Premium
Direct Current Bias Aging Effects in Lead Magnesium Niobate‐Lead Titanate Relaxor Ferroelectric Ceramics
Author(s) -
Pan Wuyi,
Zhuang Qiming,
Cross Leslie E.
Publication year - 1988
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/j.1151-2916.1988.tb05770.x
Subject(s) - materials science , poling , ferroelectricity , dc bias , polarization (electrochemistry) , condensed matter physics , lead titanate , dielectric , titanate , ferroelectric ceramics , doping , dipole , mineralogy , ceramic , composite material , voltage , optoelectronics , chemistry , electrical engineering , physics , organic chemistry , engineering
The effect of aging upon the dielectric properties of MnO‐doped lead magnesium niobate‐lead titantate (0.9PMN·0.1PT) ceramics has been measured for samples aged at room temperature (25°C) both under zero and under high (22 kV/cm) dc fields. In the 0.9PMN·0.1PT composition, 25°C is above the limit for stable remanent polarization, P=0, in the absence of an external field; nonetheless, aging under a high dc bias at 25°C, then cooling to low temperature under zero bias produces a stable remanence at lower temperature and a loss of the dispersive character of the micropolar state. It is suggested that dipolar defects induced by MnO doping in the PMN‐PT can slowly reorient to stabilize the existing domain structure acting like a local bias field. Evidence is presented to show the stabilization of both random (unpoled) and ordered (poled) micropolar states. By comparing the remanent polarization induced by cooling after aging under dc field with that produced by straight dc poling of deaged samples, it appears that the defect ordering is macroscopically equivalent to a field of order 2 kV/cm. This field is in rough accord with the field to be expected from the known defect concentration, when the defects are ordered.