 K, in addition to the expected Debye terms, we observed significant contributions originating from the linear and Einstein terms, which we attributed as the manifestation of low-lying elementary excitations due to lattice vibrations occurring at the grain boundaries and induced by local defects. Together with the findings on electronic and mechanical properties, a phenomenological model is proposed to explain the high dielectric constant behavior in both low and high frequency regions.

原文American English
文章編號285214
期刊Journal of Physics Condensed Matter
20
發行號28
DOIs
出版狀態Published - 16 7月 2008

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