Electrical conductivity studies of nanocrystalline Dy~(3+) doped CaMoO_4 synthesized by sol-gel process

摘要

Oxygen ion conducting solid electrolytes have many device applications such as sensors, solid oxide fuel cells, oxygen pumps, electrochemical reactors and steam electrolysis cells. Among these, solid oxide fuel cells (SOFCs) have attracted great attention in electrochemical devices because of their high energy conversion efficiency, little pollution and widely flexible fuel choices. Scheelite type based oxide ion conducting materials like PbWO_4, BaMoO_4, SrMoO_4 having high ion conductivity compared to others and these can be used as electrolyte for intermediate temperature solid oxide fuel cell (ITSOFC) applications. The present work aims to develop nanocrystalline Dy~(3+) doped CaMoO_4 to increase the ionic conductivity for ITSOFC applications. Nanocrystalline dysprosium doped CaMoO_4 samples were prepared by using acrylamide assisted gel combustion process. All the samples were characterized by TG/DTA, XRD, FTIR and SEM techniques. For the sintered dysprosium doped CaMoO_4 crystalline samples, electrical conductivity were evaluated from the analysis of the impedance plots, obtained at different temperatures.