Abstract
The hydride-fluoride pyrochlore NaCaMg2F7−xHx has been synthesized at high pressure (2 GPa) from binary fluorides and hydrides. Contrary to initial expectations, we did not find strong evidence of selective hydride substitution in special anionic sites. F-center formation under UV irradiation at room temperature was observed, demonstrating the potential lability of hydride and enabling further systematic studies.
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