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Dielectric and piezoelectric properties of Mn‐doped (K,Na) 0.96 Sr 0.02 NbO 3 ceramics
Author(s) -
Liu T.,
Ding A. L.,
He X.Y.,
Zheng X. S.,
Qiu P. S.,
Cheng W. X.
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622321
Subject(s) - materials science , dielectric , analytical chemistry (journal) , doping , sintering , dissipation factor , ceramic , mineralogy , mixed oxide , diffraction , oxide , chemistry , composite material , metallurgy , optics , physics , optoelectronics , chromatography
Dense, lead‐free ceramics with composition of (K 0.5 Na 0.5 ) 0.96 Sr 0.02 Nb 1– x Mn x O 3 ( x = 0, 0.01, 0.02, 0.03, 0.04) were successfully prepared by a conventional mixed‐oxide method. The X‐ray diffraction patterns revealed pure peroveskite structure after Mn doping as compared to the original composition. This was attributed to the inhibition of K + volatility during the sintering process. A dielectric anomaly was observed and explained by a multiple‐cell structure resulting from Mn‐induced lattice distortion. Low loss tangent and relatively high planar electromechanical coupling factor were obtained at x = 0.02. The main parameters for the composition of x = 0.02 are: ε T 33 / ε 0 = 479, d 33 = 121 pC/N, K p = 41%, Q m = 298, tan δ = 1.6%, T c = 391 °C. The rates of resonant frequency variation, α f r, and planar coupling factor variation, α K p, with a temperature of 80 °C are –1.85% and +1.19%, respectively. This material may be suitable for applica‐ tions in ultrasonic transducers. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)