The quenching effects for depolarization temperature of (Bi0.5Na0.5)TiO3 ceramics with Mn dopants.

Authors :: Eguchi, Kohtaro
Takagi, Yuka
Nagata, Hajime
Takenaka, Tadashi
Source :: Japanese Journal of Applied Physics; Nov2020, Vol. 59 Issue SP, p1-7, 7p
Publication Year :: 2020
Abstract: Lead-free ferroelectric and piezoelectric ceramics, (Bi<subscript>0.5</subscript>Na<subscript>0.5</subscript>)TiO<subscript>3</subscript> (BNT), with Mn dopants were prepared by a quenching procedure after sintering to examine the depolarization temperature T<subscript>d</subscript>, and then their electrical properties were investigated. The T<subscript>d</subscript> of quenched BNT + xMn (Mn x) decreased with Mn doping. Also, the T<subscript>d</subscript> of quenched Mn x was ∼60 °C higher than that of ordinary firing (OF) samples. Furthermore, the difference of T<subscript>d</subscript> (ΔT<subscript>d</subscript>) between the OF and the quenched process increased with increasing of the Mn-substituted amount. The electromechanical coupling factors k<subscript>33</subscript> of Mn x exhibited the same value after quenching. The coercive electric field E<subscript>c</subscript> was increased from 62 to 95 kV cm<superscript>−1</superscript> with increasing of Mn-substituted amount. Thus, the quenching procedure is an effective way of elevating the T<subscript>d</subscript> of Mn-doped BNT-based solid solution systems. [ABSTRACT FROM AUTHOR]

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