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It was shown that ZrO2 nanopowders and nanoceramics can be used as an optical oxygen sensor, where the luminescence signal is proportional to the partial oxygen pressure in gases. The nanopowders were obtained in a hydrothermal microwave driven process followed by annealing at 750??C. Nanoceramics were obtained by sintering at pressures up to 6 GPa and at 250??C so that grain growth did not occur...
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