Oxide dielectrics

Abstract

Three aspects of oxide dielectrics are covered (i) structure engineering: making use of crystal structure and crystal chemistry, the dielectric behaviour can be finely tuned, as illustrated in the systems (Ba, Pb) (Ti, Zr)0₃ and (Ba, Pb) (Ti, Nb)O₃ studied by Biswas. (ii) Defect structure: control of defect structure of Mn-doped BaTiO₃ inhibits the reduction of BaTiO₃ in reducing atmospheres at high temperatures thus making the use of base metal electrodes possible in manufacturing ceramic capacitors. (iii) Composites: Diphasic composites of oxide dielectrics with other materials may be utilized for producing voltage stable capacitors and dense or flexible piezoelectrics with outstanding properties.