Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Z. Potůček"'
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
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
Autor:
Olga Kusmartseva, Z. Bryknar, N. N. Kovaleva, Alexandr Dejneka, E. I. Demikhov, Feodor Kusmartsev, Z. Potůček, K. I. Kugel, N. S. Goryachev, V. A. Trepakov, A. M. Stoneham
Publikováno v:
Journal of Experimental and Theoretical Physics. 122:890-901
In magnetic compounds with Jahn–Teller (JT) ions (such as Mn3+ or Cu2+), the ordering of the electron or hole orbitals is associated with cooperative lattice distortions. There the role of JT effect, although widely recognized, is still elusive in
Publikováno v:
Оптика и спектроскопия. 121:586-589
Autor:
V. A. Trepakov, Z. Potůček, Alexandr Dejneka, A. P. Skvortsov, Lubomir Jastrabik, Z. Bryknar, N. K. Poletaev
Publikováno v:
Journal of Luminescence. 154:437-444
Results of a detailed study of optical absorption and photoluminescence of slightly erbium-doped (~50 ppm) strontium titanate (SrTiO 3 ) single crystals are presented. This study allowed us to specify the structure of energy levels that determine the
Autor:
Anna Lynnyk, O. Stupakov, Aleš Jäger, V. Valvoda, V. A. Trepakov, Marina Makarova, M. Čerňanský, Jan Drahokoupil, E.A. Tereshina, Lubomir Jastrabik, Z. Potůček, Alexandr Dejneka, F. Borodavka
Publikováno v:
Materials Chemistry and Physics. 143:570-577
Cubic perovskite SrTi1−xMnxO3 nanopowders with x = 0–0.5, which is much higher than the conventionally believed Mn incorporation limit, and particles sizes 10–80 nm have been successfully synthesized using the citrate sol–gel method. The crys
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Autor:
Alexandr Dejneka, V. A. Trepakov, Lubomir Jastrabik, Marina Makarova, A. G. Badalyan, Petr Sazama, Z. Potůček
Publikováno v:
Materials Science and Technology. 25:1334-1340
Optical absorption and photoluminescence of Cr3+ impurity ion probe were studied on nanocrystalline SrTiO3/Cr(0·1%) powders with an average particle size between 13 and 100 nm prepared by the Pechini type polymeric sol–gel method. Only Oh1 cubic p
Autor:
Alexandr Dejneka, Z. Potůček, A. Churpita, Gerald Gerlach, Lubomir Jastrabik, Zdeněk Hubička, Gunnar Suchaneck, V. A. Trepakov
Publikováno v:
Journal of Nanoscience and Nanotechnology. 9:4094-4097
Technology aspects, structure and characteristic properties of the atmospheric barrier torch discharge technique grown nominally pure and Al (0.1-5%) and Mn (0.05-0.5%) doped ZnO nanocrystalline thin films deposited on fused quartz substrates are rep
Publikováno v:
Ferroelectrics. 335:95-102
Photoluminescence (PL) spectra of Cr doped BaxSr 1 − x TiO 3 (x = 0–0.84) (BST) thin films were investigated for the first time. XRD patterns revealed typical peaks of BST microcrystalline perovskite phase. Chromium doping of BST thin films was a