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Wyświetlanie 1-15 z 16
Tytuł:
Color Centers in $Ca_4GdO(BO_3)_3$ Single Crystals Irradiated by Gamma Quanta
Autorzy:
Potera, P.
Lukasiewicz, T.
Piecuch, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400491.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.40.Fy
78.40.Ha
61.80.-x
78.20.-e
Opis:
The present work is devoted to investigation of optical absorption in pure $Ca_4GdO(BO_3)_3$ single crystals in the spectral range 0.2-1.1 μm induced under influence of the gamma quanta irradiation with absorbed dose $2 \times 10^3$ Gy. The effect of heating in air on the absorption spectrum of irradiated sample is also studied.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 122-124
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stable Color Centers Induced in Pure and Neodymium Doped $Ca_{0.28}Ba_{0.72}Nb_{2}O_{6}$ Crystals by Gamma Irradiation
Autorzy:
Potera, P.
Zhydachevskii, Ya.
Lukasiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398908.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Ed
61.72.jn
42.70.Nq
Opis:
The work is devoted to investigation of stable coloration induced by gamma radiation from $\text{}^{60}Co$ (1.25 MeV) in pure and neodymium doped $Ca_{0.28}Ba_{0.72}Nb_{2}O_{6}$ single crystals. Nature of the induced absorption is discussed. This absorption is due to charge change of native defects or ions forming of crystals (vacancy, niobium ions, etc.). The nature of color centers responsible for induced absorption is discussed.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 753-755
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Wave Measurements with a Mirage Detection for Investigation of Thermal Diffusivity of $GdCa_4O(BO_3)_3$ Single Crystals
Autorzy:
Bodzenta, J.
Kaźmierczak-Bałata, A.
Łukasiewicz, T.
Hofman, B.
Kucytowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811523.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Tv
42.70.Hj
65.40.-b
66.30.Xj
66.70.-f
Opis:
Single crystals of $GdCa_4O(BO_3)_3$ were examined to determine their thermal properties. Samples were grown by the Czochralski pulling technique. There were three types of samples: a pure crystal, the crystal doped with neodymium (4 at.% of Nd), and the third one doped with ytterbium (7 at.% of Yb). All samples were rectangular prisms with edges parallel to the axes of the optical indicatrix X, Y, Z (principal axes). The thermal diffusivity was determined by means of the thermal wave method with the optical detection of the temperature disturbance based on a mirage effect. Experimental results showed anisotropy of the thermal diffusivity. The thermal diffusivity along Y direction has the highest value while values obtained in X and Z axes are much lower. Dopants cause decrease in the thermal diffusivity for all investigated directions.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-27-A-32
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic and Laser Properties of Different Materials Doped with Pr$\text{}^{3+}$ Ions
Autorzy:
Mierczyk, Z.
Kaczmarek, S.
Kopczyński, K.
Frukacz, Z.
Pracka, I.
Łukasiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1945655.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
78.20.Dj
78.55.Hx
Opis:
Examined praseodymium doped crystals with 1 at.% of Pr$\text{}^{3+}$ ions for Y$\text{}_{3}$Al$\text{}_{5}$O$\text{}_{12}$ (YAG), SrLaGa$\text{}_{3}$O$\text{}_{7}$ (SLGO) hosts and 3 at.% of Pr$\text{}^{3+}$ ions for YAlO$\text{}_{3}$ (YAP) hosts were produced using Czochralski method. The luminescence for the range of 200÷800 nm and absorption spectra for a wide range of 200÷6000 nm, for Pr$\text{}^{3+}$:YAG, Pr$\text{}^{3+}$:SLGO and Pr$\text{}^{3+}$:YAP crystals have been measured. A free-running laser emission of λ=0.744 μm for Pr:YAG and λ=0.729 μm for Pr:SLGO for two different transmissions of output mirrors has been obtained.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 407-410
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in Luminescence of Ce:yag Crystals Under Ionizing Radiation Treatment
Autorzy:
Kaczmarek, S. M.
Moroz, Z.
Kwasny, M.
Kisielewski, J.
Lukasiewicz, T.
Wojtkowska, J.
Rzewuski, H.
