Ferroelectric Sb-doped PMN-PT crystal: high electromechanical response with true-remanent polarization and resistive leakage analyses
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In this work, pure and Sb-doped PMN-PT (64:36) crystals with pure perovskite phase have been successfully grown using high temperature solutions technique (or, flux technique), in the vicinity of MPB with the size of the crystals varying from 2 × 2 × 1 mm3 to 7 × 5 × 4 mm3. Various properties like dielectric, piezoelectric, ferroelectric and pyroelectric were investigated for the Sb-doped PMN-PT crystals and have been compared to that of pure PMN-PT crystals. In the dielectric studies, the Curie temperature (Tc) for the pure and doped crystal was found to be 190 °C and 155 °C, respectively. Butterfly loops were traced from which a high value of the piezoelectric coefficient for Sb-doped crystal (d33* = 1972 pm/V) was revealed in the voltage range 250–500 V which was fairly greater than that observed for pure PMN-PT crystal (d33* = 1413 pm/V). The Sb-doped PMN-PT crystals displayed excellent saturated ferroelectric hysteresis loops with higher remanent polarization (Pr) value compared to the pure PMN-PT crystals. The doped crystals also displayed good fatigue resistant characteristic indicating the high ferroelectric quality of the crystals. The true or usable polarization (Ptr) component was extracted using the “True-remanent hysteresis” task. The value of Ptr was found to be 41.53 µC/cm2 suggesting lesser contributions (~ 7%) from non-remanent (non-switchable) components of polarization further confirming the good ferroelectric quality of the Sb-PMN-PT crystals. Also, the resistive-leakage characteristic of the doped crystal was analyzed using Time-dependent compensated hysteresis task. These results demonstrate that the Sb-doped PMN-PT crystal possesses excellent properties to achieve a variety of applications.
We are thankful for the financial support received through the DRDO Project (ARMREB/MAA/2015/163) and DST Project (EMR/2015/000385). Abid Hussain and Sahil Goel would like to thank CSIR for providing the Senior Research Fellowship (File No. 09/045(1413)/2016-EMR-I and 09/045(1406)/2015-EMR-I). Dr. Nidhi Sinha expresses her gratitude to the Principal, SGTB Khalsa College for encouragement and support for research work.
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