Thermodynamic Approach of Lanthanide-Iron Double Oxides Formation
Standard Gibbs energy of formation ΔGfor(298.15) of
lanthanide-iron double oxides of garnet-type crystal structure
R3Fe5O12 - RIG (R – are rare earth ions) from initial oxides are
evaluated. The calculation is based on the data of standard entropies
S298.15 and standard enthalpies ΔH298.15 of formation of compounds
which are involved in the process of garnets synthesis. Gibbs energy
of formation is presented as temperature function ΔGfor(T) for the
range 300-1600K. The necessary starting thermodynamic data were
obtained from calorimetric study of heat capacity – temperature
functions and by using the semi-empirical method for calculation of
ΔH298.15 of formation. Thermodynamic functions for standard
temperature – enthalpy, entropy and Gibbs energy - are
recommended as reference data for technological evaluations.
Through the structural series of rare earth-iron garnets the correlation
between thermodynamic properties and characteristics of lanthanide
ions are elucidated.
[1] S. C. Parada, S. K. Rakshit, Ziley Singh, J. Solid State Chemistry,
vol.181, pp 101-121, 2088
[2] Henderson A., Oor Y. D., Meyer H., Remeika J, J. Phys. Rev. vol.185
pp.1218-1229, 1969
[3] Harris A. B., Meyer H., J. Phys. Rev., vol 127, pp 101-118, 1962
[4] Gorbunov V. E., Gurevich V. M., Gavrichev K. C., Russ. J Phys.
Chemistry, vol 56, pp. 235-237, 1982
[5] S. Krupicka, “Physik der Ferrite und der Verwandten Magnetischen
Oxides”, Academia, Prague, 1973
[6] Mirianashvili,T. B., Varazashvili V. S., Gavrichev K. S., Tsarakhov M.
S., Tsagareishvili D.S, J. Phys. Chem. Vol. 67, pp1721-1723, 1993
[7] V. S. Varazashvili, M. S. Tsarakhov, T. B. Mirianashvili, T. A.
Pavlenishvili, J. Inorganic Chemistry (Russian), vol. 42, pp.926-928,
1997
[8] Guillot, F. Tcheou, A. Marchand, P. Feldmann, R. Lagnier, J.
Condensed Matter, vol.44 pp.53-57, 1981
[9] Lahoubi, W. Younsi, M. L. Soltani, J. Voiron, and D. Schmitt, J. of
Physics: Conference Series. 150, (2009)042108
[10] Thermal properties of compounds (Russian, editor P. Glushko).
“Nauka”, Moscow, 1978-1982
[11] G. Gvelesiani, D. S. Tsagareishvili, A. A. Nadiradze, Thermodynamics
of oxide compounds of rare-earth metals at high temperatures,
“Mecniereba”, Tbilisi, 1983
[12] Van W. Schroter, K. H. Lautenschlager, H. Bibrack und A. Schmabel,
Chemie, Veb Fachbuchverlag, Leipzig, (Translated Russian) 1989.
[1] S. C. Parada, S. K. Rakshit, Ziley Singh, J. Solid State Chemistry,
vol.181, pp 101-121, 2088
[2] Henderson A., Oor Y. D., Meyer H., Remeika J, J. Phys. Rev. vol.185
pp.1218-1229, 1969
[3] Harris A. B., Meyer H., J. Phys. Rev., vol 127, pp 101-118, 1962
[4] Gorbunov V. E., Gurevich V. M., Gavrichev K. C., Russ. J Phys.
Chemistry, vol 56, pp. 235-237, 1982
[5] S. Krupicka, “Physik der Ferrite und der Verwandten Magnetischen
Oxides”, Academia, Prague, 1973
[6] Mirianashvili,T. B., Varazashvili V. S., Gavrichev K. S., Tsarakhov M.
S., Tsagareishvili D.S, J. Phys. Chem. Vol. 67, pp1721-1723, 1993
[7] V. S. Varazashvili, M. S. Tsarakhov, T. B. Mirianashvili, T. A.
Pavlenishvili, J. Inorganic Chemistry (Russian), vol. 42, pp.926-928,
1997
[8] Guillot, F. Tcheou, A. Marchand, P. Feldmann, R. Lagnier, J.
Condensed Matter, vol.44 pp.53-57, 1981
[9] Lahoubi, W. Younsi, M. L. Soltani, J. Voiron, and D. Schmitt, J. of
Physics: Conference Series. 150, (2009)042108
[10] Thermal properties of compounds (Russian, editor P. Glushko).
“Nauka”, Moscow, 1978-1982
[11] G. Gvelesiani, D. S. Tsagareishvili, A. A. Nadiradze, Thermodynamics
of oxide compounds of rare-earth metals at high temperatures,
“Mecniereba”, Tbilisi, 1983
[12] Van W. Schroter, K. H. Lautenschlager, H. Bibrack und A. Schmabel,
Chemie, Veb Fachbuchverlag, Leipzig, (Translated Russian) 1989.
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:70739", author = "Vera Varazashvili and Murman Tsarakhov and Tamar Mirianashvili and Teimuraz Pavlenishvili and Tengiz Machaladze and Mzia Khundadze", title = "Thermodynamic Approach of Lanthanide-Iron Double Oxides Formation", abstract = "Standard Gibbs energy of formation ΔGfor(298.15) of
lanthanide-iron double oxides of garnet-type crystal structure
R3Fe5O12 - RIG (R – are rare earth ions) from initial oxides are
evaluated. The calculation is based on the data of standard entropies
S298.15 and standard enthalpies ΔH298.15 of formation of compounds
which are involved in the process of garnets synthesis. Gibbs energy
of formation is presented as temperature function ΔGfor(T) for the
range 300-1600K. The necessary starting thermodynamic data were
obtained from calorimetric study of heat capacity – temperature
functions and by using the semi-empirical method for calculation of
ΔH298.15 of formation. Thermodynamic functions for standard
temperature – enthalpy, entropy and Gibbs energy - are
recommended as reference data for technological evaluations.
Through the structural series of rare earth-iron garnets the correlation
between thermodynamic properties and characteristics of lanthanide
ions are elucidated.", keywords = "Calorimetry, entropy, enthalpy, heat capacity, gibbs
energy of formation, rare earth iron garnets.", volume = "9", number = "9", pages = "1109-4", }