Powiązania:
https://bibliotekanauki.pl/articles/2008301.pdf
Data publikacji:
1999-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ji
61.80.Ed
Opis:
Radiation induced changes in the luminescence spectrum under influence of UV light, γ-rays, electrons and protons for several concentrations of Ce$\text{}^{3+}$ ions as well as Mg$\text{}^{2+}$ ions in yttrium-aluminum garnet crystals were investigated. To irradiate with γ and electron as grown crystals were used while for proton irradiations the crystals were thermally annealed. For small concentrations of cerium ions (≈0.01 at.%) an increase in the luminescence (about 100%) was observed after gamma irradiation with a dose of 10$\text{}^{5}$ Gy. This increase was due to the growth in Ce$\text{}^{3+}$ ions concentration after γ-irradiation (≈50%), due to the Ce$\text{}^{4+}$ → Ce$\text{}^{3+}$ recharging reaction. For highly doped Ce:YAG crystals (0.1 at%, 0.2 at.%) also an increase, but much smaller (4%), for the Mg codoped crystals (0.1 at.%) was observed. After 1 MeV electron irradiation in the over-threshold type interaction a decrease in luminescence is observed due to the domination of the Ce$\text{}^{3+}$ → Ce$\text{}^{4+}$ ionization process. In the case of the proton irradiation, for small fluencies (≈10$\text{}^{13}$ particles/cm$\text{}^{2}$) an increase in luminescence is observed due to the domination of the recharging processes of Ce$\text{}^{4+}$ ions. For larger fluencies (>10$\text{}^{14}$ particles/cm$\text{}^{2}$) a decrease takes place due to a high level of radiation defects.
Źródło:
Acta Physica Polonica A; 1999, 95, 6; 953-964
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Topographic Studies of Defect Structure in $YVO_4$ Crystals
Autorzy:
Wieteska, K.
Wierzchowski, W.
Łukasiewicz, T.
Wierzbicka, E.
Malinowska, A.
Lefeld-Sosnowska, M.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1812259.pdf
Data publikacji:
2008-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
The perfection of $YVO_4$ crystals, which are predicted to replace formerly used YAG garnets due to higher quantum efficiency and lower excitation level, was studied. The investigations of Czochralski grown undoped $YVO_4$ single crystals were performed mainly by means of X-ray topographic methods. Both synchrotron and conventional X-ray sources were used. The study revealed relatively high density of weak point-like contrasts which can be most probably interpreted as dislocation outcrops. In regions of the crystal close to its boundary we observed glide bands. It was also found that in some regions the dislocations form local subgrain boundaries. The white beam back reflection and monochromatic beam topography allowed to evaluate a local misorientation which not exceeded several angular minutes. No segregation fringes were observed proving a good homogeneity of chemical composition.
Źródło:
Acta Physica Polonica A; 2008, 114, 2; 455-461
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray Topographic Investigations of Domain Structure in Czochralski Grown $Pr_{x}La_{1-x}AlO_{3}$ Crystals
Autorzy:
Wieteska, K.
Wierzchowski, W.
Malinowska, A.
Turczyński, S.
Lefeld-Sosnowska, M.
Pawlak, D.
Łukasiewicz, T.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1538809.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
81.10.Dn
61.72.Ff
Opis:
In the present paper X-ray diffraction topographic techniques were applied to a number of samples cut from Czochralski grown $Pr_{x}La_{1-x}AlO_{3}$ crystals with different ratio of praseodymium and lanthanum. Conventional and synchrotron X-ray topographic investigations revealed differently developed domain structures dependent on the composition of mixed praseodymium lanthanum aluminium perovskites. Some large mosaic blocks were observed together with the domains. In the best crystals, X-ray topographs revealed striation fringes and individual dislocations inside large domains. Synchrotron topographs allowed us to indicate that the domains correspond to three different crystallographic planes, and to evaluate the lattice misorientation between domains in the range of 20-50 arc min.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 268-271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of the Defect Structure in Gadolinum Orthovanadate Single Crystals Grown by the Czochralski Method
Autorzy:
Wierzbicka, E.
Malinowska, A.
Wieteska, K.
Wierzchowski, W.
Lefeld-Sosnowska, M.
Świrkowicz, M.
Łukasiewicz, T.
Paulmann, C.
