Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts

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Main results RARE EARTH ACTIVATED OXYFLUORIDE GLASSES AND GLASS- CERAMICS FOR SCINTILLATION APPLICATIONS U. Rogulis, E. Elsts, J. Jansons, A. Sarakovskis, G. Doke, A. Stunda, K. Kundzins Oxyfluoride glasses 49SiO 2 · 6Al 2 O 3 · 24Li 2 O · 20LaF 3 activated with Tb, Ce, Eu have been synthesized and studied. After heating at 580 0 C and 750 0 C crystalline phases were obtained. The samples were studied by DTA (Differential thermal analyzer), CL (cathodoluminescence), XRD (X – ray diffraction), SEM (scanning electron microscope), EDS (energy dispersive x-ray spectroscopy) methods. We found out that presence of crystalline phase enhances the CL of Tb activated samples significantly; whereas, the shortest decay time of 0.29 μs has been observed for less intense Ce doped glass sample. PHOTOLUMINESCENCE OF Eu AND Ce ACTIVATED OXYFLUORIDE GLASS AND GLASS CERAMICS I. Brice, U. Rogulis, E. Elsts, J. Grūbe The photoluminescence of SiO 2 -Al 2 O 3 -LiO 2 -LaF 3 oxyfluoride glass and glass ceramic samples doped with Ce 3+ , Eu 2+ and Ce 3+ /Eu 2+ is investigated. The spectra and fluorescence intensities are compared. The luminescence of samples activated by Eu ions is found to be of greater intensity than that of the samples doped with Ce or Ce/Eu. The luminescence of glass ceramics is higher than that of the corresponding glass, which indicates that a proportion of the activator ions is embedded in the fluoride crystallites. EPR SPECTRUM ANGULAR DEPENDENCES IN LiYF 4 CRYSTAL A. Antuzevičs, A. Fedotovs, U. Rogulis Electron paramagnetic resonance (EPR) measurements have been made for two perpendicular planes in a LiYF 4 crystal before and after x-ray irradiation at room temperature. Analysis of the EPR spectrum angular dependence shows the presence of two defects – an impurity ion, which was embedded during the crystal growth process, and an x-ray induced defect with the g-factor of approx. 2.0. Parameters of the spectra and possible defect models are discussed. EPR HYPERFINE STRUCTURE OF RADIATION DEFECT IN OXYFLUORIDE GLASS CERAMICS Dz. Berzins, A. Fedotovs, U. Rogulis We have investigated the samples of thermally treated oxyfluoride glass ceramics 50SiO 2 – 25LiO 2 – 20YF 3 – 3ErF 3 – 2YbF 2 by means of electron paramagnetic resonance (EPR) techniques. After irradiation of the samples with X-rays, in the EPR spectra a hyperfine structure characteristic of F-centres could be observed in different fluoride crystals. The structure of F-centre in the oxyfluoride glass ceramics containing LiYF 4 crystallites is discussed. 16
Scientific publications 1. U. Rogulis, E. Elsts, J. Jansons, A. Sarakovskis, G. Doke, A. Stunda, K. Kundzins, Rare earth activated oxyfluoride glasses and glass-ceramics for scintillation applications, IEEE Transactions on Nuclear Science, 2012, Volume: 59 , Issue: 5, Page(s): 2201 – 2206, Doi: 10.1109/ TNS.2012.2212724. 2. I. Brice, U. Rogulis, E. Elsts, J. Grūbe, Photoluminescence of Eu and Ce activated oxyfluoride glass and glass ceramics. Latvian Journal of Physics and Technical Sciences, 2012, Nr. 6(I), p. 44. 3. A. Antuzevičs, A. Fedotovs, U. Rogulis, EPR spectrum angular dependences in LiYF 4 crystal, Journal of Physics and Technical Sciences, 2012, Nr. 6(i), p. 49. 4. Dz. Berzins, A. Fedotovs, U. Rogulis, EPR hyperfine structure of radiation defect in oxyfluoride glass ceramics, Latvian Journal of Physics and Technical Sciences, 2012, Nr. 6(I), p. 55. Lectures on Conferences 1. U. Rogulis, E. Elsts, J. Jansons, A. Sarakovskis, G. Doke, A. Stunda, K. Kundzins, Cathodoluminescence of oxyfluoride glass-ceramics, Abstracts International Conference LUMDETR'2012, Halle, Germany, 2012, P-Tue-2168. 2. E. Elsts, J. Jansons, U. Rogulis, A. Sarakovskis, G. Doke, A. Stunda, K. Smits, Rare earth activated oxyfluoride glass-ceramics for scintillation applications, Abstracts International Conference LUMDETR'2012, Halle, Germany, 2012, P-Tue-2169. 3. E.Elsts, J.Jansons, U.Rogulis, A.Šarakovskis, G.Doķe, A.Stunda, K.Kundziņš, Oksifluorīdu stikla keramikas katodluminiscence, LU CFI 28. zinātniskās konferences tēzes, 2012, 30. lpp. 4. I.Brice, U.Rogulis, E.Elsts, J.Grūbe, L.Skuja, Eu un Ce jonu luminiscence oksifluorīdu stikla keramikā, LU CFI 28. zinātniskās konferences tēzes, 2012, 75. lpp. 5. A.Antuzevičs, A.Fedotovs, U.Rogulis, EPR spektru leņķisko atkarību modelēšana LiYF 4 kristālā, LU CFI 28. zinātniskās konferences tēzes, 2012, 78. lpp. Master thesis: 1. Olga Kiseļova, "CaF 2 , BaF 2 un SrF 2 nanokristālu struktūru pētījumi oksifluorīdu stikla keramikās ar EPR paramagnētisko zonžu metodi", vad. A. Fedotovs Bachelor thesis: 1. Andris Antuzevičs, "EPR spektru leņķisko atkarību modelēšana LiYF 4 kristālā", vad. U. Rogulis 2. Ludmila Jefimova, "Oksifluorīdu stikla keramiku punktveida defektu pētījumi", vad. U. Rogulis 17
Page 1 and 2: Institute of Solid State Physics Un
Page 3 and 4: CONTENTS Introduction 4 Department
Page 5 and 6: ORGANIZATIONAL STUCTURE OF THE ISSP
Page 7 and 8: The annual report summarizes the re
Page 9 and 10: The main source for international f
Page 11 and 12: lector at the Faculty of Physics an
Page 13 and 14: the samples having different phase
