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XRD patterns of (A) ZTA (70/30) and (B) ATZ (80/20) before (green, top) and after (orange, bottom) autoclave aging for 20 h at 134 °C under 2.2 bars of pression. While the high hydrothermal stability of ZTA is observed with almost no modifications in the diffractogram after aging, a limited amount of phase transformation is depicted in ATZ after aging. Letters represent (m) monoclinic peaks, (t) tetragonal peaks, (c) cubic peaks, and (α) alpha alumina peaks.
