Results 131 to 140 of about 454 (154)

Two-photon spectroscopy of europium(III) elpasolites

Journal of Physics: Condensed Matter, 1999
We present polarized two-photon excitation (TPE) spectra, including Zeeman data, for europium(III) in the elpasolites Cs2NaEuCl6 and Cs2NaYF6:Eu3+. Approximately 80 and 60 levels of unambiguous symmetry have been assigned respectively in each compound up to 32 000 cm-1 with the aid of a one-electron crystal field Hamiltonian.
J R G Thorne, M Jones, C S McCaw, K M Murdoch, R G Denning, N M Khaidukov   +5 more
openaire   +1 more source

Raman scattering of chromium-doped halide elpasolite crystals

Journal of Physics and Chemistry of Solids, 1991
Abstract Polarized Raman spectra of a single crystal of the chromium-doped elpasolite K 2 NaScF 6 : Cr 3+ yield an unambiguous identification of the symmetries and frequencies of the four Raman-active modes: a 1 g at 525 cm −1 , e g at 403 cm −1 and t 2 g at 250 and 113 cm −1 .
U. Sliwczuk, R.H. Bartram, D.R. Gabbe, B.C. McCollum   +3 more
openaire   +2 more sources

Elpasolite-type superstructures in inverse perovskite nitrides

Progress in Solid State Chemistry
Progress in solid state chemistry 74, 100444 (2024).
Link, Lukas, Wang, Haichen, Hansen, Thomas C., Baran, Volodymyr, Niewa, Rainer   +4 more
openaire   +2 more sources

Luminescence properties of U3+ doped chloride elpasolite

Journal of Molecular Structure, 1994
Abstract Absorption and luminescence spectra of U3+ in Cs2NaYCl6 single crystals are reported. An efficient luminescence is observed in the visible (centered at about 12282 cm−1 and 12903 cm−1) and near infrared (at 6321 cm−1 and 6940 cm−1) regions.
P.J. Dereń, W. Stręk, J. Drożdżyński   +2 more
openaire   +1 more source

Optical properties of Tb3+-doped Rb2KInF6 elpasolite

Optical Materials, 1999
Abstract Crystals of Rb 2 KInF 6 :Tb 3+ with elpasolite structure have been prepared by the Bridgman method. Absorption, wide range luminescence, high resolution emission, excitation and luminescence decay measurements have been carried out at low and room temperature in order to study the environments of Tb 3+ ions and their optical properties. An
M.A Buñuel, L Lozano, J.P Chaminade, B Moine, B Jacquier   +4 more
openaire   +1 more source

Structural phase transition in elpasolite-like (NH4)2KWO3F3

Physics of the Solid State, 2006
A new chemical compound, (NH4)2KWO3F3, was synthesized. The Rietveld-refined crystal structure was found to be cubic at room temperature and to belong to the elpasolite family (space group \(Fm\bar 3m\)). The heat capacity and unit cell parameters were studied within a broad temperature range. A second-order phase transition was found to occur at 235.4
I. N. Flerov, M. V. Gorev, V. D. Fokina, A. F. Bovina, M. S. Molokeev, Yu. V. Boĭko, V. N. Voronov, A. G. Kocharova   +7 more
openaire   +1 more source

Low-temperature specific heat of the Rb2KScF6 elpasolite

Physics of the Solid State, 2003
The specific heat of single-crystal Rb2KScF6 is measured using ac calorimetry in the range 4–280 K. The results are discussed in the context of a group-theoretical analysis of possible distortions of the elpasolite structure and of experimental data obtained earlier with an adiabatic calorimeter in a narrower temperature region.
I. N. Flerov, R. Burriel, M. V. Gorev, P. Isla, V. N. Voronov   +4 more
openaire   +1 more source

Two-photon Zeeman spectroscopy of terbium (III) elpasolites

The Journal of Chemical Physics, 1997
Polarised two-photon excitation (TPE) spectroscopy is a powerful technique for probing the energy levels of f-block elements at high symmetry sites because most pure electronic transitions are allowed by the selection rules. TPE in a magnetic field provides additional information, through the resolution of Zeeman components, evaluation of g-values, and
A. J. Berry, R. G. Denning, I. D. Morrison   +2 more
openaire   +1 more source

Electronic structure engineering of elpasolites: Case of Cs2AgYCl6

Journal of Luminescence, 2013
Abstract Electronic structure engineering of elpasolite-based scintillators is explored for improving light yield and scintillation response. First-principles calculations of electronic structure, polarons, and Ce activator in Cs 2 AgYCl 6 show that the electronegativity of constituent elements of a quaternary elpasolite compound can be manipulated ...
Mao-Hua Du, Koushik Biswas
openaire   +1 more source

Computer modeling of lattice dynamics in halide elpasolites

Journal of Physics and Chemistry of Solids, 1991
Abstract Lattice dynamics calculations were performed on the crystals K 2 NaScF 6 , K 2 NaGaF 6 and Cs 2 NaYCl 6 with cubic elpasolite structure, by means of pair potentials developed for lattice statics calculations. The predicted dispersion curves account well for the pressure dependence of Raman spectra.
R.S. Sinkovits, R.H. Bartram
openaire   +1 more source