ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Influence of the B-site cation nature on dielectric properties of Ca₂XBiO₆ (X = Dy, Fe, Al) double perovskite

Simona Feraru, Petrisor Samoila, Valentin Nica, Alexandra R. Iordan, and Mircea N. Palamaru

Faculty of Chemistry, cFaculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania

E-mail: palamaru@uaic.ro

Abstract: For the synthesis of Ca₂XBiO₆ (X = Dy, Fe, Al) metal oxides with ordered double-perovskite structure, the sol-gel auto-combustion method has been used for the first time. The synthesis progress was followed by the Fourier transform infrared spectroscopy and the samples structure was investigated by X-ray diffraction. The samples morphology was studied by means of scanning electron microscopy. The influence of the nature of the trivalent B-site cation on the dielectric properties was evaluated by resistivity measurements in vacuum at frequencies between 10²–10⁵ Hz. The best dielectric behavior was obtained for Ca₂AlBiO₆ and Ca₂DyBiO₆, while the best semiconductor behavior was found for Ca₂FeBiO₆.

Keywords: sol-gel auto-combustion – double perovskite – dielectrics – semiconductors

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-013-0394-9

Chemical Papers 67 (10) 1311–1316 (2013)