State Scientific Research and Design Institute of Rare Metal Industry Giredmet JSC

Moscow, Russia

State Scientific Research and Design Institute of Rare Metal Industry Giredmet JSC

Moscow, Russia

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Romanov A.N.,Moscow State University | Veber A.A.,RAS A.M. Prokhorov General Physics Institute | Fattakhova Z.T.,RAS Semenov Institute of Chemical Physics | Vtyurina D.N.,RAS Semenov Institute of Chemical Physics | And 6 more authors.
Journal of Luminescence | Year: 2014

Bi+-doped single crystals of triple chloride CsCdCl3 were prepared by the Bridgman method. Bismuth monocation is responsible for characteristic two-peaked absorption feature in visible and long lived NIR luminescence in this crystal. The splitting of the Bi+ lowest electronic states by crystal field is considered. The absorption spectrum is assigned to optical transitions of A→E type in two nonequivalent Bi + positions of D3h and C3v symmetry. The possibility of Jahn-Teller effect in Bi+ excited states of E type is discussed in relation with absorption and luminescence excitation spectra properties. © 2014 Elsevier B.V.


Romanov A.N.,RAS Semenov Institute of Chemical Physics | Veber A.A.,Friedrich - Alexander - University, Erlangen - Nuremberg | Vtyurina D.N.,RAS Semenov Institute of Chemical Physics | Kouznetsov M.S.,State Scientific Research and Design Institute of Rare Metal Industry Giredmet JSC | And 7 more authors.
Journal of Luminescence | Year: 2015

Abstract Single crystals of ternary bromide phase CsCdBr3 doped with univalent bismuth cations are prepared for the first time by the Bridgman method. Bi+ impurity center emits a broadband long-lived near-infrared photoluminescence with a maximum at ∼1053 nm. The characteristics of this photoluminescence and its relations with the energy spectrum of Bi+ impurity center are discussed. A comparison of Bi+ photoluminescence in CsCdBr3 and ternary chlorides (studied previously) is performed. © 2015 Elsevier B.V.


Bulat L.P.,National Research University of Information Technologies | Pshenay-Severin D.A.,RAS Ioffe Physical - Technical Institute | Osvenskii V.B.,State Scientific Research and Design Institute of Rare Metal Industry Giredmet JSC
Physics of the Solid State | Year: 2016

The effect of electron and phonon scattering on nanometer-sized pores on the thermoelectric properties of lead telluride has been studied theoretically. Estimations show that the thermoelectric efficiency can increase by 20–25% at room temperature and by 5–10% at 600 K at the optimal pore size of several nanometers and the porosity of ~10%. An analysis shows that the increase in the thermoelectric efficiency due to additional scattering in the porous material is related to the decrease in the thermal conductivity of the lattice and the increase in the thermoelectric coefficient due to the change in the energy dependence of the relaxation time. To estimate the multiple scattering at high pore concentration, the lattice thermal conductivity by the molecular-dynamics method and the electron free paths in a coherent potential approximation were calculated. It is shown that the inclusion of the multiple scattering slightly influences the thermoelectric properties at noted sizes and pore concentrations. © 2016, Pleiades Publishing, Ltd.


Plotnichenko V.G.,Fiber Optics Research Center | Philippovskiy D.V.,Fiber Optics Research Center | Sokolov V.O.,Fiber Optics Research Center | Golovanov V.F.,State Scientific Research and Design Institute of Rare Metal Industry Giredmet JSC | And 3 more authors.
Optics Letters | Year: 2013

Experimental and computer-modeling studies of the spectral properties of crystalline AgCl doped with metal bismuth or bismuth chloride are performed. The broad near-IR luminescence band in the 0.8-1.2 μm range with time dependence described by two exponential components corresponding to the lifetimes of 1.5 and 10.3 μs is excited mainly by 0.39-0.44 μm radiation. Computer modeling of probable Bi-related centers in the AgCl lattice is performed. On the basis of experimental and calculation data, a conclusion is drawn that IR luminescence can be caused by Bi+ ion centers substituted for Ag+ ions. © 2013 Optical Society of America.

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