Physics: Recent submissions

  • Study of Sulphidation of Electrodeposited Cu2O Thin Films for Solar Cell Applications 
    Siripala, W.; Wijesundera, R.P.; Perera, L.D.R.D.; Jayasuriya, K.D. (1998)
    Cuprous oxide (Cu20 ) layers were potentiostatically electrodeposited on glass/ITO substrates and then they were partially sulphided using Na2S and H2S. Resulting layers were used to fabricate ITO/n-Cu20/p-CuxS thin film ...
  • A Correlation between activation energy and light absorption of WO3 incorporated TiO2 
    Dharmaratna, W.G.D.; Roshan, P.W.C.; Siripala, W.; Wijesundera, R.P. (2002)
    The variation of electrical conductivity properties and light absorption properties are studied in W 6+ incorporated Ti02, Both conductivity and light absorption depend on the percentage of W 6+ incorporated into the ...
  • Photoelectrolysis of water using double-semiconductor electrodes 
    Wijesundera, R.P.; Siripala, W. (2003)
    Production of hydrogen by splitting water using solar energy is an attractive method to store solar energy as chemical energy. Semiconductor material cuprous oxide (Cu20) is a candidate material for this because it possesses ...
  • Electronic Band Gap States in Electrodeposited Cuprous Oxide Semiconductors 
    Wijesundera, R.P.; Kodiweera, N.A.C.; Siripala, W.; Garuthara, R. (2004)
    Using the electrodeposition technique Cu20 thin films of n-type conductivity was deposited on ITO substrates. It was observed that the doping density of the films were very sensitive to the deposition potential. The ...
  • An experimental determination of the effect of pressure on the Fe3+/?Fe ratio of an anhydrous silicate melt to 3.0 GPa 
    Jayasuriya, K.D.; O-Neill, H.S.C.; Berry, A.J.; McCammon, C.C.; Campbell, S.J.; Foran, G. (American Mineralogist, 2006)
    The effect of pressure on the Fe3+/?Fe ratio of an anhydrous andesitic melt was determined from 0.4 to 3.0 GPa at 1400 �C with oxygen fugacity controlled internally by the Ru + RuO2 buffer. Values of Fe3+/?Fe were determined ...
  • A Mössbauer study of the oxidation state of Fe in silicate melts 
    Jayasuriya, K.D.; O-Neill, H.S.C.; Berry, A.J.; Campbell, S.J. (American Mineralogist, 2004)
    Fe3+/?Fe ratios were determined from M�ssbauer spectra recorded for a series of 17 anorthite-diopside eutectic glasses containing 1 wt% 57Fe2O3 quenched from melts equilibrated over a range of oxygen fugacities from fO2~ ...
  • Fabrication of CUO!CU2O Heterojunction and Its Local Structural Characterization 
    Siripala, W.; Wijesundera, R.P.; Perera, L.D.R.D.; Jayasuriya, K.D. (2011)
    Cuprous oxide (Cu20) thin films on Ti substrate were potentiostatically electrodeposited at -200 mV in an acetate bath. For the growth of p-type cupric oxide (CuO) thin films , CU20 thin film s were annealed at 500 oC (for ...
  • XANES calibrations for the oxidation state of iron in a silicate glass 
    Jayasuriya, K.D.; Berry, A.J.; O?Neill, H.S.C.; Campbell, S.J.; Foran, G.J. (American Mineralogist, 2003)
    Fe K-edge X-ray absorption near edge structure (XANES) spectra were recorded for a series of anorthite-diopside eutectic glasses containing 1 wt% 57Fe2O3 quenched from melts equilibrated over a range of oxygen fugacities ...
  • Photoelectrochemical Hydrogen Production Using New Combinatorial Chemistry Derived Materials 
    Baeck Sung-Hyeon; Choi Kyoung-Shin; Ivanovskaya, A.; Jaramillo, T.F.; Siripala, W.; Stucky, G.; McFarland, E.W. (2002)
    The overall project objective is the development and application of combinatorial methods to discover an efficient, practical, and economically sensible material for photoelectrochemical production of hydrogen from water ...
