Electric field induced structural transformations across the morphotropic phase boundary of (1-x)Bi(Mg1/2Ti1/2)O3-xPbTiO3 piezoceramics

Abstract

Structural investigation of electric field poled (1-x)Bi(Mg1/2Ti1/2)O3-xPbTiO3 piezoceramics across morphotropic phase boundary reveals significant modifications in crystal structure. Tetragonal compositions show domain extension and domain reorientation along c-axis. The compositions having coexisting tetragonal and monoclinic phases in the unpoled state exhibit modification in relative proportion of the two phases in addition to domain reorientation and extension. The pseudocubic monoclinic phase outside the phase coexistence region undergoes isostructural phase transformation to long range monoclinic phase with significantly larger lattice parameters than that in the unpoled state. After poling pseudocubic compositions exhibit highest polarization due to transformation into long range monoclinic structure. © 2016 Elsevier Ltd. All rights reserved.