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261.
Crystallography Reports - X-ray and electrophysical investigations of ceramics with a charge composition 95 mol % CeF3 × 5 mol % SrF2 synthesized by hot pressing of CeF3 and SrF2... 相似文献
262.
The thermal conductivity of terbium gallium and terbium scandium aluminum garnet crystals has been studied by the method of steady-state longitudinal heat flow in the temperature range of 50?300 K. The effect of the impurity composition of terbium gallium garnet crystals and the formula composition of terbium scandium aluminum garnet crystals on their thermal conductivity is shown.
相似文献263.
The fluorine-ion conductivity of single crystals with a tysonite (LaF3) structure with heterovalent isomorphic substitutions of highly polarizable Cd2+ cations with a 18-electron shell for rare earth ions Ce3+ have been studied for the first time. Ce0.995Cd0.005F2.995 single crystals have been grown from melt by the Bridgman technique in a fluorinating atmosphere. The fluorine-ion conductivity of single crystal is measured by impedance spectroscopy in the temperature range from 153 to 1073 K, where it increases by a factor of 109, approaching the value σdc = 5 × 10–2 S/cm at 1073 K. At T0 = 450 ± 20 K, the dependence σdc(T) is split into two portions with the ion-transport activation enthalpy ΔHσ = 0.39 ± 0.01 eV (T < T0) and ΔHσ = 0.23 ± 0.02 eV (T > T0). It is found that at T = 293 K the conductivity σdc = 3 × 10–5 S/cm of Ce0.995Cd0.005F2.995 crystal is higher by a factor of 10 than the conductivity of the tysonite matrix CeF3 and close to the σdc value for Ce0.995Sr0.005F2.995 crystal. This finding indicates a significant effect of the substitutions of Cd2+ ions for Ce3+ on the σdc value and the advantage of Cd2+ ions over Ca2+ and Ba2+ from the viewpoint of increasing σdc. 相似文献
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Sh. Makhkamov M. Karimov Z. M. Khakimov N. Dj. Odilova Sh. A. Makhmudov A. O. Kurbanov 《辐射效应与固体损伤》2013,168(8):349-356
This work presents the results of research on peculiarities of radiation defect formation in single crystal n-Si, doped by deep level impurities (Cu, Ni, Ir, Rh, Pt and Au), at irradiation by γ-quanta of 60Co. A property of γ-irradiation to create only vacancies and self-interstitial atoms is used to understand the nature of deep levels with participation of these impurities and primary elemental radiation defects. The role of covalence radii and diffusion coefficients in efficiency of radiation defect formation is discussed. 相似文献
269.
Yu. V. Ivanov A. R. Karimov L. N. Pyatnitsky A. P. Seryakov V. A. Shcheglov 《Journal of Russian Laser Research》2005,26(5):363-372
Transmission of laser radiation in human blood plasma diluted with physiological solution is studied. Comparison with scattering
in pure physiological solution is made. General and individual optical characteristics of blood plasma from different patients
are established. 相似文献
270.