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Ferroelectriclike and pyroelectric behavior of $CaCu_3Ti_4O_{12}$ ceramics

Prakash, Shri B and Varma, KBR (2007) Ferroelectriclike and pyroelectric behavior of $CaCu_3Ti_4O_{12}$ ceramics. In: Applied Physics Letters, 90 (8). 082903:1-3.

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A ferroelectriclike hysteresis loop was obtained at room temperature for $CaCu_3Ti_4O_{12}$ (CCTO) ceramic. The remnant polarization and coercive field for 1100 °C/5 h sintered $CaCu_3Ti_4O_{12}$ ceramics were 0.063 $\mu C/cm^2$ and 195 V/cm, respectively. Remnant polarization increased while the coercive field decreased with increase in sintering temperature/duration, implying that these were microstructural dependent. The observation of the hysteresis loop for CCTO ceramic was corroborated by its pyroelectric behavior, and the pyroelectric current at room temperature was −0.0028 nA. These findings were attributed to the presence of mixed-valent Ti ions, apart from off center displacement of Ti ions in $TiO_6$ octahedra.

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to the American Institute of Physics.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 09 Apr 2007
Last Modified: 19 Sep 2010 04:36
URI: http://eprints.iisc.ac.in/id/eprint/10555

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