Abstract
A low-temperature rhombohedral-tetragonal morphotropic phase boundary (MPB) is discovered using a phenomenological approach in PbxSr1-xTiO3. Monoclinic structures are readily induced under electric field around the MPB which can be up-shifted to near room temperature by applying a negative pressure. Field-induced phase transition, polarization change, and dielectric response are computed. Under stress-free conditions monoclinic-orthorhombic transition can be induced in Pb0.5Sr0.5TiO3 by applying an electric field, giving rise to stronger field dependence of room-temperature dielectric constants as compared to Pb0.2Sr0.8TiO3. Under negative pressure, however, in Pb0.2Sr0.8TiO3 cubic-tetragonal transition can be induced, around which dielectric anomaly is sensitive to electric field, enabling significant enhancement of dielectric tunability.
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