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Khvostikov V.A.,Russian Academy of Sciences | Karandashev V.K.,Russian Academy of Sciences | Burmii Z.P.,Russian Academy of Sciences | Buzanov O.A.,OAO Fomos Materials
Journal of Analytical Chemistry | Year: 2014

The possibilities of determining the impurities and basic components of lanthanum gallium silicate using laser ablation in combination with inductively coupled plasma mass spectrometry (LA-ICP-MS) were shown. A procedure for the determination of 54 impurity elements with the limits of determination from n × 10-5 wt % for Mg, Ti, V, Cr, Mn, Ni, Cu, and Zn to 2 × 10-7 wt % for U and also a procedure for the determination of a ratio between basic components were developed. It was found that the concentration ratios between gallium and lanthanum and silicon and lanthanum in the crystals of lanthanum gallium silicate remained constant upon consecutive melting operations with the addition of a charge mixture to the crucible. © 2014 Pleiades Publishing, Ltd.

Roschupkin D.V.,Russian Academy of Sciences | Emelin E.V.,Russian Academy of Sciences | Buzanov O.A.,OAO Fomos Materials
Russian Microelectronics | Year: 2014

The process of repolarization of LiTaO3 ferroelectric crystal by direct electron-beam lithography is studied. The possibility is considered of the formation of a domain structure with domain size ∼1 μm. It has been shown that in the 127° Y′-cross section of the LiTaO3 crystal ferroelectric domains form at an angle of 37° to the crystal surface and they grow from the negative surface to the positive along the polar Z-axis. © 2014, Pleiades Publishing, Ltd.

Kurosawa S.,Tohoku University | Kitahara M.,Tohoku University | Yokota Y.,Tohoku University | Hishinuma K.,Tohoku University | And 5 more authors.
IEEE Transactions on Nuclear Science | Year: 2014

In order to search for a new scintillation material consisting of tantalum (Ta) with a high atomic number of 73, we have investigated scintillation properties of langasite type crystal containing Ta. Non-doped Ca 3TaGa3Si2O14 (CTGS), which is well known as a piezoelectric material, was grown by the Czochralski method. Radio-luminescence spectrum of this crystal peaked around 340 nm. Its light output was approximately 1,200 photons/MeV. This crystal is expected to be a scintillation host material. © 2014 IEEE.

Kugaenko O.M.,National University of Science and Technology "MISIS" | Uvarova S.S.,National University of Science and Technology "MISIS" | Krylov S.A.,National University of Science and Technology "MISIS" | Senatulin B.R.,National University of Science and Technology "MISIS" | And 4 more authors.
Bulletin of the Russian Academy of Sciences: Physics | Year: 2012

The thermophysical parameters (thermal diffusivity χ, heat conductivity λ, thermal expansion, and specific heat c p coefficients) of single crystals from the langasite family are investigated in the basic crystallographic directions of X, Y, and Z in temperature range of 300 to 1300 K. The temperature dependences of the parameters are determined. It is found that their anisotropy decreases with temperature. © 2012 Allerton Press, Inc.

Kugaenko O.M.,National University of Science and Technology "MISIS" | Uvarova S.S.,National University of Science and Technology "MISIS" | Petrakov V.S.,Economic Power Institute | Buzanov O.A.,OAO Fomos Materials | And 3 more authors.
Russian Metallurgy (Metally) | Year: 2013

The microstructure of piezoelectric lanthanum-gallium tantalite single crystals is shown to change substantially during cyclic mechanical actions at room temperature and during thermal shock: the dislocation density increases, twinning takes place, and a mesostructure forms. This effect is related to the appearance of piezoelectric fields, which significantly decrease the temperature of the onset of plastic deformation of these brittle single crystals, during mechanical actions. © 2013 Pleiades Publishing, Ltd.

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