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Crystals 2014, 4(3), 262-272; doi:10.3390/cryst4030262
Article

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

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1 Department of Chemistry, Tsinghua University, Beijing 100084, China 2 State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
* Author to whom correspondence should be addressed.
Received: 29 April 2014 / Revised: 9 June 2014 / Accepted: 25 June 2014 / Published: 11 July 2014
(This article belongs to the Special Issue Piezoelectric Crystals)
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Abstract

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 (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 [011]c PMN-0.35PT; dielectric properties; piezoelectric properties; P-E hysteresis loops; S-E hysteresis loops temperature-dependent phase transition; orthorhombic [011]c PMN-0.35PT; dielectric properties; piezoelectric properties; P-E hysteresis loops; S-E hysteresis loops
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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He, W.; Li, Q.; Yan, Q.; Luo, N.; Zhang, Y.; Chu, X.; Shen, D. Temperature-Dependent Phase Transition in Orthorhombic [011]c Pb(Mg1/3Nb2/3) O3-0.35PbTiO3 Single Crystal. Crystals 2014, 4, 262-272.

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