THERMAL-SHOCK BEHAVIOR OF ZRO2-MGO SOLID ELECTROLYTES

Thermal shock studies have been undertaken in MgO-stabilized ZrO2 soli d electrolytes prepared from powders obtained by the citrate technique . impedance spectroscopy and X-ray diffraction analyses have been carr ied out in sintered pellets before and after thermal shock at 1600 deg rees C to study phase changes. Scanning electron microscopy observatio ns have also been performed. Thermal shock leads to a large increase i n the cubic(tetragonal)-to-monoclinic phase ratio with a corresponding modification in the hulk conductivity value of the zirconia-magnesia solid electrolytes. (C) 1998 Elsevier Science B.V.