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Behavior of Metal Difluorides MF2 (M = Ca, Sr, Ba, Cd, Pb) in Sodium Nitrate Melt

  • SYNTHESIS AND PROPERTIES OF INORGANIC COMPOUNDS
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Abstract

The stability of divalent metal fluorides MF2 (M = Ca, Sr, Ba, Cd, and Pb) in a sodium nitrate melt was studied. It was confirmed that fluorides of Ca, Sr, Ba, and Cd do not interact with NaNO3. In all the samples containing PbF2, the orthorhombic compound PbNaF2NO3 (space group P212121) forms, which, when dissolved in water, transforms into an aqueous NaNO3 solution and a low-temperature polymorph of α-PbF2. Some other divalent cations can also enter the structure of PbNaF2NO3. In the PbF2–BaF2–NaNO3 system, another, unidentified, compound forms along with PbNaF2NO3. It was shown that NaNO3 melt can be used as a liquid medium for studying low-temperature phase equilibria in the systems formed by MF2 with M = Ca, Ba, and Sr.

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Funding

The work was supported by the Ministry of Science and Higher Education under a state assignment for the Crystallography and Photonics Federal Research Center (CPFRC), Russian Academy of Sciences, Moscow, Russia, using equipment of the Center for Shared Use of Scientific Equipment, CPFRC.

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  1. Shubnikov Institute of Crystallography, Crystallography and Photonics Federal Research Center, Russian Academy of Sciences, 119333, Moscow, Russia

    I. I. Buchinskaya

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  1. I. I. Buchinskaya
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Correspondence to I. I. Buchinskaya.

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Translated by V. Glyanchenko

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Buchinskaya, I.I. Behavior of Metal Difluorides MF2 (M = Ca, Sr, Ba, Cd, Pb) in Sodium Nitrate Melt. Russ. J. Inorg. Chem. 67, 1248–1252 (2022). https://doi.org/10.1134/S0036023622080046

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