Luminescent-technique study on the structure of cation subsystem in the ionic conductor Na5RESi4O12 (RE is a rare-earth cation Tb3+, Ho3+, Er3+, Gd3+, Eu3+)
Tóm tắt
Results of experimental studies of luminescence in a group of materials with common formula Na5RESi4O12 (RE is a rare-earth cation Tb3+, Ho3+, Er3+, Gd3+, Eu3+ entering the stoichiometric formula of the substance) are summarized. The luminescence spectra give information on the mobile-cation sublattice structure and dynamics. It follows from experimental results that the current opinion on the disordering of mobile sublattice is not quite correct. At relatively low temperatures (T < 100 K), a small number of typical local configurations of cations can be elucidated, which in aggregate can describe the Na+ cation sublattice to rather high degree of accuracy. At higher temperatures, the number of spectral lines and their positions change, which formally corresponds to changes in the symmetry of sites of the lattice, hence, is the sign of a second order phase transition. This phenomenon is given an explanation based on a suggestion on the local dynamic averaging of the mobile cation electrical fields.
Từ khóa
Tài liệu tham khảo
Cardona, M., Phys. Rev., 1963, vol. 129, p. 69.
Gurevich, Yu.Ya. and Kharkats, Yu.I., Superionye provodniki, (Superionic Conductors), Moscow: Nauka, 1992.
Beyeler, H.V., Bruesch, P., Pietronero, L., Schneider, W.R., Strassler, S., and Zeller, H.R., Physics of Superionic Conductors, Salamon, M.B., Ed., Berlin: Springer, 1979.
Akopyan, I. Kh., Elektrokhimiya, 1990, vol. 26, p. 1495.
Studenyak, I.P., Kovach, D.Sh., Zinnikov, B.I., and Borts, A.N., Fiz. Tverd. Tela, 1987, vol. 29, p. 3442.
Kompan, M.E. and Venus, G.B., Zh. Eksp. Teor. Fiz., 1990, vol. 98, no. 1(7), p. 290.
Boyce, J.B. and Huberman, B.A., Phys. Rev., 1978, vol. 51, p. 189.
Owens, R.B. and Argue, G.R., Science, 1967, vol. 157, p. 308.
Collongues, R., Gourier, D., Kahn, A., Boilot, J.P., Colomban, Ph., and Wicker, A., J. Phys. Chem. Solids, 1984, vol. 45, p. 981.
Phyllips, J.C. and Andreoni, W., Phys. Rev. A, 1981, vol. 23, p. 6456.
Vashishta, P. and Rahman, A., Phys. Rev. Lett., 1978, vol. 40, p. 1338.
Mohua Mokur and Sujata Gohck, J. Phys. France, 1989, vol. 59, p. 431.
Shukla, A.K. and Funke, K., Europhys. Lett., 1989, vol. 10, p. 471.
Isaakyan, A.R. and Sokolov, A.V., Elektrokhimiya, 1988, vol. 24, p. 152.
Linford, R.G. and Hackwood, S., Chem. Rev., 1981, vol. 31, p. 327.
Personov, R.I., Al’shits, E.A., and Bykovskaya, L.A., Pis’ma Zh. Eksp. i Teor. Fiz., 1972, vol. 15, p. 609.
Pobedimskaya, E.A., Pushcharovskii, D.Yu., and Karpov, O.G., in Strukturnye tipy redkozemel’nykh silikatov, germanatov i fosfatov (Structure Types of Rare-Earth Silicates, Germanates and Phosphates), Moscow: Mosk. Gos. Univ., 1984.
Merinov, B.V., Maksimov, B.A., Kharitonov, Yu.A., and Belov, N.V., Dokl. Akad. Nauk SSSR, 1978, vol. 240, p. 81.
Atovmyan, L.O., Filipenko, O.S., Ponomarev, V.I., Leonova, L.S., and Ukshe, E.A., Solid State Ionics, 1984, vol. 14, p. 137.
Ponomarev, V.I., Filipenko, O.S., Chekhlov, A.N., and Atovmyan, L.O., Khim. Fiz., 1983, vol. 21, p. 1603.
Yen, W.Z. and Seltzer, P.C., Laser Spectroscopy of Solids, New York: Springer, 1981.
Ponomarev, V.I., Pis’ma Zh. Tekh. Fiz., 1984, vol. 10, p. 345.
Kompan, M.E., Venus, G.B., Dimitrova, O.V., Litvin, B.N., and Popova, T.B., Fiz. Tverd. Tela, 1986, vol. 28, p. 1944.
Kompan, M.E. and Venus, G.B., Fiz. Tverd. Tela, 1990, vol. 32, p. 3214.
Kompan, M.E., Venus, G.B., and Mikhel’son, V.T., Fiz. Tverd. Tela, 1990, vol. 32, p. 889.
Geizel, T., in Physics of Superionic Conductors, Salamon, M.B., Ed., Berlin: Springer, 1979.
Kompan, M.E., Venus, G.B., and Dimitrova, O.V., Pis’ma Zh. Eksp. Teor. Fiz., 1990, vol. 52, p. 1185.
Kompan, M.E. and Venus, G.B., Elektrokhimiya, 1990, vol. 26, p. 1484.
Kompan, M.E. and Venus, G.B., Zh. Eksp. Teor. Fiz., 1992, vol. 101, no. 4, p. 1424.
Gaiduk, M.I., Zolin, V.F., and Gaigerova, L.S., Spektry lyuminestsentsii ionov evropiya (Luminescence Spectra of Europium Ions), Moscow: Nauka, 1974.
Kompan, M.E., Venus, G.B., and Dimitrova, O.V., Pis’ma Zh. Eksp. Teor. Fiz., 1992, vol. 55, no. 1, p. 48.
Kompan, M.E. and Venus, G.B., Zh. Eksp. Teor. Fiz., 1993, vol. 104, no. 5, p. 3693.
Landau, L.D. and Lifshitz, E.M., Statisticheskaya fizika (Statistical Physics), Moscow: Nauka, 1964.
Kompan, M.E. and Venus, G.B., Fiz. Tverd. Tela, 1997, vol. 39, no. 11, p. 1997.
Dieke, R., Spectra and Energy Levels of Rare Earth Ions in Crystals, New York: Interscience, 1968.
Reisfield, R. and Jorgensen, C.K., Lasers and Exited States of Rare Erths, Berlyn: Springer, 1977.