Thermophysical Properties of Gd₂O₃ Doped SrHfO₃ Ceramic

Abstract

Gd2O3 (10mol%) doped SrHfO3 (Sr (Hf0.9Gd0.1)O2.95) was synthesized by solid state reaction method. The phase stability of the synthesized Sr (Hf0.9Gd0.1)O2.95 powder at high temperature of 1450 oC for a long period and in a temperature range of RT-1400 oC was characterized by XRD and DSC, respectively. The thermal expansion coefficients (TECs) of bulk Sr (Hf0.9Gd0.1)O2.95 were recorded by a high-temperature dilatometer, indicating that the phase transitions of SrHfO3 are suppressed remarkably by doping Gd2O3. The thermal conductivity of bulk Sr (Hf0.9Gd0.1)O2.95 at 1000 oC is ~1.95 W/m·K, which is ~11% lower than that of bulk 8YSZ.

WITHDRAWN: Synthesis and Characterization of SrHfO3 Co-doped with Gd2O3 and Yb2O3 (SHGY)

“…XRD characterization is done for the synthesized powder SHGY was annealed at 1450ºC temperature and 3ºC/ min rate of increase for 24hours for 3 times to form a single phase. The obtained XRD pattern of SHGY compared with the standard pattern of orthorhombic SrHfO 3 PDF code 00-045-0211 and the results is also validated with X'pert High score software and observed the same with the literature [19]. This result can be appreciated that no intermediate phase has been noticed, all the peaks in the XRD data re ects SrHfO 3 phase.…”

“…To overcome these problems further research has been done by adding dopants materials in SrHfO 3 . By this thermal conductivity is reduced leaving no change in the thermal expansion coe cient (CTE) between topcoat and substrate [17][18][19]. Lesser valves of CTE lead to high thermal mismatches between the surfaces.…”