Zobrazeno 1 - 10
of 195
pro vyhledávání: '"V. A. Trepakov"'
Optical spectroscopy and unusual temperature shift of f – f zero-phonon luminescence lines: KTaO3:Er
Autor:
V. A. Trepakov, A. P. Skvortsov, Z. Potucek, Z. Bryknar, D. Nuzhnyy, V. Laguta, V. G. Kuznetsov, A. A. Gavrikov, A. Dejneka
Publikováno v:
Ferroelectrics. 591:191-200
Autor:
D. Nuzhnyy, V. Bovtun, E. Buixaderas, J. Petzelt, M. Savinov, M. Kempa, M. Paściak, I. Rafalovskyi, V. Chelod Paingad, P. Kužel, S. Kamba, D. Repček, A. Pashkin, V. A. Trepakov, Z. Trybuła
Publikováno v:
Physical Review B. 105
Publikováno v:
Physics of the Solid State. 63:248-252
The electric field effect in electron spin resonance spectra of Fe3+ and Mn4+ impurity ions in thin oriented single-crystal plates of strontium titanate has been studied; the crystal structure of these samples at T > 105 K is tetragonal (i.e., differ
Publikováno v:
Physics of the Solid State. 62:912-918
In KTaO3:Er crystals, we observed a temperature shift, unusual for rare earth impurities, for narrow zero-phonon luminescence lines, due to the 4S3/2 → 4I13/2, 4F9/2 → 4I15/2, and 4S3/2 → 4I15/2 transitions in Er3+ impurity ions. The magnitude
Publikováno v:
Ferroelectrics. 538:35-44
The temperature dependence of the principal values of the refraction of light (specific optical retardation) in Sr1-xCaxTiO3 with x = 0.014, SrTi(16O0.0318O0.97)3 and KTa1–xNbxO3 with x = 0.018 single crystals have been measured and the magnitudes
Autor:
V. A. Trepakov, P. A. Markovin, A. G. Razdobarin, Alexandr Dejneka, O. E. Kvyatkovskii, M. E. Guzhva
Publikováno v:
Physics of the Solid State. 60:1793-1806
We have examined temperature changes of the light refraction, birefringence, dielectric permittivity, and dielectric hysteresis loops in Sr1 – xCaxTiO3 single crystals with x = 0.014 (SCT-1.4). The dielectric properties of Sr1 – xCaxTiO3 with x =
Publikováno v:
Bulletin of the Russian Academy of Sciences: Physics. 82:273-279
The magnitudes and temperature dependences of the root-mean-square of polarization fluctuations, which characterizes short-range ordering below TC, are determined for the first time for Sr0.986Ca0.014TiO3 single crystals, using temperature measuremen
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 311:1333-1338
Instrumental neutron activation analysis was used for determination of vanadium mass fraction in crystals of incipient ferroelectric strontium titanate and ferroelectric barium titanate. In order to improve vanadium limit of detection, discriminating
Autor:
V. A. Trepakov, S. I. Nikitin, I. N. Gracheva, D. G. Zverev, B. F. Gabbasov, Alexander Rodionov, Alexandr Dejneka, Airat Kiiamov, R. V. Yusupov, Lubomir Jastrabik
Publikováno v:
Europhysics Letters. 133:37002
Electron paramagnetic resonance studies of the impurity Fe$^{3+}$ and Mn$^{4+}$ centers indicate that the symmetry of the crystal structure of millimeter-scale strontium titanate plates above 105 K lowers in the bulk from cubic to tetragonal, differe
Autor:
Z. Potůček, A. P. Skvortsov, Z. Bryknar, Lubomir Jastrabik, Alexandr Dejneka, N. K. Poletaev, P. P. Syrnikov, V. A. Trepakov
Publikováno v:
Optics and Spectroscopy. 121:534-537
The f–f absorption and emission spectra of Er3+ impurities were observed and identified in KTaO3 and K1 – xLixTaO3 single crystals. It was shown that Li off-centers related random fields markedly influence intensity, width and position of zero-ph