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A Synchrotron X‐ray Study of Ferroelectric Switching, Domain Reversal and Piezoelectric Moduli in CsTiOAsO 4 , Under an Applied Electric Field
Author(s) -
Bolt R.,
Albertsson J.,
Svensson G.,
Ståhl K.,
Hanson J. C.
Publication year - 1997
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889897000708
Subject(s) - piezoelectricity , electric field , ferroelectricity , polarizability , coercivity , materials science , single crystal , crystallography , synchrotron , potassium titanyl phosphate , polar , dipole , field (mathematics) , nuclear magnetic resonance , optics , condensed matter physics , chemistry , dielectric , physics , optoelectronics , laser , mathematics , organic chemistry , quantum mechanics , astronomy , molecule , pure mathematics , composite material
Single crystals of caesium titanyl arsenate (CTA, CsTiOAsO 4 ), with space group Pna 2 1 and isomorphous with potassium titanyl phosphate (KTP, KTiOPO 4 ), have been studied using high‐resolution synchrotron X‐rays. During the experiments, an electric field was applied along the polar axis [001]. Single‐crystal plates, between 300 and 450 μm thick along [001], were polarized by a variable square wave of frequency 20 Hz alternately applied to each side of the plate. A field‐induced splitting of the + /− peaks for reflections hkl with l ≠ 0 was observed. This splitting provides information about the coercive field, polarizability and the piezoelectric strain tensor. Two of the piezoelectric coefficients of CTA could be estimated as d 31 ≃ 1 and d 33 ≃ 27 pm V −1 . Whereas the coercive fields were estimated at 2300 V mm −1 , the field necessary to reverse the domains just once in CTA was found to be either 560 or 1550 V mm −1 , depending on the polarity of the reversed domain in relation to the polarity of the nonswitched part of the crystal.