Temperature-Dependent Phase Transition in Orthorhombic [011]c Pb(Mg1/3Nb2/3) O3-0.35PbTiO3 Single Crystal

Crystals

Wenhui He¹  Qiang Li¹  Qingfeng Yan¹  Nengneng Luo¹  Yiling Zhang²  Xiangcheng Chu² 

[1] Department of Chemistry, Tsinghua University, Beijing 100084, China; E-Mails:;State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China; E-Mails:

关键词: temperature-dependent phase transition;    orthorhombic [011]_c PMN-0.35PT;    dielectric properties;    piezoelectric properties;    P-E hysteresis loops;    S-E hysteresis loops;   

DOI  :  10.3390/cryst4030262

来源: mdpi

【 摘 要 】

Relaxor [011]_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 (P_r), coercive field (E_c), saturation polarization (P_s), hysteresis loop squareness (R_sq), and longitudinal piezoelectric constant () are also explored to learn the details of the phase transitions. Variable temperature unipolar S_uni-E hysteresis loops avail additional evidence for the microstructure change in the as-measured single crystal.

【 授权许可】

CC BY   
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