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  • 1
    Electronic Resource
    Electronic Resource
    A New High-Resolution X-ray Powder Diffractometer Working in the 3–470 K Range for Phase-Transition Analyses (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 29 (1996), S. 692-699 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A high-resolution X-ray powder diffractometer is described with a source operating from 3 to 470 K. The optical design and mechanical arrangement of the diffractometer and the cryostat are optimized to provide easy (re)alignment procedures and high accuracy when the wavelength, the sample or the temperature is changed. The apparatus has been tested for peak-position accuracy, angular sensitivity and resolution (using standard materials). The tests assess the overall performance of the instrument, which is comparable to (or slightly better than) the best commercial instruments, but clearly excels over them because these performances are the same over the whole temperature range (3–470 K), allowing very accurate determination of the lattice parameters and crystal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889896007601
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  • 2
    Electronic Resource
    Electronic Resource
    An Easy Method for the Determination of Debye Temperature from Thermal Expansion Analyses (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 31 (1998), S. 121-127 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A combination of the early approaches of the Debye model for specific heat and the Grüneisen theory of the thermal expansion of solids is used to interpolate the thermal variation of lattice parameters. From this analysis, relevant parameters such as the Debye temperature and the value of lattice parameters extrapolated at 0 K are deduced. This method and its limitations are reported. A program has been developed which can be readily used with any computer. Practical applications are given as an illustration. The method is first applied to an ideal cubic compound Na2Ca3Al2F14, which we propose as a standard for thermal expansion calibrations. Then, magnetoelastic phenomena, which occur at very low temperature, are displayed in cubic rare earth garnets by comparison of experimental and extrapolated data. The model is extended to an anisotropic hexagonal system, where the values of lattice parameters extrapolated at 0 K are determined within 10−5. Debye temperatures are estimated within a relative error of 10% and are in good agreement with those calculated from specific heat data; they prove the relevance of this easy method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897006936
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal behaviour of (TMTSF)"2ClO"4 lattice parameters in the range 10K-300K
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 235-240 (1994), S. 2459-2460 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0921-4534(94)92450-3
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  • 4
    Electronic Resource
    Electronic Resource
    Diffraction study of the piezoelectric properties of low quartz (2004)
    Springer
    The European physical journal 42 (2004), S. 373-380 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The effect of a static electric field on the crystal structure of $\alpha $ -quartz has been determined by Xray diffraction on single crystals. By a stroboscopic technique rocking curves are measured quasi simultaneously for zero field and for two opposite strong fields (28.8 kV/cm) applied in the direction of the crystallographic a-axis. The relative intensity-changes of high order reflections (i.e. sensitive to the core electrons) were measured and analysed by a least squares method technique. The analysis indicates that the bond distances Si-O are very little affected by the field, but both a deformation and a reorientation of the SiO4 tetrahedra are induced. The model is qualitatively in agreement with the small amplitudes of the induced polarisation and the piezoelectric coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00393-4
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  • 5
    Electronic Resource
    Electronic Resource
    Microwave transport approach to the coherence of interchain hopping in (TMTSF) PF (1999)
    Springer
    The European physical journal 10 (1999), S. 305-309 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 67.55.Hc Transport properties - 71.27.+a Strongly correlated electron systems, heavy fermions - 71.10.Pm Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report a microwave study of the longitudinal and transverse transport properties of the quasi-one-dimensional organic conductor (TMTSF)2PF6 in its normal phase. The contactless technique have provided a direct measurement of the temperature profile of the resistivity along the b' direction and in magnetic fields up to 14 T. A characteristic energy scale ( K) has been observed which delimits a transient regime from an insulating to a metallic behavior. This anomalous profile is discussed in terms of the onset of coherent transport properties along the b' direction below 40 K. This is also supported by the observation of a finite longitudinal and transverse magnetoresistances only below 40 K, indicative of a two-dimensional regime. Below Tx, however, strong deviations with respect to a Fermi liquid behavior are evidenced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050859
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