Investigation of the structure of ferroelectric domain boundaries by transmission electron microscopy

1976 ◽  
Vol 47 (12) ◽  
pp. 5195-5200 ◽  
Author(s):  
T. Malis ◽  
H. Gleiter
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ferroelectric Domain ◽  
Transmission Electron ◽  
Domain Boundaries

Features of the ferroelectric domain structure in the multiferroic material YbMnO3

MRS Advances ◽  
2016 ◽  
Vol 1 (9) ◽  
pp. 591-596
Author(s):  
Takumi Inoshita ◽  
Yasuhide Inoue ◽  
Yoichi Horibe ◽  
Yasumasa Koyama
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Domain Structure ◽  
Ferroelectric Domain ◽  
Multiferroic Material ◽  
Ferroelectric State ◽  
Hexagonal Axis ◽  
Domain Structures ◽  
Transmission Electron ◽  
Domain Boundaries

ABSTRACTThe multiferroic material YbMnO3 has been reported to exhibit both ferroelectric and antiferromagnetic orders in the ground state. Of these two orders, the ferroelectric order is associated with the P63/mmc-to-P63cm structural transition, which occurs around 1270 K. The interesting feature of the ferroelectric state is that a cloverleaf domain structure with a pseudo-six-fold symmetry is observed in transmission electron microscopy images with the beam incidence parallel to the hexagonal axis. To understand the origin of the formation of the cloverleaf domain structure, we have examined the crystallographic features of the ferroelectric state in YbMnO3 by transmission electron microscopy. In this study, particularly, we adopted the experimental condition that electron beam incidences are perpendicular to the hexagonal axis. It was, as a result, found that there existed various ferroelectric domain structures including the cloverleaf domain structure under the present condition. The notable feature of domain structures found in this study is that each domain structure basically consists of six domains, whose domain boundaries are terminated at one point. Because this feature makes us reminiscent of a discommensurate structure in an incommensurate state, we took high-resolution electron micrographs of areas including domain boundaries. Their analysis indicated that a domain boundary could be identified as a discommensuration with a phase slip of π/3. It is thus understood that the cloverleaf domain structure should be one of domain morphologies for a discommensurate structure, which is related to the break of the translational symmetry.

Ferroelectric Domain Boundaries Induced by Interface Mismatch Dislocations in BaTiO3/LaAlO3

1996 ◽  
Vol 466 ◽  
Author(s):  
Z. L. Wang ◽  
Z. R. Dai
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Ferroelectric Domain ◽  
Organic Chemical ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition

ABSTRACTInterface microstractures of BaTiO3/LaAlO3 grown by metal-organic chemical vapor deposition (MOCVD) are studied using high-resolution transmission electron microscopy (HRTEM). Interface dislocations in BaTiO3/LaAlO3 have been shown to be directly linked with the 90° domain boundaries in BaTiO3. This association is a result of strain relief due to a phase transformation on cooling from the growth temperature. The {100} surfaces of BaTiO3 are terminated with the Ba-O layer.

Nucleation of Disorder in Fe3Al Alloys

1967 ◽  
Vol 25 ◽  
pp. 312-313
Author(s):  
P. R. Swann ◽  
W. R. Duff ◽  
R. M. Fisher
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Annealing Temperature ◽  
Antiphase Domain ◽  
Effect Of Temperature ◽  
Domain Structures ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Higher Temperature ◽  
The One

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

Multiple twinning of diamond synthesized by acetylene flame

2004 ◽  
Vol 219 (8) ◽  
Author(s):  
Sam Ick Son ◽  
Su Jin Chung
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Electron Back Scatter Diffraction ◽  
The Other ◽  
Hrtem Image ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Multiple Twinning ◽  
Ebsd Method

AbstractThe relation between the domains and domain boundaries of multiple twins of diamond were investigated by the electron back scatter diffraction (EBSD) method and high resolution transmission electron microscopy (HRTEM). Multiple twinned diamonds have two types of icosahedral morphologies. One is an almost perfect icosahedron in which all of the faces are {111} faces. The other is a hollow icosahedron similar to one of the Kepler-Poinsot polyhedrons. The indented negative trigonal faces are formed from the {100} faces of a cube. It was confirmed that the convex edges of the twinned icosahedron corresponded to the Σ3 boundaries, whereas the concave edges were assigned to the Σ9 twin boundary by means of the EBSD analysis.It was confirmed from the HRTEM image that a series of dislocations compensate for the mismatching angle which occurs after five successive twinning.

