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Thermal Dissociation of Molten Complex Compounds Me3XF7 (Me = Li, Na, K, X = Ti, Zr, Hf)

V. Daněk and R. Cekovskyý

Institute of Inorganic Chemistry, Slovak Academy of Sciences, CS-842 36 Bratislava

 

Abstract: The degree of the thermal dissociation on melting of complex compounds Me3XF7, where Me = Li, Na, K and X = Ti, Zr, Hf, has been calculated on the basis of the known phase diagrams of the systems MeF-Me3XF7. It was found that the thermal stability of the investigated complex compounds increases with the increasing size of the central transition metal as well as with decreasing polarizability of the present alkali metal cation. The substitution of the fluorine atom in the coordination sphere of the transition metal by chlorine one leads to the decrease of the thermal stability of the compound.Besides, the enthalpies of fusion ot the investigated complex compounds were calculated on the basis of the cryoscopic measurements in independent systems.

Full paper in Portable Document Format: 463a161.pdf

 

Chemical Papers 46 (3) 161–166 (1992)

Monday, June 27, 2022

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