16 research outputs found
Discriminating Lattice Structural Effects from Electronic Contributions to the Superconductivity of Doped MgB 2
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Synthesis and Characterizationof a Novel Germanate Material Containing 16-Ring Channels and Templated by a Simple Primary Amine
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Synthesis, Characterization, and Separation Properties of Sn− and Ti−Silicate Umbite Membranes
No full textKinetics of ordering in as revealed by the variation of the lattice parameters upon annealing
No full textInternational audienceX-ray powder diffraction was employed to reveal the structural changes occurring upon annealing of quenched, hexagonal Ni<sub>1.50</sub>Sn below its equilibrium ordering temperature, leading finally to long-range ordered, orthorhombic Ni<sub>1.50</sub>Sn. The changes in the diffraction patterns indicate that the features of the low-temperature phase develop gradually in two main stages. Ex-situ and in-situ time-resolved X-ray powder diffraction analysis of the first stage was employed to monitor at various temperatures in particular the time dependence of the lattice axial ratio c/a associated with the formation of long-range order in small domains. Data evaluation using an 'equivalence-time' method gave a value of 165-170 kJ/mol for the activation energy of the ordering, indicative of lattice-site changes of Ni atoms
Crystal Structure, Phase Transition and Thermal Behaviour of Dabcodiium hexaaquacopper(II) bis(selenate/sulfate), (C6H14N2)[Cu(H2O)6](S0.66Se0.34O4)2
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