Piezoelectric properties of Na_1−xK_xNbO_3, near x = 0.500 morphotropic phase region

Abstract

Sodium-potassium niobate (Na_1-xK_xNbO₃) ceramic pellets were prepared, near equimolar Na- K composition, by solid state reaction method with double sintering. Remnant polarization, coercive field, polarization current and converse piezoelectric coefficient (d*₃₃) of the prepared samples were measured. The observed properties exhibit strong composition dependence- a morphotropic phase transition type behavior, showing extremal piezoelectric properties for potential lead free transducer applications, at the composition with x = 0.500.

Keywords:

• Ferroelectric
• perovskite
• remnant polarization
• converse piezoelectric coefficient (d*₃₃
• )
• morphotropic phase transition