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  • Chemistry  (3)
  • 1990-1994  (2)
  • 1970-1974  (1)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Solid-phase transitions in TlHSO4 crystal (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 387-394 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polycrystalline TlHSO4 was investigated by calorimetry (253-423 K) and by infrared (10-300 K) and Raman (10-420 K) spectroscopy. Two phase transitions are detected at 320 and 388 K. A complete assignment of the spectra of the room-temperature phase (III) is given and the spectroscopic results are consistent with infinite chains of hydrogen bonds. This structure appears disordered above 320 K (phase II). The high-temperature phase (I) presents the characteristic features of a plastic phase according to the spectroscopic manifestations of an increasing orientational disorder of sulphate ions. Above 360 K, a metastable phase (I′) showing a complex hydrogen-bonded framework is identified.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250603
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrational study of the paraelectric superionic phase transition in ammonium hydrogenselenates, NH4HSeO4 and ND4DSeO4 (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 465-478 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman and infrared spectra of the room-temperature ‘paraelectric’ (II) and high-temperature (I) superionic phases of NH4HSeO4 and ND4DSeO4 were investigated at different temperatures in the range 300-450 K. A new intermediate phase I′ is identified on cooling phase I. A complete assignment of the bands of phase II is given and the spectroscopic manifestations of the structural disorder due to both the statistical distribution of OH … O protons and orientational disorder of ammonium ions were studied. In the superionic phase I infinite (HSeO4-)n chains are broken and open dimers appear to be formed. There is increasing orientational disorder of both ammonium and HSeO4- ions resulting in a plastic state. Hydrogen bonding in various phases is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250210802
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  • 3
    Electronic Resource
    Electronic Resource
    Spectres Raman de Basses Frequences de Cristaux de Derives Benzeniques Paradisubstitues: p-Br2C6H4, p-Br2C6D4, p-BrClC6H4 et p-ClC6H4. Étude du désordre dans le dérive p-BrClC6H4 (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 431-442 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An assignment of the Raman active lattice modes in terms of factor group symmetry species and rotational vibrations is given for paradibromobenzene-H4 and -D4, parabromochlorobenzene and parachloroiodobenzene. The analysis of the Raman spectra of mixed crystals of paradibromobenzene and paradichlorobenzene at 90K with 1 cm-1 resolution and the temperature dependence of the linewidths of the three librations are evidence for the static nature of the disorder in the unsymmetrical derivatives.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020414
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