Phase transition type giant negative thermal expansion materials

Abstract

Negative thermal expansion materials are expected to be utilized for control of the thermal expansion of structure materials in the fields of semiconductor manufacturing, optical devices and precise machining where precise positioning is required. In this review, giant negative thermal expansions in PbVO₃ derivatives induced by ferroelctric-paraelectric transition and in modified BiNiO₃ induced by intermetallic charge transfer will be discussed.