Phase Transitions in Nanoscale Ferroelectric Structures

MRS Bulletin ◽  
2009 ◽  
Vol 34 (11) ◽  
pp. 832-837 ◽  
Author(s):  
S.K. Streiffer ◽  
D.D. Fong
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Ferroelectric Phase Transition ◽  
Recent Progress ◽  
Ferroelectric Phase ◽  
Model Systems ◽  
Materials Processing ◽  
Phase Transition Behavior ◽  
Great Progress ◽  
The Common

AbstractOver decades of effort, investigations of the intrinsic phase transition behavior of nanoscale ferroelectric structures have been greatly complicated by materials processing variations and by the common and uncontrolled occurrence of spacecharge, which interacts directly with the polarization and can obscure fundamental behavior. These challenges have largely been overcome, and great progress in understanding the details of this class of phase transitions has been made, largely based on advances in the growth of high-quality, epitaxial ferroelectric films and in the theory and simulation of ferroelectricity. Here we will discuss recent progress in understanding the ferroelectric phase transition in a particular class of model systems: nanoscale perovskite thin-film heterostructures. The outlook for ferroelectric technology based on these results is promising, and extensions to laterally confined nanostructures will be described.

scholarly journals The origin of the lattice thermal conductivity enhancement at the ferroelectric phase transition in GeTe

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Đorđe Dangić ◽  
Olle Hellman ◽  
Stephen Fahy ◽  
Ivana Savić
Keyword(s):  
Phase Transition ◽  
Thermal Conductivity ◽  
Phase Transitions ◽  
Thermoelectric Materials ◽  
Ferroelectric Phase Transition ◽  
Lattice Thermal Conductivity ◽  
Ferroelectric Phase ◽  
Structural Phase ◽  
High Symmetry ◽  
Structural Phase Transitions

AbstractThe proximity to structural phase transitions in IV-VI thermoelectric materials is one of the main reasons for their large phonon anharmonicity and intrinsically low lattice thermal conductivity κ. However, the κ of GeTe increases at the ferroelectric phase transition near 700 K. Using first-principles calculations with the temperature dependent effective potential method, we show that this rise in κ is the consequence of negative thermal expansion in the rhombohedral phase and increase in the phonon lifetimes in the high-symmetry phase. Strong anharmonicity near the phase transition induces non-Lorentzian shapes of the phonon power spectra. To account for these effects, we implement a method of calculating κ based on the Green-Kubo approach and find that the Boltzmann transport equation underestimates κ near the phase transition. Our findings elucidate the influence of structural phase transitions on κ and provide guidance for design of better thermoelectric materials.

Ferroelectric Phase Transition Investigated by Thermal Analysis and Raman Scattering in SrBi2Ta2O9 Nanoparticles

2007 ◽  
Vol 121-123 ◽  
pp. 843-846 ◽  
Author(s):  
Hua Ke ◽  
De Chang Jia ◽  
Wen Wang ◽  
Yu Zhou
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Particle Size ◽  
Phase Transitions ◽  
Size Effect ◽  
Raman Spectra ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Intermediate Phase ◽  
Transition Sequence

Thermal analysis and Raman spectra were carried out in SrBi2Ta2O9 (SBT) nanoparticles to investigate phase transitions. Two anomalies have been observed in temperature dependence of specific heat for SBT nanoparticles. Under the combination with Raman spectra, it indicates that there exists a new ferroelectric intermediate phase in the phase-transition sequence. So we can conclude that the phase-transition sequence in SBT nanoparticles should be ferroelectric-ferroelectric-paraelectric. Moreover, the size effect was discussed in consideration of inner compressive stress in nanoparticles for this special transition behavior. The calculated results show that the SBT nanoparticles keep the ferroelectricity until the particle size is decreased to 4.2 nm.

Dielectric and ferroelectric behavior of an incipient ferroelectric Sr(1−3x/2)CexTiO3 novel solid solution

RSC Advances ◽  
2016 ◽  
Vol 6 (94) ◽  
pp. 91679-91688 ◽  
Author(s):  
Burhan Ullah ◽  
Wen Lei ◽  
Xiao-Hong Wang ◽  
Gui-Fen Fan ◽  
Xiao-Chuan Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid Solution ◽  
Dielectric Properties ◽  
Phase Formation ◽  
Ferroelectric Phase Transition ◽  
Chemical Structure ◽  
Ferroelectric Phase ◽  
Phase Transition Behavior ◽  
Ferroelectric Behavior ◽  
Transition Behavior

Phase formation, chemical structure, microwave (MW) dielectric properties, and relaxor-to-ferroelectric phase transition behavior of a novel Sr(1−3x/2)CexTiO3 solid solution ceramic sintered in nitrogen have been investigated.

1D metal-oxalates H2DABCO[M(C2O4)2]·3H2O (M(ii): Co, Mg, Zn): phase transitions and magnetic, dielectric, and phonon properties

2020 ◽  
Vol 8 (18) ◽  
pp. 6254-6263 ◽  
Author(s):  
Katarzyna Pasińska ◽  
Aneta Ciupa ◽  
Adam Pikul ◽  
Anna Gągor ◽  
Adam Pietraszko ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Long Range ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Antiferromagnetic Ordering ◽  
Magnetic Dielectric ◽  
Phonon Properties

We report the first example of 1D multiferroic homometallic oxalate, which exhibits ferroelectric phase transition around 219 K and a long-range antiferromagnetic ordering below 4 K.

Effect of the change of electrostatic constraints on the phase transitions of some phenomenological models of ferroelectrics

1970 ◽  
Vol 48 (7) ◽  
pp. 847-851
Author(s):  
C. C. Huang ◽  
J. Grindlay
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Equation Of State ◽  
Phenomenological Models ◽  
Phase Diagrams ◽  
Ferroelectric Phase Transition ◽  
Parallel Plate ◽  
Ferroelectric Phase ◽  
Dielectric Slab ◽  
Plate Separation

The effects of changes of electrostatic constraints on the ferroelectric phase transition are described. The discussion is based on a system consisting of a parallel-plate condenser with a dielectric slab insert. The material of the slab is assumed to be a ferroelectric with an equation of state, in the direction normal to the plates, of the form E = A(θ − θ0)D + ξD3 + ζD5. As the plate separation of the condenser is changed, the nature of the phase transition may change. The results are presented in the form of phase diagrams.

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