Abstract
A complex impedance of oxyapatites Ca2-xBaxLa4Bi4(SiO4)(6)O-2 (0 <= x <= 2) prepared by solid state reaction has been investigated. The formation of apatites has been checked by X-ray diffraction,FTIR, Raman and Si-29 MAS-NMR techniques. The electric impedance data indicate that relaxation phenomena are strongly dependent on temperature in the 923-1048 K range. The bulk resistance decreases with increasing temperature, showing a typical negative temperature coefficient of resistance (NTCR). ac-Conductivity measurements have been performed on a wide range of frequencies and temperatures. The complex modulus plots have confirmed the presence of bulk contributions. The complex impedance analysis suggests the presence of non-Debye relaxations that would be associated with correlation on ions motion. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.