Abstract
Using the method of solid-state reaction technique, (Y, Mn) modified Bismuth ferrite ferroelectric ceramic Bi0.8Y0.2(Fe0.5Mn0.5)O3 is prepared. The room temperature XRD analysis confirms the formation of a new single-phase compound with an orthorhombic crystal structure. The electrical properties are analyzed by the impedance analyzer. Through analysis, the dielectric behavior of the compound is explored in broad temperature and frequency span, which shows the strong temperature & frequency dependence characteristics of the compound. The high transition temperature of the parent bismuth ferrite compound (∼830 °C) markedly reduces to 370 °C when Y is substituted at A site and Mn at B site. Temperature-dependent behavior of conductivity and activation energy values estimated in different regimes are calculated from the temperature-dependent ac conductivity graphs, which suggests that the conduction process is of mixed type (i.e. ionic-polaronic and space charge generated from the oxygen ion vacancies). The ac conductivity spectrum obeys Jonscher’s universal power law.
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