Impact of Free Charges on Polarization and Pyroelectricity in Antiferrodistortive Structures and Surfaces Induced by a Flexoelectric Effect

摘要

Landau-Ginzburg-Devonshire theory has been used to show that the combined effect of flexoelectricity and rotostriction can lead to a spontaneous polarization and pyroelectricity in the vicinity of antiphase boundaries, structural twin walls, surfaces, and interfaces in the octahedrally tilted phase of otherwise non-ferroelectric SrTiO₃. In particular, the spontaneous polarization reaches the values 0.1-5??C/cm2 at the SrTiO₃ antiphase boundaries and twins without free charges. In the current study we consider the contribution of free charges and show that the spontaneous polarization reaches the values 1-5??C/cm2 in the case. Pyroelectric coefficients also strongly increase allowing for the free charges.View full textDownload full textKeywordsFlexoelectric effect, antiferrodistortive phase, antiphase and twin boundariesRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; var addthis_config = {"data_track_addressbar":true,"ui_click":true}; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00150193.2012.744257