Ferroelectric relaxor behaviour of Na0.5Bi0.5TiO3–SrTiO3 ceramics

TLDR: In this paper, the search for alternative ferroelectric materials is now being focused on alkali niobates, modified bismuth titanates and systems in which a morphotropic phase boundary (MPB) will occur.

Abstract: Investigations of ferroelectric perovskite-type compounds with different distributions of the 6-fold or 12-fold coordination cations are more and more being increased as these materials are involved in the fabrication of many devices, e.g. capacitors, piezoelectric ultrasonic tranducers, electrostrictive actuators, SAW substrates, etc [1–3]. However, most of these materials are made from lead-bearing compounds, e.g. lead zirconate titanate (PZT), lead magnesium niobate (PMN), etc. So for environmental, health and social reasons, manufacturers are more and more constrained to reduce and ultimately eliminate the lead content from their materials. The search for alternative ferroelectric materials is now being focused on alkali niobates, modified bismuth titanates and systems in which a morphotropic phase boundary (MPB) will occur, that is bi- or multiphase systems in which one of the end phases is tetragonal and the other trigonal. Among them the perovskite-like sodium bismuth titanate Na