Funktionsmaterialien mit Perowskit-Struktur

Abstract

Perovskites have the general composition ABX₃, where A and B are cations of different size, and X is an anion. The basic structure consists of corner-sharing [BX₆] octahedra, with the larger cations A located in the holes of the BX₃ network. This structure can be varied in numerous ways, resulting not only in a rich structural chemistry, but also in diverse possibilities for deliberately influencing physical properties und hence applications of perovskites. This is exemplified with compounds having piezoelectric (BaTiO₃ and PbZr_0.48Ti_0.52O₃ [PZT]) or optoelectronic properties (such as APbX₃ with A = Cs or organic cations, X = Cl, Br, I).