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High Power Performance of Manganese‐Doped BNT ‐Based Pb‐Free Piezoelectric Ceramics
Author(s) -
Hejazi Mehdi,
Taghaddos Elaheh,
Gurdal Erkan,
Uchino Kenji,
Safari Ahmad
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13098
Subject(s) - materials science , ceramic , doping , piezoelectricity , manganese , dielectric , analytical chemistry (journal) , composite material , mineralogy , metallurgy , optoelectronics , chemistry , chromatography
Electromechanical properties and high power characteristics of Pb ‐free hard piezoelectric ceramics in the ( BiN a 0.88 K 0.08 Li 0.04 ) 0.5 ( Ti 1− x Mn x ) O 3 ( x = 0, 0.014, 0.015, and 0.016) system were studied. Mn doping resulted in a considerable enhancement of mechanical quality factor Q m and vibration velocity. The lowest mechanical and dielectric losses were achieved in 1.5 mol% Mn ‐doped ceramics with a planar Q m of about 970 and tanδ of 0.89%. The heat dissipation and resonance frequency shift under high drive condition were remarkably suppressed upon Mn doping. The maximum vibration velocity was increased from 0.28 m/s in undoped ceramic to 0.6 m/s in 1.5 mol% Mn ‐doped composition. The results of this study revealed that Mn ‐doped BNT ‐based piezoelectrics exhibited a superior high power performance compared to their lead‐based counterparts such as PZT 4 and PZT 8 ceramics.