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  • 1
    Monographie ausleihbar
    Monographie ausleihbar
    Phase transitions in ferroelastic and co-elastic crystals : an introduction for mineralogists, material scientists and physicists (1993)
    Cambridge : Cambridge University Press
    Dazugehörige Bände
    Details Verfügbarkeit
    Signatur: 11/M 93.0959
    In: Cambridge topics in mineral physics and chemistry
    Materialart: Monographie ausleihbar
    Seiten: 229, Al S.
    ISBN: 0521384494
    Serie: Cambridge topics in mineral physics and chemistry 1
    Klassifikation:
    Mineralogie
    Sprache: Englisch
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Formation of needle shaped twin domains in cordierite: A computer simulation study (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2414-2422 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The formation of needle shaped domains in cordierite is simulated using a simplified two-dimensional computer model with hexagonal symmetry and nonlocal (strain-induced) atomic interactions. Domain walls form along elastically soft directions as expected and sometimes needle domains appear during annealing. During annealing needles are then consumed by the coarsening process or retract into the domains to which they are attached. Needles have rounded, parabolic tips symptomatic of cordierite's comparatively low anisotropy energy. Needle splitting is not observed but a novel wetting mechanism by which auxiliary domains form at the needle tip is observed. These domains form such as to make a section of the needle tip a strain allowed domain wall and so reduce the bending energies of the domain walls in this region. At higher temperatures, needle domain walls become only poorly orientated along soft directions and needle domains become patchy with blunt tips and increased "wetting" at the needle tips. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.369559
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  • 3
    Digitale Medien
    Digitale Medien
    Temperature dependence of the domain wall width in LaAlO3 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 722-727 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Twin wall related diffuse scattering intensities from a single crystal of LaAlO3 were determined using high-resolution x-ray diffraction methods. Rocking curves were measured for sample temperatures between 295 and 900 K. The wall thickness W was determined by comparing the observed diffraction profiles with structure factor calculations for a tanh(x/W) wall profile. It is shown that W(approximate)20 Å at low temperatures and increases slowly with temperature reaching values in excess of 200 Å near Tc(approximate)850 K with W∝|T−Tc|−1. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.369152
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  • 4
    Digitale Medien
    Digitale Medien
    Annealing Metamict Zircon: A Powder X-ray Diffraction Study of a Highly Defective Phase (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: The transition from highly defective (metamict) to crystalline zircon is characterized by short-range structural order, which follows a different kinetic behavior than the corresponding long-range order. Experimental results from in situ powder X-ray diffraction experiments are analyzed using Rietveld refinement and direct Fourier analysis. The Rietveld refinement leads to a detailed assessment of the structural contraction of the crystalline portion of the same during thermal annealing. The Fourier analysis shows a highly heterogeneous distribution of interatomic bond distances. The main effect of structural annealing is a change of the distances between Si and O atoms and the average Si–Zr distance. The Zr–Zr distance seems to be less affected by this thermal treatment. Short-range order is recovered at lower temperatures than that of long-range order. Crystallinity is recovered anisotropically with slower annealing along the crystallographic c-direction than along the a-direction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb02146.x
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  • 5
    Digitale Medien
    Digitale Medien
    Towards a better understanding of time-dependent geological processes: kinetics of structural transformations in mineraIs (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 1 (1989), S. 0 
    Details
    ISSN: 1365-3121
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Recent advances in the theoretical understanding of kinetic processes in minerals are outlined. It is shown that relevant temperature-pressure-time information on the geological history of rocks can be extracted from a detailed knowledge of the structural states of some of the constituent mineral phases. Kinetic rate laws for the transformation between these structural states have been derived from order parameter theories (Salje; Salje and Wruck); some of the underlying ideas are reviewed in this paper. Recent progress in the experimental determination of the relevant thermodynamic potentials now makes it possible to treat non-equilibrium features in a similar way to equilibrium states. The conceptual framework of such investigations is explained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3121.1989.tb00323.x
