Influence of the sintering temperature on the Sr content in a Ca(1−x−y)CexSryAlzTi(1−z)O3 perovskite (x = 0.04–0.16) co-doped with Ce

Abstract

A Sr-Ce co-doped perovskite, with the chemical formula: Ca(1−x−y)CexSryAlzTi(1−z)O3 (y = 0.04, 0.08, 0.12 and 0.16, x = 0.05) is synthesized by sol–gel process. The influence of the sintering temperature, Ts, on the rate of inserted Sr was investigated at 1223, 1373 and 1473 K.The Sr amount sequestered in the perovskite reaches 85% (y = 0.16, 9.50 wt%) for Ts = 1373 K, giving sintering densities between 3.520 and 4.400. XRD analysis reveals an orthorhombic CaTiO3 structure. The lattice parameters obey to Vegard’s law for Ts = 1373 and 1473 K. SEM analysis shows orthorhombic grains of 0.514 μm × 1 μm mean dimensions.MCC1 and MCC2 tests, performed on minerals sintered at 1373 K, indicate that the most durable one is that containing 9.50 wt% Sr. MCC1 test gave 6.998·10−6 g/cm2 d of Sr, and MCC2 2.143·10−4 g/cm2 d of Ce. The temperature favors the Sr dissolution to the detriment of Ce. The Ca dissolution rate reaches 1.002·10−6 to 2.005·10−6 g/cm2 d.