Observation of antiphase domain boundaries in GaAs on silicon by transmission electron microscopy

1988 ◽  
Vol 53 (13) ◽  
pp. 1207-1209 ◽  
Author(s):  
J. B. Posthill ◽  
J. C. L. Tarn ◽  
K. Das ◽  
T. P. Humphreys ◽  
N. R. Parikh
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Antiphase Domain ◽  
Transmission Electron ◽  
Domain Boundaries

Microstructure of La1–xCaxMnO3 studied by transmission electron microscopy

2001 ◽  
Vol 16 (10) ◽  
pp. 2959-2965 ◽  
Author(s):  
Q. Chen ◽  
J. Tao ◽  
J. J. Zuo ◽  
J. J. H. Spence
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Colossal Magnetoresistance ◽  
Displacement Vector ◽  
Orthorhombic Unit Cell ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Synthesis Routes ◽  
Colossal Magnetoresistance Effect ◽  
The Ideal

Microstructures of La1-xCaxMnO3 compounds (x = ⅓ and 0.5) prepared with and without intermediate grinding were studied using transmission electron microscopy. A high density of antiphase boundaries (APBs) with displacement vector 1/2 〈111〉, indexed in orthorhombic unit cell, has been observed in bulk samples with no or minimum intermediate grinding. The nature of this APB is analyzed and found to bedue to the symmetry breaking introduced by the tilting of MnO6 octahedra relative to the ideal perovskite structure. Samples prepared using two intermediate grinds do not show these defects indicating that the microstructure can be controlled through synthesis routes. The effect of domain boundaries on the colossal magnetoresistance effect is discussed.

Ferroelectric Domain Structures and Piezoelectric Properties of Pb(Zr,Ti)O3 Ceramics

2011 ◽  
Vol 485 ◽  
pp. 3-6
Author(s):  
Naoki Iwaji ◽  
Chiharu Sakaki ◽  
Nobuyuki Wada ◽  
Hiroshi Takagi ◽  
Shigeo Mori
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Phase Boundary ◽  
Piezoelectric Properties ◽  
Ferroelectric Domain ◽  
Strongly Correlated ◽  
Grain Composition ◽  
Pzt Ceramics ◽  
Domain Structures ◽  
Transmission Electron

We investigated domain structures in Pb(Zr,Ti)O3(PZT) ceramics whose composition lies on the morphotropic phase boundary (MPB) using transmission electron microscopy (TEM) and evaluated the piezoelectric properties of PZT. We found that monoclinic nanosized domains (nanodomains), which form in tetragonal domains, strongly correlated with the piezoelectric properties of PZT. The degree of formation of nanodomains depends on the grain composition. Thus, controlling the homogeneity of grain composition in the ceramics is crucial for optimizing the piezoelectric properties of PZT.

scholarly journals Effect of screw threading dislocations and inverse domain boundaries in GaN on the shape of reciprocal-space maps

2017 ◽  
Vol 50 (2) ◽  
pp. 555-560 ◽  
Author(s):  
Mykhailo Barchuk ◽  
Mykhaylo Motylenko ◽  
Gleb Lukin ◽  
Olf Pätzold ◽  
David Rafaja
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Reciprocal Space ◽  
Threading Dislocations ◽  
X Ray Diffraction ◽  
Reciprocal Space Mapping ◽  
Vapour Phase Epitaxy ◽  
X Ray ◽  
Transmission Electron ◽  
Domain Boundaries

The microstructure of polar GaN layers, grown by upgraded high-temperature vapour phase epitaxy on [001]-oriented sapphire substrates, was studied by means of high-resolution X-ray diffraction and transmission electron microscopy. Systematic differences between reciprocal-space maps measured by X-ray diffraction and those which were simulated for different densities of threading dislocations revealed that threading dislocations are not the only microstructure defect in these GaN layers. Conventional dark-field transmission electron microscopy and convergent-beam electron diffraction detected vertical inversion domains as an additional microstructure feature. On a series of polar GaN layers with different proportions of threading dislocations and inversion domain boundaries, this contribution illustrates the capability and limitations of coplanar reciprocal-space mapping by X-ray diffraction to distinguish between these microstructure features.

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