Author:
Popov A. M.,Sekushin N. A.,Макееv B. A.,Sеlyutin A. A.,Zhuk N. A.
Abstract
Lead-containing perovskite of complex composition PbNaKNb2FeO9.5 (sp. gr. Pnma, a = 5.654 ± 0.003 ?, b = 7.977 ± 0.001 ?, c = 5.646 ± 0.003 ?) was synthesized for the first time by the solid-phase reaction method. The sample is characterized by a non-porous microstructure formed by randomly oriented cubic crystallites. The band gap (?2.10 eV) of a complex perovskite for a direct allowed electronic transition was calculated from the data of the diffuse reflectance spectrum. The permittivity of the sample at room temperature and a frequency of 106 Hz reaches 1365, and the dielectric loss tangent is 0.1.
Publisher
Izdatel'skii dom Spektr, LLC