Powiązania:
https://bibliotekanauki.pl/articles/1431600.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
The $GdVO_4$ single crystals, both undoped and doped with erbium or thulium, were studied by means of X-ray diffraction topographic methods exploring laboratory and synchrotron radiation sources. Variously developed block structure, caused probably by thermal stresses, was revealed. The highest crystallographic perfection was observed in the crystal doped with 4 at.% of thulium, which was free of the grain boundaries in the end part. Contrary to that, the differences in structural perfection between samples cut out from various regions of the crystal and for different kinds of doping, were less distinct in other crystals. The diffraction topographic methods enabled the statement that the misorientation between various blocks is in the range of several arc minutes.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 906-909
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchrotron Topographic Studies of Domain Structure in Czochralski Grown $Pr_xLa_{1-x}AlO_3$ and $Pr_xLa_{1-x-y}Mg_yAlO_3$ Crystals
Autorzy:
Wieteska, K.
Wierzchowski, W.
Malinowska, A.
Turczyński, S.
Lefeld-Sosnowska, M.
Pawlak, D.
Łukasiewicz, T.
Paulmann, C.
Powiązania:
https://bibliotekanauki.pl/articles/1431651.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
81.10.Dn
61.72.Ff
Opis:
A domain structure and crystallographic defects in Czochralski grown single crystals of $Pr_xLa_{1-x}AlO_3$ and $Pr_xLa_{1-x-y}Mg_yAlO_3$ were characterised with a number of methods including conventional and synchrotron X-ray diffraction topography, and polariscopic micrography. The observed twin domain systems were located perpendicularly to 〈100〉$\text{}_\text{pcub}$ and 〈110〉$\text{}_\text{pcub} (pseudocubic) directions. It has been confirmed that the domains are of the same orientation and a twin character as those described in literature for $LaAlO_3$ and $LaGaO_3$ crystals. The use of section transmission topography enabled to indicate that the domains are perpendicular to the $(100)_\text{pcub}$ surface of the samples. The misorientation of lattice in the domains was evaluated from the white beam topographs and a tendency of its increase with increasing concentration of praseodymium was revealed.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 910-914
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defect Structure Formed at Different Stages οf Growth Process in Erbium, Calcium and Holmium Doped $YVO_{4}$ Crystals
Autorzy:
Malinowska, A.
Wierzbicka, E.
Lefeld-Sosnowska, M.
Wieteska, K.
Wierzchowski, W.
Łukasiewicz, T.
Świrkowicz, M.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1538950.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
The defect structure of $YVO_{4}$ single crystals doped with $Er^{3+},$ $Ho^{3+}$ and $Ca^{2+}$ were studied by X-ray diffraction topographic methods, using laboratory and synchrotron radiation sources. Variously developed block structure was the dominating imperfection of the investigated crystals observed both in conventional Lang and synchrotron topographs. The evaluation of block misorientation was realised by means of superimposed projection and section white beam synchrotron radiation topographs. More possibilities of following the mutual rotation of blocks were provided by means of white beam synchrotron radiation WBSR projection topographs exposed through the fine mesh.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 328-331
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic and Laser Properties of LiNbO$\text{}_{3}$:Dy$\text{}^{3+}$ Crystals
Autorzy:
Malinowski, M.
Myziak, P.
Piramidowicz, R.
Pracka, I.
Łukasiewicz, T.
Surma, B.
Kaczmarek, S.
Kopczyński, K.
Mierczyk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1945542.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Ht
78.40.Ha
78.47.+p
78.55.Hx
Opis:
The spectroscopic properties of trivalent dysprosium (Dy$\text{}^{3+}$) doped LiNbO$\text{}_{3}$ crystals have been investigated at various temperatures. Absorption, emission, excitation and lifetime measurements have been performed and discussed in the framework of Judd-Ofelt approach. The stimulated emission cross sections of the strongest transitions of Dy $\text{}^{3+}$ ion have been estimated. A stimulated emission has been demonstrated in the near infrared.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 181-189
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchrotron Diffraction topography in Studying of the Defect Structure in Crystals Grown by the Czochralski Method
Autorzy:
Wierzchowski, W.
Wieteska, K.
Malinowska, A.
Wierzbicka, E.
Lefeld-Sosnowska, M.
Świrkowicz, M.
Łukasiewicz, T.
