Results 111 to 120 of about 260 (165)

Phase transitions in elpasolites (ordered perovskites)

Materials Science and Engineering: R: Reports, 1998
Abstract Many compounds with general chemical formula A 2 BB′X 6 and with tolerance factor value ...
I.N. Flerov, M.V. Gorev, K.S. Aleksandrov, A. Tressaud, J. Grannec, M. Couzi   +5 more
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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 H Bartram
exaly   +2 more sources

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
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Applications of Elpasolites as a Multimode Radiation Sensor

, 2017
This study consists of both computational and experimental investigations. The computational results enabled detector design selections and confirmed experimental results. The experimental results determined that the CLYC scintillation detector can be applied as a functional and field-deployable multimode radiation sensor.
Guckes, Amber Lynn
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Role of metal fluoride octahedra in the mechanism of phase transitions in A2BMF6 elpasolites

Journal of Fluorine Chemistry, 2002
Sequences of phase transitions (PTs) occurring in (AI)2BIMIIIF6 elpasolites have been studied via X-ray diffraction, differential scanning calorimetry (DSC) and adiabatic calorimetry at low temperature (LT).
J Grannec, A Tressaud
exaly   +2 more sources

The Madelung Function of Elpasolites

Zeitschrift für Naturforschung B, 2000
Abstract Madelung Energy, Coulomb Interaction, Elpasolite For binary ionic compounds the Madelung energy can be calculated using the Madelung constant, the ionic charges and the next neighbour distance of the ions only. For ternary and higher systems the well-known standard formula cannot be applied, because the ionic charges and ...
Veit Marx, Bernd Hundhammer
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Specific heat of the elpasolite Pb2MgWO6

Physics of the Solid State, 1999
The specific heat of Pb2MgWO6 has been measured in the temperature interval 83–370 K. An anomaly in the specific heat associated with the phase transition at T 0=312.8K has been discovered. The thermodynamic parameters of the structural phase transition Fm3m-Pmcn have been determined.
I. N. Flërov, M. V. Gorev, Ph. Sciau
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Elpasolite from hyperalkaline pegmatite of the Khibiny pluton, Kola Peninsula. Symmetry of elpasolite

Geology of Ore Deposits, 2008
Elpasolite, K2NaAlF6, has been found for the first time in a pegmatite related to peralkaline foid syenite at Mt. Koashva, Khibiny alkaline pluton, Kola Peninsula, Russia, as pale pink octahedral crystals up to 2 mm in size within cavities in the natrolite core of pegmatite in association with amicite, sodalite, aegirine, pectolite, catapleiite ...
I. V. Pekov, N. V. Chukanov, N. N. Kononkova, N. V. Zubkova, M. Kh. Rabadanov, D. Yu. Pushcharovsky   +5 more
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Prediction of new halo-elpasolites

Russian Journal of Inorganic Chemistry, 2016
We predicted elpasolites having the composition A2BCHal6 (A and C stand for different monovalent metals; B stands for trivalent metals; and Hal for F, Cl, or Br) that have not been obtained yet. Prediction was based on the data on properties of elements and simple halides only.
N. N. Kiselyova, A. V. Stolyarenko, V. V. Ryazanov, O. V. Sen’ko, A. A. Dokukin   +4 more
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Development of an elpasolite planetary science instrument

2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD), 2016
Planetary gamma-ray and neutron spectroscopy from orbiting spacecraft has become a standard technique to measure distinctive composition and abundance signatures for key elements relevant to planetary structure and evolution. Previous instrumentation that has led to the discovery of the concentration of many elements including hydrogen (a strong ...
Suzanne F. Nowicki, Laura C. Stonehill, Daniel D. S. Coupland, Katherine E. Mesick   +3 more
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