Phase evolution and dielectric/ferroelectric properties of KTa0.67Nb0.33O3 single crystal
作者： Xiaojie Zheng , Hongyang Zhao , Xuping Wang , Bing Liu , Jianding Yu
DOI: 10.1016/J.CERAMINT.2015.03.141
关键词: Thermal expansion 、 Raman spectroscopy 、 Crystallography 、 Phase transition 、 Polarization (electrochemistry) 、 Materials science 、 Ferroelectricity 、 Single crystal 、 Hysteresis 、 Dielectric
摘要: Abstract High quality KTa 0.67 Nb 0.33 O 3 (KTN) single crystal has been grown by the Czochralski method. Three phase transitions Rhombohedral-to-Orthorhombic ( R – ), Orthorhombic-to-Tetragonal T ) and Tetragonal-to-Cubic C were observed using temperature-dependent Raman spectra, thermal expansion, dielectric measurements. The transition temperatures determined spectra are close to those i.e., at 175 K, 210 K, 250 K. While measurements showed that , occur 192, 223, 265 K, respectively. properties of KTN obeys Curie–Weiss law 0 =260 K) above 265 K. At 77 K, typical polarization–electric P E hysteresis loops observed, largest remnant polarization is 15 μC/cm 2 .
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