Dielectric/piezoelectric properties and temperature dependence of domain structure evolution in lead free single crystal |
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| Authors: | Dabin Lin Zhenrong Li Shujun Zhang Zhuo Xu Xi Yao |
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| Institution: | aElectronic Materials Research Laboratory, Key Laboratory of Education Ministry, Xi’an Jiaotong University, Xi’an 710049, China;bMaterials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA |
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| Abstract: | (K0.5Na0.5)NbO3 (KNN) single crystals were grown using a high temperature flux method. The dielectric permittivity was measured as a function of temperature for 001]-oriented KNN single crystals. The ferroelectric phase transition temperatures, including the rhombohedral–orthorhombic TR−O, orthorhombic–tetragonal TO−T and tetragonal–cubic TC were found to be located at −149  C, 205 C and 393 C, respectively. The domain structure evolution with an increasing temperature in 001]-oriented KNN single crystal was observed using polarized light microscopy (PLM), where three distinguished changes of the domain structures were found to occur at −150 C, 213 C and 400 C, corresponding to the three phase transition temperatures. |
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| Keywords: | A Ferroelectrics D Optical properties D Phase transitions D Piezoelectricity |
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