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  1. No Access

    Article

    In situ observations of bubble growth in basaltic, andesitic and rhyodacitic melts

    Bubble growth strongly affects the physical properties of degassing magmas and their eruption dynamics. Natural samples and products from quench experiments provide only a snapshot of the final state of volat...

    M. Masotta, H. Ni, H. Keppler in Contributions to Mineralogy and Petrology (2014)

  2. No Access

    Article

    Water solubility in nominally anhydrous minerals measured by FTIR and 1H MAS NMR: the effect of sample preparation

    Samples of enstatite and forsterite were crystallized in the presence of a hydrous fluid at 15 kbar and 1100 °C. Water contents in quenched samples were measured by 1H MAS NMR and by FTIR. If the samples were pr...

    H. Keppler, M. Rauch in Physics and Chemistry of Minerals (2000)

  3. No Access

    Article

    Structural changes in sodium tetrasilicate glass around the liquid-glass transition: a neutron diffraction study

    The structure of sodium tetrasilicate (Na2Si4O9) glass and melt was studied in the range from 300 to 950 K by neutron diffraction. Increasing temperature leads to gradual decrease of the peak intensities in the s...

    N. Zotov, R. G. Delaplane, H. Keppler in Physics and Chemistry of Minerals (1998)

  4. No Access

    Article

    The structure of sodium tetrasilicate glass from neutron diffraction, reverse Monte Carlo simulations and Raman spectroscopy

    The reverse Monte Carlo (RMC) method was used for modelling the three-dimensional structure of sodium tetrasilicate glass (Na2Si4O9, NS4). Neutron diffraction data over a large momentum transfer range and nuclear...

    N. Zotov, H. Keppler in Physics and Chemistry of Minerals (1998)

  5. No Access

    Article

    The investigation of phase transitions by electronic absorption spectroscopy

    Absorption spectroscopy in the near infrared, visible and ultraviolet range can detect transitions between various electronic states of the material involved (intraatomic d-d and f-f transitions, intervalence ...

    H. Keppler in Physics and Chemistry of Minerals (1996)

  6. No Access

    Article

    Solubility of water in the α, β and γ phases of (Mg,Fe)2SiO4

     The solubility of hydroxyl in the α, β and γ phases of (Mg,Fe)2SiO4 was investigated by hydrothermally annealing single crystals of San Carlos olivine. Experiments were performed at a temperature of 1000° or 110...

    D. L. Kohlstedt, H. Keppler, D. C. Rubie in Contributions to Mineralogy and Petrology (1996)

  7. No Access

    Article

    A study of bernalite, Fe(OH)3, using Mössbauer spectroscopy, optical spectroscopy and transmission electron microscopy

    To study the crystal chemistry of bernalite, Fe(OH)3, and the nature of the octahedral Fe3+ environment, Mössbauer spectra were recorded from 80 to 350 K, optical spectra were recorded at room temperature and a s...

    C. A. McCammon, A. Pring, H. Keppler, T. Sharp in Physics and Chemistry of Minerals (1995)