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Browsing by Author "Campbell, S.J."

Browsing by Author "Campbell, S.J."

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  • 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 ...
  • 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 ...
  • 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 ...
  • 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~ ...
  • 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 ...
  • 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 ...
  • Crystallization and preliminary x-ray analysis of shikimate dehydrogenase from Escherichia coli 
    Maclean, J.; Campbell, S.J.; Pollock, K.; Chackrewarthy, S.; Coggins, J.R.; Lapthorn, A.J. (Wiley-Blackwell, 2000)
    Abstract
  • 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 ...
  • 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 ...
  • Specific heat study of the transition from ferromagnetism to antiferromagnetism in terbium 
    Jayasuriya, K.D.; Campbell, S.J.; Stewart, A.M.; Gopal, E.S.R. (Journal of Magnetism and Magnetic Materials, 1984)
    The specificheat of single crystal terbium has been measured over the range 200?400 K. A value for the latent heat of (13.6 � 0.6) J mol?1 is obtained at the first order antiferromagnetic to ferromagnetic transition ...
  • 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 ...
  • The critical specific heat of terbium 
    Jayasuriya, K.D.; Gopal, E.S.R.; Campbell, S.J.; Stewart, A.M. (Journal of Physics F: Metal Physics, 1983)
    Specific heat measurements have been carried out on a high-purity single crystal of terbium of mass 3.734 g between temperatures of 200 and 400K. The data around the Neel temperature TN, have been analysed in terms of the ...
  • The specific heat capacity of GE varnish (200-400K) 
    Jayasuriya, K.D.; Campbell, S.J.; Stewart, A.M. (Journal of Physics E: Scientific Instruments, 1982)
    The specific heat capacity of GE varnish, a commonly used adhesive and insulator, is found to vary linearly with temperature over the range 200-330K. The deviation of the heat capacity above this temperature is associated ...
  • 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 ...
  • 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 ...

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