Abstract
High-temperature water vapor corrosion behavior of Lu 4Hf 3O 12 was studied at 1500 °C in 30 wt.% H 2O environment for 50 h. The rate of weight loss for this sample during the corrosion test was 1.347×10 −6 g/cm 2 h. On the surface of corrosion-tested specimen, a localized smooth surface was observed in some places and the grain boundary interface was covered by other phase that appears like string shape. The melted phase when measured by EDX method contained 37.2 mol% of Lu 2O 3 that was slightly lower than that of Lu 2O 3 content in Lu 4Hf 3O 12 stoichiometric composition. And the Lu 2O 3 content of the string like melted phase was as higher as 53.7 mol% revealing a Lu-rich composition. The X-ray diffraction analysis of the after corrosion-tested sample showed very small peaks corresponding to melted phase.
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