Silicates and perovskites: Two themes with variations

Abstract

An intermediate position between oxosilicates and nitridosilicates on one side and silicates and silicon oxo salts on the other is taken up by Ce16Si15O6N32. This compound is a perovskite derivative in which the octahedrally coordinated cations have been extensively replaced by tetrahedrally coordinated cations to give the formula Ce16(Si([6])Si14/([4])(square)(O6N(32 square 10)) (([n]) = coordination number, square = lattice vacancy). The presence of vacancies in both the cation and the anion sublattices leads to expectations of ionic conductivity.