Page 15: LABORATORY OF MAGNETIC RESONANCE SP
Page 19 and 20: Main investigations and results ALU
Page 21 and 22: Lectures on Conferences 28 th LU Sc
Page 23 and 24: Main Results LASER CRYSTALLIZATION
Page 25 and 26: CONTROLLED MANIPULATION AND MECHANI
Page 27 and 28: DEPARTMENT OF FERROELECTRICS Head o
Page 29 and 30: Belorussia 1. Institute of solid st
Page 31 and 32: Density and dielectric properties f
Page 33 and 34: CONCENTRATION AND THERMAL PHASE TRA
Page 35 and 36: Latvia; SSPA ”Scientific-Practica
Page 37 and 38: • Δ T εmax : Mn>Co>Fe>Cu~Ni •
Page 39 and 40: Li x Na 1-x Ta y Nb 1-y O 3 Solid S
Page 41 and 42: 34. А.И. Бурханов, И.Е.
Page 43 and 44: 16. Š. Svirskas, M. Ivanov, Š. Ba
Page 45 and 46: 45. С.Н. Каллаев, А.Р.
Page 47 and 48: LABORATORY OF VISUAL PERCEPTION Hea
Page 49 and 50: in terms of colour coordinate dispe
Page 51 and 52: 4. R.Truksa, S.Fomins, M.Ozolins, "
Page 53 and 54: Scientific visits abroad 1. Dr. hab
Page 55 and 56: experimental data. We focused on th
Page 57 and 58: GB1 with oxygen vacancy revealed th
Page 59 and 60: Fig. 4. The thermodynamic stability
Page 61 and 62: a supercell model was used, and the
Page 63 and 64: a) b) l [110] d [110] (001) Fig. 9.
Page 65 and 66: Drain CNT Source Drain GNR Source 5
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The oxygen incorporation energy for
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such as high thermal stability, ver
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STATISTICAL ANALYSIS AND CELLULAR A
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REGIONS OF AZIMUTHAL INSTABILITY IN
Page 75 and 76:
25. A. Gopejenko, Yu.F. Zhukovskii,
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15. S. Piskunov and E. Spohr, "SrTi
Page 79 and 80:
43. P. Merzlakov, G. Zvejnieks, V.N
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XII. Annual Monitory Meeting of Eur
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91. L. Shirmane, A.I. Popov, V. Pan
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115. A.I. Popov, J. Zimmermann, V.
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Estonia Institute of Physics, Tartu
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5. Grigorjeva L., Jankoviča D., Sm
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LABORATORY OF AMORPHOUS MATERIALS S
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Main results ABSORPTION AND LUMINES
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LUMINESCENCE OF FUSED AND UNFUSED B
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enables sensitive and selective det
Page 99 and 100:
LABORATORY OF OPTICAL RECORDING Hea
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HOLOGRAPHIC LITHOGRAPHY IN AMORPHOU
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5. U.Gertners, J.Teteris, The impac
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24. J.Aleksejeva, J.Teteris, A.Tokm
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Israel Technion, Haifa (Dr.S.Stolya
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3. A. Rusakova, J. Maniks, K. Schwa
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• Investigation of energetic stru
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Scheme 2 Synthesis of indane-1,3-di
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The synthesized compounds ZWK-1, DW
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7. A. Vembris, K. Pudzs, I. Muzikan
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20. A. Vembris, K. Pudzs, I. Muzika
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• Ion transfer problems related t
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13. SIA „EMU PRIM”, 14. JSC „
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Main results Laboratory of Solid St
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Flax and Hemp Fiber Functionalizati
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CHARACTERIZATION OF LiFePO4/C COMPO
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Fig.1. Upper panel: 4 × 4 ×4 supe
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Fig.1. Left panel: Schematic view o
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Titania with anatase structure is i
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RESEARCH OF CATHODE MATERIALS FOR L
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17. T Dizhbite, J Ponomarenko, A An
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6. J. Kleperis, B. Sloka, J. Dimant
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33. P. Lesnicenoks, A. Sivars, L. G
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France 1. Institute Laue-Langevin,
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different neutron orbits (11/2[615]
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LABORATORY OF ELECTRONIC ENGINEERIN
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2. For JSC Augstsprieguma tīkls an
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4. By orders of several organizatio
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Partners: Fonons Ltd, Riga Technica
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Annual Report 2012 - Latvijas Universitātes Cietvielu fizikas institūts

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