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Structural Transition and Electrical Properties of (1 − x)(NaKBi)TiO-xSrTiO Lead-Free Piezoceramics

Journal of Electronic Materials, ISSN: 0361-5235, Vol: 46, Issue: 10, Page: 5553-5562
2017
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(1 − x)(NaKBi)TiO-xSrTiO (NKBT-xST) ceramics with x = 0 mol.%, 3 mol.%, and 5 mol.% (0ST, 3ST, and 5ST) have been prepared by a conventional solid-state reaction method and their ferroelectric, electrostrictive, and pyroelectric properties investigated. Addition of ST considerably disrupted the long-range ferroelectric order of NKBT-xST ceramics, and the 5ST ceramic exhibited ergodic relaxor phase structure. T shifted to near or below room temperature for 5ST ceramic, accompanied by a significant decline of ferroelectricity and enhanced strain. As the temperature approached T, the NKBT-xST ceramics exhibited predominantly electrostrictive effect, and the 5ST ceramic presented relatively high electrostrictive coefficient Q of 0.0193 m/C. High pyroelectric response was observed for 0ST, 3ST, and 5ST ceramics in the vicinity of T due to the large polarization release during the ferroelectric–relaxor structural transition. The 5ST ceramic exhibited high and frequency-insensitive (100 Hz to 10 kHz) room-temperature pyroelectric properties with pyroelectric coefficient p of 656 μC m K and figures of merit F, F, and F reaching 233 pm/V, 0.013 m/C, and 7.61 μPa, respectively, indicating that 5ST ceramic is a promising candidate to replace PZT-based ceramics.

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