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Effects of porosity on dielectric and piezoelectric properties of porous lead zirconate titanate ceramics

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4 Author(s)
Yang, An-Kun ; Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People’s Republic of China ; Wang, Chang-An ; Guo, Rui ; Huang, Yong

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We report porous lead zirconate titanate ceramics fabricated by tert-butyl alcohol-based gel-casting process which show a very high thickness electromechanical coupling coefficient (0.77), high hydrostatic figure of merit (9594×10-15 m2/N), and low acoustic impedance (3.7 Mrayls). We show that the porosity effectively affects the performance of the samples in two ways: (1) a higher porosity simplifies the resonance behavior, leading to more efficient energy transduction; (2) its replacement of active ceramic phase leads to low relative permittivity, high hydrostatic figure of merit, and low acoustic impedance. It was confirmed the properties could be tailored by controlling the porosity.

Published in:

Applied Physics Letters  (Volume:98 ,  Issue: 15 )

Date of Publication:

Apr 2011

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