Tweed microstructures: Experimental observations and some theoretical models
- 1 March 1994
- journal article
- research article
- Published by Taylor & Francis in Phase Transitions
- Vol. 48 (1-3) , 85-105
- https://doi.org/10.1080/01411599408200355
Abstract
Experimental observations, mainly by transmission electron microscopy, of tweed microstructures in minerals (K-feldspar and cordierite), high-T c superconductors (Co-doped YBCO) and metals are reviewed. Structural models of the local structure within the tweed are compared and evaluated with respect to spectroscopic measurements in a number of systems. It is concluded that in tweed microstructures which result from symmetry changes driven by cation-ordering, the local degree of order is not itself modulated. A model based on twin-related domains of the low symmetry form is consistent with experimental observations. Mechanisms of coarsening of the tweed microstructure to form the lamellar twinning observed in the fully ordered structure are briefly reviewed.Keywords
This publication has 41 references indexed in Scilit:
- Annealing of tweed microstructure in high Tc superconductors studied by a computer simulationActa Metallurgica et Materialia, 1993
- Relaxations near surfaces and interfaces for first-, second- and third-neighbour interactions: theory and applications to polytypismJournal of Physics: Condensed Matter, 1992
- Two forms of Pf1Inovirus: X-ray diffraction studies on a structural phase transition and a calculated libration normal mode of the asymmetric unitPhase Transitions, 1992
- Microstructures in high TcsuperconductorsSuperconductor Science and Technology, 1991
- Structural states of Mg cordierite. IV. Raman spectroscopy and local order parameter behaviourJournal of Physics: Condensed Matter, 1990
- Twin formation and structural modulations in orthorhombic and tetragonal YBa2(Cu1-xCox)3O7-δPhilosophical Magazine Letters, 1989
- Solitons of the square-rectangular martensitic transformationPhysical Review B, 1985
- Tricritical phase transitions in ferroelectricsPhysica B+C, 1983
- Acoustic phonon instabilities and structural phase transitionsPhysical Review B, 1976
- The Use of Dislocation Theory in MagnetoelasticityJournal of Applied Physics, 1972