This paper presents experimental data on study of aging nanostructured and tetragonal single-phased 2.5 mol % Y 2 O 3 -doped ZrO 2 ceramics at 250°C for 1000 h in a steam atmosphere. An excellent stabilization of tetragonal zirconia polycrystalline ceramics was obtained contrary to the present literature, probably due to favorable microstructural characteristics of the materials. In situ impedance and Raman spectroscopies have been coupled to correlate the electrical properties and phase content in order to provide new insight into the mechanism of monoclinic degradation.
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Djurado et al. (2004) studied this question.
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