Quantitative determination of the thickness of ferroelectric domain walls using weak beam transmission electron microscopy

1999 ◽  
Vol 75 (4) ◽  
pp. 203-213 ◽  
Author(s):  
M. Foeth ◽  
P. Stadelmann ◽  
P.-A. Buffat
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Quantitative Determination ◽  
Domain Walls ◽  
Ferroelectric Domain ◽  
Weak Beam ◽  
Transmission Electron ◽  
Beam Transmission

Critical Behavior of Antiphase Boundaries in Fe-A127% Close to the D03→B2 Order Phase Transition

1995 ◽  
Vol 398 ◽  
Author(s):  
D. Le Floc'h ◽  
A. Loiseau
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transmission Electron Microscopy ◽  
Quantitative Determination ◽  
Order Phase Transition ◽  
Critical Behavior ◽  
Antiphase Boundaries ◽  
Transmission Electron ◽  
Second Order Phase Transition

ABSTRACTIn this paper, we present the first quantitative determination of the divergence law of the correlation length ξ, when approaching the second order phase transition DO3→B2, by studying the behaviour of the APBs by transmission electron microscopy.

HREM study of ferroelectric domain wall in barium titanate

1994 ◽  
Vol 52 ◽  
pp. 566-567
Author(s):  
Laurent. Normand ◽  
Alain. Thorel ◽  
Yvan. Montardi
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Barium Titanate ◽  
Domain Walls ◽  
Ferroelectric Phase ◽  
Ferroelectric Domain ◽  
Transmission Electron ◽  
The One

This study focuses on High Resolution Transmission Electron Microscopy of barium titanate in its tetragonal ferroelectric phase, and especially on the structure of domain walls. This phase is stable between about 0 °C and 130 °C. During cooling, at 130 °C barium titanate changes from a cubic parraelectric phase to a tetragonal ferroelectric phase. In this phase the spontaneous polarisation is along one of the six [001] pseudo-cubic directions. Two types of domains can be formed during the phase transition :90° and 180° domains. In 90° domains the polarisation is at 90° from the polarisation of the next domain (exactly 2* ArcTan(a/c) if a and c are the lattice parameters). For these domains the domain walls are <110< type planes ; In 180° domains the polarisation is at 180° from the one in the next domain. 180° domain walls are <100< type plane and are assumed to be purely ferroelectric.

Characterization of superdislocation dissociations in Al66Ti25Cr9 with transmission electron microscopy observations and image simulations

1998 ◽  
Vol 13 (3) ◽  
pp. 610-624 ◽  
Author(s):  
Mukul Kumar ◽  
K. J. Hemker
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Displacement Fields ◽  
Superlattice Dislocation ◽  
Weak Beam ◽  
Transmission Electron ◽  
Beam Transmission ◽  
Simulated Images ◽  
Image Simulations

The nature of dissociated superlattice dislocation cores in Al66Ti25Cr9, deformed at room temperature, has been characterized by weak-beam transmission electron microscopy (TEM) and comparison of experimental images with computer-simulated images. The displacement fields associated with narrowly dissociated APB- and SISF-dissociated ‹110› superdislocations were calculated to account for the asymmetry in dislocation contrast and led to a better understanding of the formation of images. Such calculations are a powerful aid, when coupled with image simulations, in distinguishing the “real” intensity peaks from the supplementary peaks that can be generated under experimental imaging conditions. While both APB- and SISF-dissociated superdislocations were identified, the vast majority of superdislocations were determined to be APB-dissociated. Corrected values of the fault energies (γAPB and γSISF ) have been measured for this alloy. These energies and the observed dissociations are shown to be self-consistent.

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