  • Surfactant assisted ball-milling of barium ferrite 
    Jayasuriya, K.D.; Wu, E.; Kaczmarek, W.A.; Campbell, S.J. (IEEE Transactions on Magnetics, 1994)
    The effects of wet-milling barium ferrite in the presence of cationic or anionic surface active substances have been investigated by X-ray diffraction and Mossbauer spectroscopy measurements. Evidence for superparamagnetic ...
  • Type Conversion of Electrodeposited Cuprous Oxide 
    Perera, L.D.R.D.; de Silva, K.T.L.; Siripala, W.; Jayanetti, J.K.D.S. (1996)
    Cuprous oxide is an inexpensive and non-toxic semiconductor material having a direct band gap of 2.0 eV. In view of its possible applications in low-cost solar energy converting devices thin films were fabricated and their ...
  • A Mössbauer effect study of barium ferrite ball-milled in air 
    Jayasuriya, K.D.; Kaczmarek, W.A.; Wu, E.; Campbell, S.J. (Hyperfine Interactions, 1994)
    The effects of dry-milling BaFe12O19 in air for periods of 190, 360, 590, 690 and 1000 h have been investigated by X-ray diffraction and M�ssbauer effect measurements. The sizes of the BaFe12O19 particles decrease on ...
  • The specific heat of samarium metal (80-400 K) 
    Jayasuriya, K.D.; Stewart, A.M.; Campbell, S.J. (Materials Chemistry and Physics, 1986)
    We have measured the specific heat of several high purity polycrystalline specimens of samarium metal over the temperature range 80 K to 400 K. A broad peak is observed at TNh ~106K, the temperature at which antiferromagnetic ...
  • A Mössbauer study of ball-milled Co?Fe?Si?B: I: dry milling 
    Jayasuriya, K.D.; Campbell, S.J.; Calka, A.; Jing, J. (Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993)
    X-ray diffraction and M�ssbauer effect measurements of ball-milled Co?Fe?Si?B material which had first been re-crystallized from amorphous melt-spun ribbon are presented. Fully amorphous powders have been obtained after ...
  • Potentiostatic electrodeposition of cuprous oxide thin films 
    Perera, L.D.R.D.; Siripala, W.; de Silva, K.T.L. (Journal of the National Science Council of Sri Lanka, 1996)
    Current-potential scans were used to investigate the electrodeposition of coprous oxide thin films in an acetate bath. We found that a narrow potential domain, from OV vs SCE, is available for the potentiostatic electrodeposition ...
  • A Mössbauer study of ball-milled Co?Fe?Si?B: II: with surfactants 
    Jayasuriya, K.D.; Campbell, S.J.; Calka, A.; Jing, J. (Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993)
    The use of a range of organic surface active substances in the ball milling of Co?Fe?Si?B has been studied by X-ray diffraction and M�ssbauer effect measurements. Effects characteristic of superparamagnetic relaxation of ...
  • Magnetic transitions in dysprosium: A specific-heat study 
    Jayasuriya, K.D.; Campbell, S.J.; Stewart, A.M. (Physical Review B, 1985)
    The magnetic transitions of the heavy rare-earth metal dysprosium have been examined by specific-heat measurements using a small single crystal (0.6782 g) and a large polycrystalline sample (43.25 g). A value for the latent ...
  • A specific heat study of natural haematite around the Morin transition and the effects of entrapped water 
    Jayasuriya, K.D.; Stewart, A.M.; Campbell, S.J. (Journal of Physics and Chemistry of Solids, 1985)
    The Morintransition in samples of natural haemitite has been examined by specificheat and M�ssbauer measurements. Specificheat measurements on as-received samples reveal an anomaly at ? 273.2 K and irregular behaviour at ...
  • Specific heat study of a holmium single crystal 
    Jayasuriya, K.D.; Campbell, S.J.; Stewart, A.M. (Journal of Physics F: Metal Physics, 1985)
    The magnetic transition at the Neel temperature, TN, of the heavy rare-earth metal holmium has been examined by specific heat measurements. The transition at TN=(132.245+or-0.080)K is found to be continuous and the data ...
  • Spectral responses of electrodeposited cuprous oxide thin film electrodes 
    Siripala W (Journal of the National Science Council of Sri Lanka, 1995)
    Photoresponse of the electrodeposited cuprous oxide thin film electrodes were investigated in a photoelectrochemical cell. Spectral response measurements reveal that a Schottky-type junction is formed at the junction between ...

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