Neutron incoherent scattering measurements were performed on (H 3O)Zr2(PO4)3 Nasicon by the quasi-elastic spectrometer INI 3 (ILL, Grenoble), to characterize the slow proton dynamics of the HaO+ ion in this compound. Both quasi-elastic and elastic data were collected at temperatures above and below the order-disorder phase transition (Tc = 177 K). Quasi-elastic contributions with peak full widths at half-maximum of 12 and 33 μeV (corresponding to proton jumping times of 110 and 40 ps) were determined at 150 and 200 K, respectively. This supports a confined proton motion both above (faster) and below (slower) the transition temperature, consistent with the full and partial disorder of the hydronium ion found in the high-T rhombohedral and low-T monoclinic phase, respectively, by previous neutron diffraction experiments. Results of the elastic scans vs momentum transfer and temperature are analyzed and discussed.
Bove, L., Catti, M., Paciaroni, A., Sacchetti, F. (2004). Neutron Scattering Study of the Dynamics of Hydronium Ion in (H3O)Zr2(PO4)3 Nasicon Across the Order−Disorder Transition. JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL, 108(26), 8910-8914 [10.1021/jp037463m].
Neutron Scattering Study of the Dynamics of Hydronium Ion in (H3O)Zr2(PO4)3 Nasicon Across the Order−Disorder Transition
CATTI, MICHELE;
2004
Abstract
Neutron incoherent scattering measurements were performed on (H 3O)Zr2(PO4)3 Nasicon by the quasi-elastic spectrometer INI 3 (ILL, Grenoble), to characterize the slow proton dynamics of the HaO+ ion in this compound. Both quasi-elastic and elastic data were collected at temperatures above and below the order-disorder phase transition (Tc = 177 K). Quasi-elastic contributions with peak full widths at half-maximum of 12 and 33 μeV (corresponding to proton jumping times of 110 and 40 ps) were determined at 150 and 200 K, respectively. This supports a confined proton motion both above (faster) and below (slower) the transition temperature, consistent with the full and partial disorder of the hydronium ion found in the high-T rhombohedral and low-T monoclinic phase, respectively, by previous neutron diffraction experiments. Results of the elastic scans vs momentum transfer and temperature are analyzed and discussed.
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