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HomeMaterials Science ForumMaterials Science Forum Vol. 848Sb5+ Modified Phase Transition in (Li, Na,...

Sb⁵⁺ Modified Phase Transition in (Li, Na, K)(Nb_1-xSb_x)O₃ Piezoelectric Ceramics

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Abstract:

The modified behavior of the phase transition temperatures (T_O-T and/or T_C) between orthorhombic (O), tetragonal (T) and cubic (C) that caused by doping Sb⁵⁺in (Li_0.052Na_0.493K_0.4₅₅)(Nb_1-_xSb_x)O₃ (LNKNS_x) ceramics was reported in the present investigation. The results show that differing from the insensitive T_O-T to the Sb⁵⁺ content, T_C splits into two peaks T_C^I and T_C^II when doping Sb⁵⁺. The decreased T_C^I by raising x may be ascribed to the Sb-rich grains and the settled T_C^II round 480 °C resulting from the Sb-lack ones. The enhanced piezoelectric coefficient d₃₃ value of 263 pC/N and planar mode electromechanical coupling coefficient k_p value of 42.5% at x=0.052 can be attributed to the polymorphic phase boundary (PPB) behavior with an appropriate ratio between T and O phases without any second phase.

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Materials Science Forum (Volume 848)

Pages:

339-343

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.848.339

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Online since:

March 2016

Authors:

Xiao Kun Zhao, Bo Ping Zhang*, Lei Zhao, Li Feng Zhu

Keywords:

Ceramics, Electrical Properties, Phase Transformation, Piezoelectric Materials

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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