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    Wyświetlanie 1-4 z 4
    Tytuł:
    Impact of Different Conditions of Technological Process on Thermoelectric Properties of Fine-Grained PbTe
    Autorzy:
    Królicka, A.
    Materna, A.
    Piersa, M.
    Mirowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1185703.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.10.Fq
    73.20.Hb
    81.20.Wk
    81.20.Ev
    Opis:
    The aim of this work was to obtain PbTe material in the desired way in order to control the combined impact of lattice disorder, nanoscale precipitates and reduced grain sizes on the thermoelectric properties of this material. To achieve this, PbTe ingot doped with Ag was obtained by the Bridgman method, followed by ball-milling, cold pressing and sintering. In order to estimate crystallites diameters grain size measurements were carried out using the optical microscopy. Studies of electrical and thermoelectric properties of fine-grained material were performed. In order to analyze the morphology and the composition scanning electron microscopy and energy-dispersive X-ray spectroscopy were performed. Energy-dispersive X-ray spectroscopy analysis also revealed presence of Ag-Te precipitates.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1255-1258
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mn Impurity in Bulk GaAs Crystals
    Autorzy:
    Pawłowski, M.
    Piersa, M.
    Wołoś, A.
    Palczewska, M.
    Strzelecka, G.
    Hruban, A.
    Gosk, J.
    Kamińska, M.
    Twardowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044520.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    72.20.Ee
    75.50.Pp
    76.30.Fc
    Opis:
    Magnetic and electron transport properties of GaAs:Mn crystals grown by Czochralski method were studied. Electron spin resonance showed the presence of Mn acceptor A in two charge states: singly ionized A$\text{}^{-}$ in the form of Mn$\text{}^{2+}$(d$\text{}^{5}$), and neutral A$\text{}^{0}$ in the form of Mn$\text{}^{2+}$(d$\text{}^{5}$) plus a bound hole (h). It was possible to determine the relative concentration of both types of centers from intensity of the corresponding electron spin resonance lines. Magnetization measured as a function of magnetic field (up to 6 T) in the temperature range of 2-300 K revealed overall paramagnetic behavior of the samples. Effective spin was found to be about 1.5 value, which was consistent with the presence of two types of Mn configurations. In most of the studied samples the dominance of Mn$\text{}^{2+}$(d$\text{}^{5}$)+h configuration was established and it increased after annealing of native donors. The total value of Mn content was obtained from fitting of magnetization curves with the use of parameters obtained from electron spin resonance. In electron transport, two mechanisms of conductivity were observed: valence band transport dominated above 70 K, and hopping conductivity within Mn impurity band at lower temperatures. From the analysis of the hopping conductivity and using the obtained values of the total Mn content, the effective radius of Mn acceptor in GaAs was estimated as a = 11±3Å.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 825-830
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Chemical Composition of Liquid Phase and Growth Process on Physical Properties of $Bi_2Se_3,$ $Bi_2Te_3$ and $Bi_2Te_2Se$ Compounds
    Autorzy:
    Hruban, A.
    Materna, A.
    Dalecki, W.
    Strzelecka, G.
    Piersa, M.
    Jurkiewicz-Wegner, E.
    Diduszko, R.
    Romaniec, M.
    Orłowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492965.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    72.10.-d
    72.15.-v
    72.20.-I
    73.20.-r
    Opis:
    We studied synthesis and crystal growth of $Bi_2Te_3,$ $Bi_2Se_3$ and $Bi_2Te_2Se$ compounds by means of vertical Bridgman method. Crystals were grown from stoichiometric melts and under different molar ratio of Bi:Te, Bi:Se or Bi:Te:Se. The obtained crystals were characterized by X-ray diffraction analysis, energy dispersive X-ray spectroscopy, scanning electron microscopy, atomic force microscopy, and the Hall effect measurements. Some of the samples demonstrated insulating bulk behavior, by means of resistivity versus temperature measurements.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 950-953
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Mn-Related Defect Band in InP
    Autorzy:
    Macieja, B.
    Korona, K. P.
    Piersa, M.
    Witowski, A. M.
    Wasik, D.
    Wysmołek, A.
    Strzelecka, G.
    Hruban, A.
    Surma, B.
    Palczewska, M.
    Kamińska, M.
    Twardowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036033.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    72.20.Ee
    72.20.Jv
    Opis:
    Electron paramagnetic resonance, optical absorption, luminescence and electrical studies of InP highly doped with Mn were performed. Electron paramagnetic resonance revealed presence of manganese in Mn$\text{}^{2+}$(d$\text{}^{5}$) configuration. In optical absorption, systematic reduction of InP band gap was observed with increase in Mn content. This was correlated with increase in photoionization-type absorption band starting at 0.2 eV. Time-resolved photoluminescence measurements showed decrease in photoexcited carrier lifetime and shortening of donor-acceptor pair recombination time with increase in Mn content. Moreover, photoluminescence band was shifted to lower energies, similarly to optical band gap. In electrical transport two mechanisms of conductivity were observed. Valence band transport dominated at higher temperatures, above 160 K, and activation energy of free-hole concentration was determined as about 0.20 eV. At lower temperatures hopping conductivity, clearly related to Mn defect band, was present. All these results were consistent with assumption of creation of Mn-related defect-band at 0.2 eV above InP valence band. It was found that Mn centers responsible for this band were in configurations of either d$\text{}^{5}$ or d$\text{}^{5}$ plus a hole localized about 7Å around corresponding Mn core.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 637-642
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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