Effect of deuteration on phase transitions in (NH4)3VOF5
Bogdanov E.V.1,2, Bondarev V.S.1,3, Gorev M.V.1,3, Molokeev M.S.1,3, Flerov I.N.1,3
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
2Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk, Russia
3Siberian Federal University, Institute of Engineering Physics and Radio Electronics, Krasnoyarsk, Russia
Email: evbogdanov@iph.krasn.ru

The (ND4)3VOF5 crystal was grown with a high degree of deuteration (D~92%). Structural and thermophysical studies have been carried out, the parameters of phase transitions have been determined. It was found that the deuteration of the ammonium cation in (NH4)3VOF5 led to a change in the chemical pressure, which was accompanied by an increase in the unit cell volume and an increase in the phase transition temperatures. The baric coefficients dTi/dp were determined and the phase T-p diagram (ND4)3VOF5 was constructed. A decrease in the temperature stability of the initial cubic phase Fm3m in (ND4)3VOF5, as well as a wedging out of the intermediate monoclinic phase at a lower pressure as compared to (NH4)3VOF5, was found. Keywords: oxyfluorides, phase transitions, heat capacity, thermal expansion, pressure.
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