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The influence of defects on ferroelectric and pyroelectric properties of Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 single crystals |
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| Authors: | Xiao Wu Linhua Liu Xiaobing Li Xiangyong ZhaoDi Lin Haosu LuoYanlin Huang |
| Affiliation: | a Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China b College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China c Graduate School of Chinese Academy of Science, Beijing 100049, China |
| Abstract: | Relaxor-based ferroelectric single crystals 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 (PMN-0.28PT) were grown by a modified Bridgman technique. The direct current (dc) conductivity was investigated and corresponding conduction mechanisms were discussed. V″Pb−VO defects are dominant from 245 °C to 650 °C. The ferroelectric properties of 1 1 1]-oriented PMN-0.28PT were systematically investigated, with the coercive field (Ec) of 5.2 kV cm−1 and remnant polarization (Pr) of 37.8 μC cm−2 at room temperature. Moreover, the dielectric and pyroelectric performances of PMN-0.28PT were measured and the integrated pyroelectric performances greatly enhanced after annealing in oxygen at 500 °C for 20 h. This is due to the decrease of oxygen vacancies in the single crystals when being annealed in the oxygen-rich atmosphere. These make 1 1 1]-oriented PMN-0.28PT crystals a promising candidate for infrared detectors and thermal imagers used at room temperature. |
| Keywords: | PMN-0 28PT single crystals Conductivity Oxygen vacancy Pyroelectric properties |
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