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  • 6
    Digitale Medien
    Digitale Medien
    Superconductivity and Earth Sciences (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 1 (1989), S. 0 
    Details
    ISSN: 1365-3121
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3121.1989.tb00320.x
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  • 7
    Digitale Medien
    Digitale Medien
    Localized defects in radiation-damaged zircon (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 947-952 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The crystal structure of a radiation-damaged natural zircon, ZrSiO_{4} (\alpha-decay radiation dose is ca 1.8 × 10^{18} α-decay events g−1), has been determined. The anisotropic unit-cell swelling observed in the early stages of the amorphization process (0.17% along the a axis and 0.62% along the c axis compared with the undamaged material) is a consequence of the anisotropy of the expansion of ZrO_{8} polyhedra. Larger anisotropic displacement parameters were found for Zr and O atoms, indicating that the distortion produced by \alpha particle-induced localized defects mainly affects the ZrO_{8} unit. The overall shape of SiO_{4} tetrahedra remains essentially undistorted, while Si—O bonds are found to lengthen by 0.43%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108768100008582
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  • 8
    Digitale Medien
    Digitale Medien
    X-ray diffraction study of the orientational order/disorder transition in NaNO3: Evidence for order parameter coupling (1989)
    Springer
    Physics and chemistry of minerals 16 (1989), S. 790-798 
    Details
    ISSN: 1432-2021
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Abstract The orientational ordering transition R $$R\bar 3m - R\bar 3c$$ in NaNO3 near 552 K has been investigated using x-ray diffraction techniques. NaNO3 is a model system for CaCO3 and other minerals with orientational disorder of triangular molecules in a simple NaCl-type matrix. The temperature evolution of the integrated intensities of the superlattice reflection $$\bar 1$$ 23 and the fundamental reflection 110 are discussed in terms of Landau theory of two coupled order parameters. It is shown that the known phenomenological critical exponent (Poon and Salje 1988) and the anomalous thermal expansion at T 〉 T tr (Reeder et al. 1988) can be understood as the result of a Z point instability which mainly describes the NO 3 - disorder, and a second order parameter linked with the spontaneous strain of this phase transition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00209703
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  • 9
    Digitale Medien
    Digitale Medien
    Spontaneous strain at the structural phase transition in NaNO3 (1988)
    Springer
    Physics and chemistry of minerals 15 (1988), S. 605-611 
    Details
    ISSN: 1432-2021
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Abstract The temperature dependence of the hexagonal c unit cell parameter of high-purity NaNO3 shows an anomaly at 553 K corresponding to the orientational ordering transition. The a unit cell parameter is barely influenced by the transition. The single component spontaneous strain for this zone boundary instability is large (∼55×10−3 at 295 K), and couples quadratically with the order parameter. The critical exponent β is found to have the value 0.22 ± 0.01, which differs from that expected in the classical case. Below ca 450 K, crossover to tricritical behaviour is observed (β=1/4). The temperature evolution of the macroscopic order parameter as revealed by the temperature dependence of the spontaneous strain follows a tricritical behaviour between 70 K and 450 K. At temperatures below 70 K order parameter saturation is observed. Combined with recent data from specific heat measurements, the critical exponents suggest that the three-dimensional, three-states Potts model may describe the transition. Precursor spontaneous strain above T c is consistent with local ordering and may result from fluctuations associated with an antiordered NO3 group pair configuration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00311033
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  • 10
    Digitale Medien
    Digitale Medien
    Thermodynamics of plagioclase III: Spontaneous strain at the $$I\overline 1 - P\overline 1$$ phase transition in Ca-rich plagioclase (1988)
    Springer
    Physics and chemistry of minerals 16 (1988), S. 157-163 
    Details
    ISSN: 1432-2021
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Abstract The lattice parameters of anorthites An98Ab2 and An100 have been measured from 22 to 1100 K. The spontaneous strain arising from the $$I\overline 1 - P\overline 1$$ displacive transition in An98 follows second order Landau behaviour. The spontaneous strain (ɛ s) couples quadratically to the order parameter (Q 0) with ɛ s∝Q 02∝(T c * −T) and T c * =530 K in An98. This is in contrast to the tricritical behaviour observed in pure anorthite. These observations are consistent with a Landau model for the free energy of Ca-rich plagioclases in which Al/Si order and Na content renormalize the fourth order coefficient.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00203199
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