Structure and dielectric properties of B-substituted lanthanum nickelates

Abstract

Structure and dielectric properties of B-substituted lanthanum nickelates

Chupahina T.I., Melnikova N.V., Kabirov Yu.V., Gavrilyachenko V.G., Guda A.A., Chebanova E.V., Rusakova E.B.

Incoming article date: 03.05.2015

Ceramic materials based on solid solutions La2-xSrxMO4, where M is Ni, Fe, Co, Cu, x = 0, 2 with layered K2NiF4 structure (structure of Ruddlesden-Popper) have been synthesized and investigated. The correlation of dielectric properties with a normalized bond lengths of the metal-oxygen has been observed. The existence of nickel atoms in the 2+ oxidation state for nickelates has been shown.

Keywords: solid solutions, colossal dielectric constant, resistivity, x-ray diffraction, dielectric spectrum, XANES, low-resistivity semiconductors, the activation energy, the distortion of the coordination polyhedra, oxygen non-stoichiometry