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Lattice constants for three samples of tetragonal ZrO2 were measured in high temperature X-ray diffractometer in range 1150 to 1700 C in ambient air atmosphere; materials were hafnia-free pure ZrO2 and reactor grade hafnia-free pure ZrO2 from different sources; it was believed that all were prepared from sulfate and that each had received different heat treatment by supplier. Before Research in Progress Conference on Zirconia at Aerospace Research Laboratories, Wright Patterson Air Force Base, Dec 1962.