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Wyszukujesz frazę "Kościelska, B." wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
Transport Properties of Nitrided $VN-SiO_{2}$ Sol-Gel Derived Films
Autorzy:
Kościelska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1431203.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
74.78.-w
74.70.Ad
Opis:
This work presents transport properties of $xVN-(100-x)SiO_{2}$ (where x = 90, 80, 70, 60 mol%) films. The films were prepared by thermal nitridation of sol-gel derived $V_{2}O_{3}-SiO_{2}$ (in proper molar ratio) coatings. The coatings obtained by sol-gel method are especially suitable for the ammonolysis because of their porosity. The microporous structure allows both a significant incorporation of nitrogen and its distribution through the film. The nitridation process of $V_{2}O_{3}-SiO_{2}$ coatings leads to the formation of disordered structures, with VN metallic grains dispersed in the matrix of insulating $SiO_{2}$. The critical temperatures of the superconducting transition of the samples $T_\text{conset}$ are about 7.5 K.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 744-746
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting Properties of $NbN-SiO_2$ Sol-Gel Derived Thin Films
Autorzy:
Kościelska, B.
Yuzephovich, O.
Bengus, S.
Witkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1537127.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
74.78.-w
74.70.Ad
Opis:
This work presents results of superconducting properties studies of $xNbN-(100-x)SiO_2$ (where x = 80 mol%) films of the thickness from 450 to 1950 nm. The films were prepared by thermal nitridation of sol-gel derived $xNb_2O_5-(100-x)SiO_2$ coatings. The nitridation process of $Nb_2O_5-SiO_2$ coatings leads to the formation of weakly disordered structures, with NbN metallic grains dispersed in the matrix of insulating $SiO_2$. All the samples in the normal state exhibit negative temperature coefficient of resistivity. Superconducting transition was not observed for the sample 450 nm thick. To examine the influence of magnetic field on superconducting properties of the films, the resistance versus temperature of 1350 and 1650 nm thick samples was measured in high magnetic fields. Resistive superconducting transitions are broadened due to the magnetic flux creep. The perpendicular upper critical magnetic fields for 1350 and 1650 thick samples are about 4.4 T. The critical temperatures of the superconducting transitions are about 4.5 K. Specific features of the magnetic field induced superconductor-insulator transition are found.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 383-385
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
XPS Study of Superconducting $LiTi_2O_4$ and $LiTi_{2-x}Cu_{x}O_4$ Sol-Gel Derived Powders and Thin Films
Autorzy:
Łapinski, M.
Kościelska, B.
Winiarski, A.
Sadowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1374065.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.-w
81.20.Fw
Opis:
In this work X-ray photoelectron studies of lithium titanate and copper doped lithium titanate are presented. Both, powder and thin films samples were prepared by sol-gel method. After preparation, the samples were heated in argon atmosphere at various temperatures in a range from 500 °C to 600 °C for 20 h. The crystalline structure of the samples was investigated by X-ray diffraction, while the oxidation states of the elements were examined by X-ray photoelectron spectroscopy method. X-ray diffraction measurements confirmed spinel phase of all manufactured samples. However it is well known that electrical and superconducting properties of lithium titanate are strongly correlated not only with structure, but also with oxidation state of Ti ions. X-ray photoelectron spectroscopy investigations revealed mixture of $Ti^{3+}$ and $Ti^{4+}$ ions, although the $Ti^{3+}$/$Ti^{4+}$ ratio is much smaller than $1/2$ needed for superconductivity. In this work dependence between calcination temperature as well as amount of Cu dopant and $Ti^{3+}$/$Ti^{4+}$ proportion are reported.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-107-A-110
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting Properties of $VN-SiO_{2}$ Sol-Gel Derived Thin Films
Autorzy:
Kościelska, B.
Yuzephovich, O.
Bengus, S.
Winiarski, A.
Sadowski, W.
Łapiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1431327.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
74.78.-w
Opis:
In this work studies of structure and superconducting properties of $VN-SiO_{2}$ films are reported. The films were obtained through thermal nitridation (ammonolysis) of sol-gel derived $V_{2}O_{3}-SiO_{2}$ coatings (in a proper $V_{2}O_{3}//SiO_{2}$ ratio) at 1200°C. This process leads to the formation of disordered structure with VN metallic grains dispersed in the insulating $SiO_{2}$ matrix. The structural transformations occurring in the films as a result of ammonolysis were studied using X-ray photoelectron spectroscopy (XPS). The critical superconducting parameters are obtained. The magnetoresistance at high magnetic fields has been investigated.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 832-835
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Studies of Titanium Oxide Multilayers
Autorzy:
Karwasz, G. P.
Miotello, A.
Zomer, E.
Brusa, R. S.
Kościelska, B.
Armellini, C.
Kuzmin, A.
Powiązania:
https://bibliotekanauki.pl/articles/2043379.pdf
Data publikacji:
2005-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Jk
78.70.Bj
61.10.Nz
Opis:
Multilayers of titanium oxide on conductive glasses (silica, covered with indium/tin and tin oxides) were obtained by different methods (from suspension, by sol-gel, by vacuum sputtering). X-ray diffraction and positron annihilation depth-resolved characterization of these samples are presented. The data allow us to determine optimal deposition parameters, in order to obtain the anatase phase, important in practical applications in photoelectrochemical cells.
Źródło:
Acta Physica Polonica A; 2005, 107, 6; 977-982
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence of lesser white - toothed shrew Crocidura Suaveolens (Pallas, 1811) in Poland
Występowanie ziębiełka karliczka Crocidura Suaveolens (Pallas, 1811) w Polsce
Autorzy:
Cichocki, J.
Koscielska, A.
Pilacinska, B.
Kowalski, M.
Wazna, A.
Dobosz, R.
Nowakowski, K.
Lesinski, G.
Gabrys, G.
Powiązania:
https://bibliotekanauki.pl/articles/841642.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Źródło:
Zeszyty Naukowe Uniwersytetu Szczecińskiego. Acta Biologica; 2014, 21
1230-3976
Pojawia się w:
Zeszyty Naukowe Uniwersytetu Szczecińskiego. Acta Biologica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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