Pajączkowska, A.
Paulmann, C.
Powiązania:
https://bibliotekanauki.pl/articles/1399483.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
Opis:
The synchrotron diffraction topography had been widely used for investigation of the structural defects in crystals grown by the Czochralski method. Similarly as conventional diffraction topography, the synchrotron topography consists in recording with high spatial resolution of the beam formed by the Bragg reflection from the crystal. The advantages of synchrotron sources come from the possibilities of using the wavelength from a wide spectral range, improved high spatial resolution and collimation of the beam as well as from shortening the time necessary for the investigation. The synchrotron diffraction topography includes experimentally simpler white beam topography and more complicated monochromatic beam (multicrystal) topography, where the beam is formed by monochromators. In the case of Czochralski-grown crystals the synchrotron diffraction topography can be used for studying of the individual dislocations and their complexes such as glide bands or sub-grain boundaries, individual blocks, twinning, the domain structure and various segregation effects negatively affecting crystal properties. In addition, the topographical investigation can provide information concerning the reasons for the generation of defects, useful in the improving of the technology. In the present paper the possibilities of the synchrotron diffraction topography are discussed on the basis of several investigations of the Czochralski-grown oxide and semiconductor crystals, performed by the authors at HASYLAB. The majority of the results concern the oxide crystals grown at the Institute of Electronic Materials Technology, in particular garnets, orthovanadates, mixed calcium barium and strontium niobates as well as praseodymium lanthanum aluminates.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 350-359
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mining Associations on the Warsaw Stock Exchange
Autorzy:
Karpio, K.
Łukasiewicz, P.
Orłowski, A.
Ząbkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1400174.pdf
Data publikacji:
2013-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
07.05.Kf
07.05.Rm
Opis:
Identification of patterns in stock markets has been an important subject for many years. In the past, numerous techniques, both technical and econometric, were used to predict changes in stock markets, but dependences among all the companies listed on a stock market were considered in a limited extent. Numerous studies confirm that larger stocks items appear to influence smaller ones and that, on a global level, most of the world's stock markets are integrated. Therefore, this study implements the association rules using a data mining approach to explore the co-movement between stock items listed on the Warsaw Stock Exchange. We believe that in order to describe and to understand market's behavior, data mining techniques are more flexible in use than for instance pricing models based on a finance theory. The former seems to be more effective for explaining market behavior without making particular assumptions.
Źródło:
Acta Physica Polonica A; 2013, 123, 3; 553-559
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Q-Entropy Approach to Selecting High Income Households
Autorzy:
Gajowniczek, K.
Karpio, K.
Łukasiewicz, P.
Orłowski, A.
Ząbkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1388367.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Tp
05.40.Ca
07.05.Kf
07.05.Mh
Opis:
A generalized algorithm for building classification trees, based on Tsallis q-entropy, is proposed and applied to classification of Polish households with respect to their incomes. Data for 2008 are used. Quality measures for obtained trees are compared for different values of q parameter. A method of choosing the optimum tree is elaborated.
Źródło:
Acta Physica Polonica A; 2015, 127, 3A; A-38-A-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZnCoO Films by Atomic Layer Deposition - Influence of a Growth Temperature οn Uniformity of Cobalt Distribution
Autorzy:
Łukasiewicz, M.
Witkowski, B.
Godlewski, M.
Guziewicz, E.
Sawicki, M.
Paszkowicz, W.
Łusakowska, E.
Jakieła, R.
Krajewski, T.
Kowalik, I.
Kowalski, B.
Powiązania:
https://bibliotekanauki.pl/articles/1791350.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
68.55.Nq
78.66.Hf
81.15.Kk
Opis:
We report on the structural, electrical and magnetic properties of ZnCoO thin films grown by atomic layer deposition method using reactive organic precursors of zinc and cobalt. As a zinc precursor we applied either dimethylzinc or diethylzinc and cobalt(II) acetyloacetonate as a cobalt precursor. The use of these precursors allowed us the significant reduction of a growth temperature to 300°C and below, which proved to be very important for the growth of uniform films of ZnCoO. Structural, electrical and magnetic properties of the obtained ZnCoO layers will be discussed based on the results of secondary ion mass spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, atomic force microscopy, Hall effect and SQUID investigations.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 921-923
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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