Journal ArticleDOI
NMR evidence for the coexistence of order-disorder and displacive components in barium titanate.
TLDR
The results demonstrate the coexistence of a displacive and order-disorder component in the phase transition mechanism and tetragonal breaking of the cubic symmetry due to biased Ti motion between off-center sites in the paraelectric phase above T(c).Abstract:
A quadrupole coupling induced $^{\mathrm{47}}\mathrm{T}\mathrm{i}$ and $^{\mathrm{49}}\mathrm{T}\mathrm{i}$ satellite background which transforms into well-defined satellite lines below ${T}_{c}$ in the ferroelectric phase has been observed in the cubic phase of an ultrapure ${\mathrm{B}\mathrm{a}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$ single crystal. The results demonstrate the coexistence of a displacive and order-disorder component in the phase transition mechanism and tetragonal breaking of the cubic symmetry due to biased Ti motion between off-center sites in the paraelectric phase above ${T}_{c}$.read more
Citations
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Caloric materials near ferroic phase transitions
TL;DR: The resulting magnetocaloric, electrocaloric and mechanocaloric effects are compared here in terms of history, experimental method, performance and prospective cooling applications.
Journal ArticleDOI
Crystal structure and the paraelectric-to-ferroelectric phase transition of nanoscale BaTiO3.
Millicent B. Smith,Katharine Page,Theo Siegrist,Peter L. Redmond,Erich C. Walter,Ram Seshadri,Louis E. Brus,Michael L. Steigerwald +7 more
TL;DR: Although structural distortions are robust to changes in particle size, what is affected is the coherency of the distortions, which is decreased in the smaller particles, in contrast to the sharp transition that is found for the bulk sample.
Journal ArticleDOI
Pseudo-Jahn-teller effect--a two-state paradigm in formation, deformation, and transformation of molecular systems and solids.
Journal ArticleDOI
Local Structural Heterogeneity and Electromechanical Responses of Ferroelectrics: Learning from Relaxor Ferroelectrics
Journal ArticleDOI
Nano-optical imaging and spectroscopy of order, phases, and domains in complex solids
TL;DR: In this paper, a general concept for the combination of optical spectroscopy with scanning probe microscopy emerged, extending the spatial resolution of optical imaging far beyond the diffraction limit.
References
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Journal ArticleDOI
Crystal stability and the theory of ferroelectricity
TL;DR: In this article, it is shown that the parameters which determine the lattice vibrations of a diatomic ionic crystal may be chosen in such a way that the crystal will exhibit ferroelectric properties, and that anti-ferroelectric transitions may be regarded as the result of an instability of the crystal for a certain normal mode of vibration.
Journal ArticleDOI
The chain structure of BaTiO3 and KNbO3
R. Comes,M. Lambert,A. Guinier +2 more
TL;DR: Among the different phases of BaTiO 3 and KNbO 3, only the rhombohedral form is completely ordered as mentioned in this paper, while the orthorhombic, tetragonal and cubic phases are only partially ordered: the structure as determined by classical diffraction data is an average structure.
Journal ArticleDOI
Origin of Raman Scattering and Ferroelectricity in Oxidic Perovskites
R. Migoni,Heinz Bilz,D. Bauerle +2 more
TL;DR: In this article, the second-order Raman scattering and the temperature dependence of the ferroelectric soft mode in perovskites are explained quantitatively in terms of a nonlinear shell model by assuming an anisotropy in the oxygen polarizability.
Journal ArticleDOI
Electric-Field-Induced Raman Scattering in SrTi O 3 and KTa O 3
P. A. Fleury,J. M. Worlock +1 more
Journal ArticleDOI
Neutron-Scattering Study of Soft Modes in Cubic BaTi O 3
J. Harada,J. D. Axe,Gen Shirane +2 more
TL;DR: In this article, the soft optic phonons in the cubic phase of BaTi${O}}_{3} have been reinvestigated by the neutron-scattering technique, and the interference permits, for the first time, a determination of the phase as well as the amplitude of the dynamical structure factors of the phonons involved.