Abstract
As operating temperatures of engines or turbines continually increase for higher efficiency, significant amounts of researches have been focused on finding new materials, which would be alternatives to conventional yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs). In this study, phase evolution and thermo-physical properties of <TEX>$La_2(Zr_{1-x}Hf_x)_2O_7$</TEX> pyrochlore systems are investigated for TBC applications. <TEX>$La_2(Zr_{1-x}Hf_x)_2O_7$</TEX> systems are comprised by selecting <TEX>$La^{3+}$</TEX> as A-site ions and <TEX>$Zr^{4+}/Hf^{4+}$</TEX> as B-site ions in <TEX>$A_2B_2O_7$</TEX> pyrochlore structures. For the developed phases in <TEX>$La_2(Zr_{1-x}Hf_x)_2O_7$</TEX> compositions, thermo-physical properties such as thermal conductivity, thermal expansion coefficient are examined. The potential of these <TEX>$La_2(Zr_{1-x}Hf_x)_2O_7$</TEX> compositions for TBC application is also discussed.
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