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2009 | 7 | 4 | 774-779
Tytuł artykułu

Calorimetric study of melts in the system KF - K2TaF7

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Enthalpy increment measurements on melts in the system KF-K2TaF7 were carried out by drop calorimetry at temperatures between 298 K and 1063, 1103 and 1143 K for selected compositions. Heat capacities of the melted mixtures and enthalpies of mixing have been determined. Careful calorimetric experiments showed small but distinct non-ideality of the melt. The molar heat capacity of melt exhibits small positive divergence from additivity. The molar enthalpy of mixing shows negative deviation from ideality which decreases with increasing temperature. The thermal effect at mixing was assigned predominantly to association reactions producing more complex fluorotantalate anions. The formation of complex anions with lower coordination number of Ta may not be excluded. [...]
Wydawca

Czasopismo
Rocznik
Tom
7
Numer
4
Strony
774-779
Opis fizyczny
Daty
wydano
2009-12-01
online
2009-10-06
Twórcy
autor
  • Institute of Inorganic Chemistry, Slovak Academy of Sciences, Sk-845 36, Bratislava, Slovak Republic, ivan.nerad@savba.sk
  • Institute of Inorganic Chemistry, Slovak Academy of Sciences, Sk-845 36, Bratislava, Slovak Republic
  • Institute of Inorganic Chemistry, Slovak Academy of Sciences, Sk-845 36, Bratislava, Slovak Republic
Bibliografia
  • [1] A. Agulyansky, The Chemistry of Tantalum and Niobium Fluoride Compounds (Elsevier, Amsterdam, 2004)
  • [2] Zui Bin-Sin, N.P. Luzhnaya, V.I. Konstantinov, Zh. Neorg. Khim. 8, 389 (1963) (in Russian)
  • [3] I.D. Efros, M.F. Lantratov, Zh. Prikl. Khim. (Leningrad) 37, 2521 (1964) (in Russian)
  • [4] F.V. Kovalev, V.E. Karcev, V.M. Ioffe, M.E. Leonov, Zh. Neorg. Khim. 18, 1352 (1973) (in Russian)
  • [5] A.I. Agulyansky, V.A. Bessonova, Zh. Prikl. Khim. 51, 489 (1983) (in Russian)
  • [6] A.I. Agulyansky, J. Fluorine Chem. 123, 155 (2003) http://dx.doi.org/10.1016/S0022-1139(03)00190-8[Crossref]
  • [7] L. Kosa, I. Macková, I. Proks, O. Pritula, Ľ. Smrčok, M. Boča, H. Rundlöf, Cent. Eur. J. Chem. 6, 27 (2008) http://dx.doi.org/10.2478/s11532-007-0056-2[Crossref]
  • [8] B. Kubíková, M. Boča, M. Gaune-Escard, Monatsh. Chem. 139, 587 (2008) http://dx.doi.org/10.1007/s00706-007-0825-9[Crossref]
  • [9] M. Boča, V. Danielik, Z. Ivanová, E. Mikšíková, M. Kubíková, J. Thermal. Anal. 90, 159 (2007) http://dx.doi.org/10.1007/s10973-006-7700-5[Crossref]
  • [10] Z. Mazej, R. Hagiwara, J. Fluorine Chem. 128, 423 (2007) http://dx.doi.org/10.1016/j.jfluchem.2006.10.007[Crossref]
  • [11] I. Proks, M. Eliášová, I. Zlatovský, J. Záuška, Silikáty 21, 253 (1977) (in Slovak, summary in English)
  • [12] I. Nerád, E. Mikšíková, Cent. Eur. J. Chem. 6, 297 (2008) http://dx.doi.org/10.2478/s11532-008-0025-4[Crossref]
  • [13] O. Knacke, O. Kubashewski, K. Hesselmann, Thermochemical Properties of Inorganic Substances I, 2nd edition (Springer-Verlag, Berlin, 1991)
  • [14] I. Nerád, E. Mikšíková, V. Danek, Chem. Papers 57, 73 (2003)
  • [15] A.I. Agulyansky, P.T Stangrit, V.I. Konstantinov, Zh. Prikl. Khim. 51, 789 (1978) (in Russian)
  • [16] A.I. Agulyansky, P.T. Stangrit, V.I. Konstantinov, Zh. Prikl. Khim. 51, 2720 (1978) (in Russian)
  • [17] J.S. Fordyce, R.Z. Baum, J. Chem. Soc. (London) 44, 1151 (1966)
  • [18] J.S. Fordyce, R.Z. Baum, J. Chem. Phys. 44, 1166 (1966) http://dx.doi.org/10.1063/1.1726802[Crossref]
  • [19] A.I. Agulyansky, Ya.A. Sakharov, Zh. Prikl. Spektr. 31, 288 (1979) (in Russian)
  • [20] A.I. Agulyansky, S.A. Kirillov, V.D. Prisyagny, Ukrain. Khim. Zh. 46, 457 (1980) (in Russian)
  • [21] O.K. Hartman, F.A. Miller, Spectrochim. Acta 24A, 669 (1968)
  • [22] M. Boča, Z. Ivanová, M. Kucharík, J. Cibulková, R. Vasiljev, M. Chrenková, Z. Phys. Chem. 220, 1159 (2006)
  • [23] J. Cibulková, M. Chrenková, R. Vasiljev, V. Kremenetsky, M. Boča, J. Chem. Eng. Data 51, 984 (2006) http://dx.doi.org/10.1021/je050490g[Crossref]
  • [24] L. Kosa, I. Proks, Chem. Papers 62, 616 (2008) http://dx.doi.org/10.2478/s11696-008-0064-5[Crossref]
  • [25] A.I. Agulyansky, Zh. Neorg. Khim. 25, 2998 (1980) (in Russian)
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-009-0082-3
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