Size effects of 109° domain walls in rhombohedral barium titanate single crystals—A molecular statics analysis

2016 ◽  
Vol 119 (2) ◽  
pp. 024105 ◽  
Author(s):  
Florian Endres ◽  
Paul Steinmann
Keyword(s):  
Barium Titanate ◽  
Single Crystals ◽  
Size Effects ◽  
Domain Walls ◽  
Molecular Statics

scholarly journals Effect of mechanical stresses on the domain structure of barium titanate single crystals

2020 ◽  
Vol 8 (4) ◽  
pp. 66-78
Author(s):  
V. V. Borodina ◽  
S. O. Kramarov
Keyword(s):  
Barium Titanate ◽  
Single Crystals ◽  
Domain Structure ◽  
Oxygen Vacancies ◽  
Domain Walls ◽  
Domain Switching ◽  
Mechanical Load ◽  
Ferroelectric Properties ◽  
Mechanical Stresses ◽  
The Impact

This review article summarizes the material of years of research on the impact of mechanical stresses on the domain structure of multiaxhetoelectrics using the example of barium titanium monocrystals. Since the discovery of the ferroelectric properties of barium titanate in 1944, this material has been the subject of comprehensive investigation as the first practically important and perhaps the most famous ferroelectric. The domain structure of barium titanate is sensitive to mechanical stresses arising both from simple uniaxial compression and from point impacts by local mechanical loading. Mechanical stress applied to a ferroelectric crystal may have a significant effect on dielectric and piezoelectric properties. In particular, 90-degree domain switching is possible under the influence of stresses. The most interesting experimental results are obtained in the study of elastoplastic processes in BaTiO 3 originating from local mechanical stresses. The following features are found and studied: development of strained region around the point of application of the load; “internal” 90-degree domain that does not extend to the crystal surfaces and does not close upon other domains; the growth of 90-degree domains under the influence of residual mechanical stresses; growth of cracks along charged 90-degree domain walls. The notions of “ferroplastic effect” (crystal deformation due to the formation of 90-degree ferroelectric domains) and “ferromechanical effect” (crack formation and growth along charged 90-degree domain walls) are introduced. The hypothesis of a significant role of oxygen vacancies in the processes of 90-degree domain reorientation was put forward and experimentally confirmed. In particular, an increase in the concentration of oxygen vacancies by reducing annealing of barium titanate single crystals creates more favorable conditions for the appearance of an "internal" 90-degree domain under local mechanical load. The study of the mechanisms governing the formation of a domain structure in ferroelectric crystals remains an important problem of modern materials science.

Conducting Domain Walls in Lithium Niobate Single Crystals

2012 ◽  
Vol 22 (18) ◽  
pp. 3936-3944 ◽  
Author(s):  
Mathias Schröder ◽  
Alexander Haußmann ◽  
Andreas Thiessen ◽  
Elisabeth Soergel ◽  
Theo Woike ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Single Crystals ◽  
Domain Walls

Grain-Size Effects on Diffuse Phase Transitions of Batio3 Ceramics Obtained by Alkoxide Precursors

1994 ◽  
Vol 346 ◽  
Author(s):  
R. P. S. M. Lobo ◽  
R. L. Moreira ◽  
N. D. S. Mohallem
Keyword(s):  
Grain Size ◽  
Phase Transitions ◽  
Barium Titanate ◽  
Size Effects ◽  
Sol Gel ◽  
Simple Relationship ◽  
Titanate Ceramics ◽  
Charged Defects ◽  
Alkoxide Precursors ◽  
Diffuse Phase

ABSTRACTBarium titanate ceramics have been obtained by sol-gel methods. The dielectric investigations of these materials revealed the existence of diffuse ferroelectric transitions. By using a phenomenological model, we could demonstrate the existence of a simple relationship between the diffuse character of the transition and the sample grain-size. This effect has been attributed to interactions between charged defects on the grain surfaces and the spontaneous polarization of the material.

X-ray photoelectron spectroscopy characterization of barium titanate ceramics prepared by the citric route. Residual carbon study

1997 ◽  
Vol 12 (9) ◽  
pp. 2388-2392 ◽  
Author(s):  
C. Miot ◽  
E. Husson ◽  
C. Proust ◽  
R. Erre ◽  
J. P. Coutures
Keyword(s):  
Barium Titanate ◽  
Single Crystals ◽  
Photoelectron Spectroscopy ◽  
Residual Carbon ◽  
Ion Etching ◽  
Xps Spectra ◽  
X Ray ◽  
Titanate Ceramics

Powder and ceramics of barium titanate prepared by the citric process were studied by x-ray photoelectron spectroscopy (XPS). Spectra of C1s, O1s, Ti2p, Ba3d, and Ba4d levels are analyzed in powder and ceramics immediately after the sintering step and after several months of exposure in the air. Ar-ion etching allowed one to characterize the material intrinsic carbon. The results are discussed in comparison with works previously published on oxide single crystals.

scholarly journals Domain Walls Motions in Barium Titanate Ceramics

1996 ◽  
Vol 06 (C8) ◽  
pp. C8-647-C8-650 ◽  
Author(s):  
B. L. Cheng ◽  
M. Gabbay ◽  
M. Maglione ◽  
Y. Jorand ◽  
G. Fantozzi
Keyword(s):  
Barium Titanate ◽  
Domain Walls ◽  
Titanate Ceramics
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