Abstract: Relaxor c PMN-0.35PT single crystal phase transition characteristics are investigated through various methods including variable temperature dielectric properties, X-ray diffraction, bipolar ferroelectric hysteresis loops (P-E) and electric-field-induced strain (S-E) hysteresis loops measurements. The results reveal that two phase transitions exist within the range from room temperature to 250 °C: orthorhombic (O)-tetragonal (T)-cubic (C). The O-to-T and T-to-C phase transition temperatures have been identified as 84 °C and 152 °C, respectively. Diffuseness degree of the T-to-C phase transition for the unpoled single crystal has been calculated to be 1.56, implying an intermediate state between normal and relaxor ferroelectrics. Temperature-dependent remanent polarization (Pr), coercive field (Ec), saturation polarization (Ps), hysteresis loop squareness (Rsq), and longitudinal piezoelectric constant (d* 33) are also explored to learn the details of the phase transitions. Variable temperature unipolar Suni-E hysteresis loops avail additional evidence for the microstructure change in the as-measured single crystal.
Keywords: temperature-dependent phase transition; orthorhombic c PMN-0.35PT; dielectric properties; piezoelectric properties; P-E hysteresis loops; S-E hysteresis loops
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He, W.; Li, Q.; Yan, Q.; Luo, N.; Zhang, Y.; Chu, X.; Shen, D. Temperature-Dependent Phase Transition in Orthorhombic c Pb(Mg1/3Nb2/3) O3-0.35PbTiO3 Single Crystal. Crystals 2014, 4, 262-272.
He W, Li Q, Yan Q, Luo N, Zhang Y, Chu X, Shen D. Temperature-Dependent Phase Transition in Orthorhombic c Pb(Mg1/3Nb2/3) O3-0.35PbTiO3 Single Crystal. Crystals. 2014; 4(3):262-272.
He, Wenhui; Li, Qiang; Yan, Qingfeng; Luo, Nengneng; Zhang, Yiling; Chu, Xiangcheng; Shen, Dezhong. 2014. "Temperature-Dependent Phase Transition in Orthorhombic c Pb(Mg1/3Nb2/3) O3-0.35PbTiO3 Single Crystal." Crystals 4, no. 3: 262-272.