Comparative studies of structural and electrical properties of yttrium iron manganites prepared by ceramic method and sol-gel auto combustion method

ABSTRACT

Polycrystalline yttrium iron manganites – YMn_1-xFe_xO₃ (with x = 0.0, 0.1, 0.15, 0.20) were synthesized by ceramic method and sol-gel auto-combustion method. XRD confirmed the formation of hexagonal phase in all samples. The hexagonal a– and c- parameters for the samples prepared by the sol-gel method are found to be closer to the stoichiometric values. The room temperature frequency variation of electrical properties such as dielectric constant, dielectric loss and ac conductivity showed a dispersive behavior for all the samples. The values of dielectric constant and dielectric loss are found to be lower for the sol-gel prepared samples.

KEYWORDS:

• Yttrium manganites
• hexagonal phase
• dielectric constant
• a. c. conductivity