Electromechanical Determination of the High‐Field Phase Transition of Pb(Mg1/3Nb2/3)O3–PbTiO3–(Ba,Sr)TiO3Relaxor Ferroelectrics
作者:
Steven M. Pilgrim,
Mona Massuda,
Audrey E. Sutherland,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 7
页码: 1970-1974
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb07225.x
出版商: Blackwell Publishing Ltd
关键词: lead magnesium niobate;actuator;electromechanical properties;relaxors;strain
数据来源: WILEY
摘要:
Ceramics in the (1 –x)[(1 –y)Pb(Mg1/3Nb2/3)O3·yPbTiO3] ·xMeTiO3system, where Me is Sr or Ba, exhibit very large electrostrictive strains at reasonable drive fields. However, the optimum use temperature and frequency vary with the particular composition used. As relaxor ceramics, each composition has a broad transition from electrostrictive to partially piezoelectric behavior. The transition temperature (Tt) can be roughly determined from strain or polarization properties; however, it can be more quantitatively determined from the effective electro‐mechanicalQ. A plot of induced transverse strain/induced polarization squared (effectiveQ12) as a function of temperature shows a sharp and unmistakable change in slope—this definesTt. The slope of induced transverse strain/polarization (effective g31) also shows a change in slope atTt, although this is more gradual than that of effectiveQ. The indicatedTtcorrelates with those found from measurement of strain and pol
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