Abstract
Areas of fusion and crystallization peaks of K3TaO2F4 and KTaF6 were measured using the DSC mode of a high-temperature calorimeter (SETARAM 1800 K). On the basis of these quantities, considering the temperature dependence of the calorimeter sensitivity, values of the fusion enthalpy of K3TaO2F4 at the fusion temperature of 1181 K of (43 ± 4) kJ mol−1 and of KTaF6 at the fusion temperature of 760 K of (8 ± 1) kJ mol−1 were determined.
This is a preview of subscription content, log in via an institution to check access.
References
Adamkovièová, K., Fellner, P., Kosa, L., Lazor, P., Nerád, I., & Proks, I. (1991). Determination of the enthalpy of fusion of Na3FSO4. Thermochimica Acta, 191, 57–61. DOI: 10.1016/0040-6031(91)87237-Q.
Adamkovičová, K., Kosa, L., Nerád, I., & Proks, I. (1996). Determination of the enthalpy of fusion of K3TiF6Cl. Thermochimica Acta, 287, 1–6. DOI 10.1016/0040-6031(96)02993-0.
Agulyansky, A. (2004). The chemistry of tantalum and niobium fluoride compounds (1st ed.) (p. 147). Amsterdam: Elsevier B.V. DOI: 10.1016/B978-044451604-6/50005-7.
Agulyansky, A. I., Kuznetzov, V. Ya., Agulyanskaya, L. A., & Kalinnikov, V. T. (1984). Hexaftorotantalaty shchelochnykh metallov. Koordinatsionnaya Khimiya, 10, 1512–1514.
Barin, I., & Knacke, O. (1973). Thermochemical properties of inorganic substances (pp. 365, 379, 381, 404, 519). Berlin, Heidelberg, New York: Springer Verlag. Düsseldorf: Verlag Stahleisen.
Boèa, M., Fuess, H., & Ivanová, Z. (2005). Systems of potassium oxofluorotantalates. Chemical Papers, 59, 304–309.
Bode, H., & von Döhren, H. (1958). Die Kristallstruktur des Kaliumhexafluoroniobats und des Kaliumhexafluorotantalats. Acta Crystallographica, 11, 80–82. DOI: 10.1107/S0365110X58000220.
Chaminade, J. P., Vlasse, M., Pouchard, M., & Hagenmuller, P. (1974). Sur quelques oxyfluorotantalates de potassium. Bulletin de la Société Chimique de France, 9-10, 1791–1794.
Fouad, M., Chaminade, J. P., Ravez, J., & Hagenmuller, P. (1987)a. Les transitions de phases des oxyfluorures A3TiOF5 et A3MO2F4 (A=K, Rb, Cs; M=Nb, Ta). Revue de Chimie Minérale, 24, 1–9.
Fouad, M., Ravez, J., Chaminade, J. P., & Hagenmuller, P. (1987)b. Etude de la transition de phases de nouveaux oxyfluorures ferroélastiques K3NbOF6 et K3TaOF6. Revue de Chimie Minérale, 24, 583–592.
Ghosh, J. K., & Ghosh, G. (1988). Unit cell dimensions of some oxofluorometallates of transition metals. Journal of Fluorine Chemistry, 38, 183–186. DOI: 10.1016/S0022-1139(00)83027-4.
Iuchi, T., & Ono, K. (1961). Studies on the production of tantalum by electrolysis of fused salt. I. Solubility of tantalum oxide (Ta2O5-KF-K2TaF7 and Ta2O5-KCl-K2TaF7). Science Reports of the Research Institutes, Tohoku University, Serie A-13, 456–465.
JANAF thermochemical tables (3rd ed.). Washington D.C.: U.S. National Bureau of Standards.
Konstantinov, V. I. (1977). Vzaimodeystvie v oksiftoridnykh rasplavakh, soderzhashchikh soedineniya tantala. Elektroliticheskoe poluchenie tantala, niobiya i ikh splavov (pp. 14–23). Moskva: Metalurgia.
Ts’ui, P. H., Luzhnaya, N. P., & Konstantinov, V. I. (1963)a. Issledovanie troynoy vzaimnoy sistemi iz ftoridov i khloridov kalia i tantala. Zhurnal Neorganicheskoy Khimii, 8, 389–395.
Ts’ui, P. H., Konstantinov, V. I., & Luzhnaya, N. P. (1963)b. Rastvorimost i vzaimodeystvie faz v sistemakh iz Ta2O5, ftoridov i khloridov kalia i tantala. Zhurnal Neorganicheskoy Khimii, 8, 396–402.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kosa, L., Macková, I. & Netriová, Z. Determination of the enthalpy of fusion of K3TaO2F4 and KTaF6 . Chem. Pap. 63, 493–496 (2009). https://doi.org/10.2478/s11696-009-0039-1
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.2478/s11696-009-0039-1