Dielectric properties and phase transitions of (Pb0.87La0.02Ba0.1)(Zr0.6Sn0.4−xTix)O3 ceramics with compositions near AFE/RFE phase boundary |
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Authors: | Peng Liu Xi Yao |
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Affiliation: | a School of Physics and Information Technology, Shaan Xi Normal University, Xi'an 710062, People's Republic of China b Electronic Materials Reasarch Laboratory, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China |
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Abstract: | The electrical properties and phase transition behavior of (Pb0.87La0.02Ba0.1)(Zr0.6Sn0.4−xTix)O3 solid solutions (PLBZST, 0.04≤x0.2) were investigated by the X-ray diffraction, permittivity, pyroelectric current, and P-E electric hysterisis loops. As the composition x increased from 0.04 to 0.2, the antiferroelectric ceramics (x≤0.07, AFE) with tetragonal phase changed to the ferroelectric relaxors (RFE, 0.09≤x). AFE ceramics showed a peculiar diffuse phase transition and dielectric relaxation at the low temperature (down to −100 °C) due to a frustration between AFE and FE state. With an increase in composition x, electrically field-induced AFE-FE switching field (EAFE-FE) and AFE-paraelectric (PE) phase transition temperature (Tc) are depressed in the temperature (T)-Ti composition (x) phase diagram, a FE-AFE-PE triple phase point (Ttr) with the lowest transition temperature occurred at x=0.09. The pyroelectric currents under an application of various external electric field (E) were measured to identify a T-E phase diagram of the PLBZST compound. |
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Keywords: | 77.80+a 77.80.Bh 77.84&minus s 77.22.Gm |
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