Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 6

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Raman Spectra of Bismuth Oxyhalide Single Crystals

100%
Bunda S., Bunda V.
|
|
vol. 126
|
issue 1
272-273
EN
Oxyhalogenides of bismuth BiOX (X=Cl, Br and I) are very interesting materials which find various applications as X-ray luminescent screens, anti-Stokes (frequency upshift) converters, luminophors, and photoconducting analyzers of linear polarized radiation. Since each primitive cell consist of six monoatomic sites, the structure of the reduced representation of the 15 normal modes of vibration is: Γ= 2A_{1g}(Ra.)+B_{1g}(Ra.)+ 3E_{g}(Ra.)+ 2A_{2u}(i.r.)+ 2E_{u}(i.r.), in which the vibrations of A_{1g}, B_{1g} and E_{g} species are active in the Raman spectrum and those of A_{2u} and E_{u} species are active in the infrared (i.r.) spectrum. The Raman active modes are observed in frequency range 55 - 225 cm^{-1}, 50 - 185 cm^{-1 }, and 45 - 175 cm^{-1} for the BiOCl, BiOBr and BiOI single crystals respectively.
2
Content available remote

Anizotropy of Photoconductivity in BiOCl (X=Cl, Br, I) Single Crystals

81%
Komanicky V., Bunda S., Botko M., Bunda V.
|
|
vol. 126
|
issue 1
274-275
EN
Oxyhalides of bismuth BiOX (X = Cl, Br, I) are very interesting materials which find various applications as X-ray luminescent screens, as anti-Stokes converters, photocatalyst, usual luminophors and as photoconductive analyzer of linear polarized radiation in the 0.24 - 1.2 μm spectral region. The great interest for these materials is strongly related to the influence of dimensionality on the behaviour of physical properties (they are 2D structured materials). Bismuth oxyhalides are one of the V-VI-VII group compound semiconductors belonging to the tetragonal system. The structure of BiOX is known to have a layered structure, which is constructed by the combination of the halide ion layer and the bismuth oxygen layer. We present results of the study of photoconductivity spectra anisotropy of the BiOX single crystals.
3
Content available remote

Physical Properties of "HTSC/Photosemiconductor" Micro- and Nanoplates Based Junctions

71%
Bunda V., Bunda S., Vashchuk F., Feher A., Kováč J.
|
|
issue 5
1040-1041
EN
In this paper we report the formation process and electrophysical properties of 'high temperature superconductor (YBa_2Cu_3O_{7 - x})/photosemiconductor (BiOCl:Ti)' micro- and nanoplates based junction. The energy band model of ≪HTSC-semiconductor≫ junction is proposed.
4
Content available remote

Ferroelastic Phase Transition in a Layered Bismuth Oxychloride Single Crystals

61%
Bunda V., Bunda S., Vashchuk F., Feher A., Kajňaková M., Kováč J., Syrkin E.
|
|
issue 5
1069-1070
EN
We report the results of low-temperature specific-heat, magnetization, and X-ray diffraction measurements on a bismuth oxyhalide (BiOCl) single crystal. We conclude that BiOCl in temperature region 150-230 K shows "antiferroelastic-paraelectric" phase transitions at critical temperatures T_{c1} = 167.5 K and T_{c2} = 214.6 K, respectively.
5
Content available remote

Application of Superconductor/Photosemiconductor Contact Structures in Electronics

61%
Bunda V., Bunda S., Komanicky V., Botko M., Čižmár E., Feher A.
|
|
vol. 126
|
issue 1
362-363
EN
In recent years, two-dimensional (2D) nanostructured materials, such as nanoplates and nanosheets, have attracted much attention because of their unique electronic, magnetic, optical, and catalytic properties, which mainly arise from their large surface areas, nearly perfect crystallinity, structural anisotropy, and quantum confinement effects in the thickness. The 2D nanostructured materials can be used as building blocks for advanced materials and devices with designed functions in areas as diverse, as lasers, transistors, catalysis, solar cells, light emission diodes, chemical and biological sensors. We report physical properties of YBCO/BiOI contact structures and electrophysical properties of BiOI single crystal.
6
Content available remote

Low Temperature Specific Heat of BiOX (X = Cl, Br, and I) Single Crystals

61%
Bunda V., Bunda S., Kajňakova M., Feher A., Syrkin E., Feodosyev S.
|
|
issue 5
986-987
EN
Low temperature specific heat of layered bismuth oxyhalide crystals has been studied in the temperature range from 2 to 50 K in zero and 8 T magnetic field. The expected Debye-like behaviour at the lowest temperatures (below 4-5 K) is established. Linear dependences of entropy and the Debye temperature as cross-correlation parameters are established. The small values of the Debye temperature and peculiarities of phonon spectra at lowest temperatures are discussed.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.