Ferroelastic phase transitions and domain structures in powders
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Hans Boysen
Abstract
Powder patterns of samples resulting from ferroelastic phase transitions generally show typical line profiles: asymmetry into the direction of the position of the corresponding hypothetical high symmetry reflection and strongly anisotropic line broadening. An approximate model is presented that describes the characteristic distribution of individual line widths based on the variation of lattice spacings within the domain walls. The variation with temperature is governed by the competition of decreasing spontaneous strain and increasing wall widths and/or wall densities. It is argued that conventional Rietveld refinements can easily lead to erroneous results and a simplified method is proposed to approximate the actual line profiles via the introduction of a second phase with anisotropic strain broadening to take into account the scattering fom the domain walls.
© by Oldenbourg Wissenschaftsverlag, München
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- Surface relaxations at mineral surfaces
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- Phase transitions in BaTiO3: a high-pressure neutron diffraction study
- Nanoscale phase transformations in relaxor-ferroelectric lead scandium tantalate and lead scandium niobate
- On the nanostructure of radiation-amorphized zircon and pyrochlores: a small-angle x-ray scattering study
Articles in the same Issue
- Phase Transitions
- Structural phase transitions in two-dimensional systems: Pb/Ge(111) and Sn/Ge(111)
- Theoretical approach to reconstructive and morphotropic phase transitions
- Surface relaxations at mineral surfaces
- Methods for pseudosymmetry evaluation: a comparison between the atomic displacements and electron density approaches
- Revised prediction of B1 to B2 phase transition pressures in YbN, YbP and YbAs
- Crossover from classical to 3d-Ising critical behaviour near the antiferrodistortive phase transition of lawsonite
- CaZrGeO5 and the triclinic instability of the titanite structure type
- The high-pressure structural phase transitions of sodium bismuth titanate
- Ferroelastic phase transitions and domain structures in powders
- Phase transitions in BaTiO3: a high-pressure neutron diffraction study
- Nanoscale phase transformations in relaxor-ferroelectric lead scandium tantalate and lead scandium niobate
- On the nanostructure of radiation-amorphized zircon and pyrochlores: a small-angle x-ray scattering study
