標題: A low-temperature specific heat study of giant dielectric constant materials
作者: Sun, C. P.
Liu, Jianjun
Lin, J-Y
Duan, Chun-Gang
Mei, W. N.
Yang, H. D.
物理研究所
Institute of Physics
公開日期: 16-七月-2008
摘要: A low-temperature specific heat study has been performed on the insulating giant dielectric constant material CaCu(3)Ti(4)O(12) and two related compounds, Bi(2/3)Cu(3)Ti(4)O(12) and La(0.5)Na(0.5)Cu(3)Ti(4)O(12), 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.
URI: http://dx.doi.org/10.1088/0953-8984/20/28/285214
http://hdl.handle.net/11536/8569
ISSN: 0953-8984
DOI: 10.1088/0953-8984/20/28/285214
期刊: JOURNAL OF PHYSICS-CONDENSED MATTER
Volume: 20
Issue: 28
結束頁: 
顯示於類別:期刊論文


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