Elastic and quasielastic neutron scattering studies in KBr:KCN mixed crystals View Full Text


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Article Info

DATE

1989-03

AUTHORS

A. Loidl, T. Schräder, K. Knorr, R. Böhmer, B. Mertz, G. J. McIntyre, T. Vogt, H. Mutka, M. Müllner, H. Jex, S. Haussühl

ABSTRACT

Neutron scattering studies in (KBr)1−x(KCN)x mixed crystals are presented utilizing powder diffraction, single crystal diffraction and time-of-flight techniques. Forx>0.6 (KBr)1−x(KCN)x crystals exhibit ferroelastic and ferroelectric low-temperature phases. Crystals withx<0.6 undergo transitions into an orientational glass state. Here we present a detailed phase diagram including new results for x=0.85 and x=0.65. For the latter system a stable rhombohedral low-temperature phase has been detected where the orientational disorder of the plastic phase is only partly removed and quadrupolar relaxations between three body diagonals are still possible. From the powder diffraction experiments we determined further the concentration dependence of the static Debye-Waller factors which can be explained by an interplay of the rotation-translation and the rotation-random strain coupling. With single crystal diffraction techniques we studied the diffuse scattered intensities which are directly related to the order parameter of the glass state. The temperature dependence of the quasielastic intensities near the critical concentration shows a strong increase forT<110K indicative for a freezing-in of shear fluctuations which is a characteristic feature of a non-ergodic instability. This phenomenon appears for ordering (x=0.65) and for non-ordering, glassy compounds. A further anomaly in (KBr)0.43(KCN)0.57 at 75 K is interpreted in terms of a residual elastic ordering process. With high-resolution time-of-flight techniques we analysed the dynamic structure factor for x=0.57. We demonstrate that the central peak consists of a static and a dynamic component. The results are compared with mode coupling theories which describe the glass transition in supercooled liquids. More... »

PAGES

81-99

References to SciGraph publications

  • 1988-09. Non-ergodic instability and the quadrupolar glass state in K(CN)xBr1−x and (NaCN)x(KCN)1−x in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1983-09. On the phase transition in CsCN in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1982-03. Frozen-in orientational disorder in mixtures of solid nitrogen and argon in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1987-06. Monte Carlo investigation of a model for a three-dimensional orientational glass with short-range gaussian interaction in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1987-12. The glass transition singularity in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1976-03. Critical statics of elastic phase transitions in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1985-06. Phases and phase transitions of (NaCl)1−x(NaCN)x in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1981-06. Orientational glass behaviour of K Br0.96(CN)0.04 in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1987-06. The orientational glass instability and localization in (KCN)x(KBr)1−x and (KCN)x(NaCN)1−x in ZEITSCHRIFT FÜR PHYSIK B CONDENSED MATTER
  • 1972-05. Tunneling states in amorphous solids in JOURNAL OF LOW TEMPERATURE PHYSICS
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    73 ordering process
    74 orientational disorder
    75 orientational glass state
    76 parameters
    77 peak
    78 phase
    79 phase diagram
    80 phenomenon
    81 plastic phase
    82 powder diffraction
    83 powder diffraction experiments
    84 process
    85 quadrupolar relaxation
    86 quasielastic intensity
    87 quasielastic neutron
    88 relaxation
    89 results
    90 rhombohedral low-temperature phase
    91 shear fluctuations
    92 single crystal diffraction
    93 single crystal diffraction technique
    94 state
    95 static
    96 static Debye-Waller factor
    97 strain coupling
    98 strong increase
    99 structure factor
    100 study
    101 system
    102 technique
    103 temperature dependence
    104 terms
    105 theory
    106 time
    107 transition
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