scholarly journals Relaxor Ferroelectric Oxides: Concept to Applications

2021 ◽  
Author(s):  
Lagen Kumar Pradhan ◽  
Manoranjan Kar
Keyword(s):  
Long Range ◽  
Ferroelectric Properties ◽  
Functional Materials ◽  
Ferroelectric Ceramic ◽  
Relaxor Ferroelectric ◽  
Device Applications ◽  
Electric Dipoles ◽  
Long Range Ordering ◽  
External Stimuli ◽  
Ferroelectric Oxides

Ferroelectric ceramic is one of the most important functional materials, which has great importance in modern technologies. A ferroelectric ceramic simultaneously exhibits dielectric, piezoelectric, ferroelectric, and pyroelectric properties. The inherent ferroelectric properties are directly related to long-range electric dipoles arrangement in the ferroelectric domains and its response to external stimuli. However, the interruption of the long-range ordering of dipoles leads to the formation of a special class of material is known as relaxor ferroelectric. It shows quite different physical properties as compared to ferroelectric (normal ferroelectric). The origin and design of relaxor ferroelectric are quite interesting for fundamental perspective along with device applications. Therefore, the origin of relaxor ferroelectric along with its fundamental understanding for possible future applications, have been explained briefly in the present chapter.

scholarly journals Relaxor ferroelectric properties of 85PZN–15BT transparent ceramic at low temperatures

2013 ◽  
Vol 03 (03) ◽  
pp. 1350020
Author(s):  
Lizhu Huang ◽  
Wei Zhao ◽  
Wei Ruan ◽  
Heji Yang ◽  
Jiangtao Zeng ◽  
...  
Keyword(s):  
Electric Field ◽  
Long Range ◽  
Low Temperatures ◽  
Remanent Polarization ◽  
Polar Region ◽  
Ferroelectric Properties ◽  
Relaxor Ferroelectric ◽  
Relaxor Behavior ◽  
Rich Region ◽  
Field Dependent

Dielectric, hysteresis (P–E) loops and TSDC properties of transparent 85PZN–15BT ceramic over -150–150°C were investigated. The sample was found to exhibit a strong relaxor behavior and a relatively small remanent polarization. TSDC studies showed that there existed an electric field-dependent peak in the p versus T. Such interesting features were attributed to the electric field-induced transition and coexistence of polar nanoregion, long-range ordered polar region and nonpolarizable BZN-rich region.

scholarly journals Rationalizing and engineering Rashba spin-splitting in ferroelectric oxides

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Hania Djani ◽  
Andres Camilo Garcia-Castro ◽  
Wen-Yi Tong ◽  
Paolo Barone ◽  
Eric Bousquet ◽  
...  
Keyword(s):  
Ferroelectric Properties ◽  
Functional Materials ◽  
Spin Splitting ◽  
Spin Orbit ◽  
Band Engineering ◽  
New Class ◽  
Rashba Spin ◽  
Rashba Spin Splitting ◽  
Spin Decoherence ◽  
Ferroelectric Oxides

Abstract Ferroelectric Rashba semiconductors (FERSC), in which Rashba spin-splitting can be controlled and reversed by an electric field, have recently emerged as a new class of functional materials useful for spintronic applications. The development of concrete devices based on such materials is, however, still hampered by the lack of robust FERSC compounds. Here, we show that the coexistence of large spontaneous polarization and sizeable spin–orbit coupling is not sufficient to have strong Rashba effects and clarify why simple ferroelectric oxide perovskites with transition metal at the B-site are typically not suitable FERSC candidates. By rationalizing how this limitation can be by-passed through band engineering of the electronic structure in layered perovskites, we identify the Bi$${}_{2}$$ 2 WO$${}_{6}$$ 6 Aurivillius crystal as a robust ferroelectric with large and reversible Rashba spin-splitting, that can even be substantially doped without losing its ferroelectric properties. Importantly, we highlight that a unidirectional spin–orbit field arises in layered Bi$${}_{2}$$ 2 WO$${}_{6}$$ 6 , resulting in a protection against spin-decoherence.

Ferroelectric Properties of SBT doped with Pr

2004 ◽  
Vol 848 ◽  
Author(s):  
J. Mata ◽  
A. Durán ◽  
E. Martínez ◽  
J. M. Siqueiros ◽  
J. Heiras
Keyword(s):  
Long Range ◽  
Ferroelectric Properties ◽  
Ferroelectric Ceramic ◽  
Ferroelectric Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strong Pinning ◽  
Diffraction Patterns ◽  
Ferroelectric Hysteresis ◽  
Diffuse Phase

ABSTRACTThe Sr1-xPrxBi2Ta2O9 (SBT-Pr) ferroelectric ceramic doped with Praseodymium in the range of concentration between 0 and 0.20 was studied. X-ray diffraction patterns show that the Pr-ion substitutes the Sr-ion in the main structure (A21am space group) and, as a consequence of this substitution the unit cell decreases monotonically. Thermoelectric Analysis (ε vs T) and ferroelectric hysteresis measurements were performed. From the ε-T curves it was observed that the transition temperature depends almost linearly on Pr content. Broad phase transitions were also observed, a typical behavior of ferroelectric materials with diffuse phase transition (DPT). An increase in the diffuseness coefficient is obtained by increasing Pr content according to the Isupov model, due to the higher cationic disorder in the structure, resulting in the loss of the long-range ferroelectric ordering. The hysteresis loop indicates that the substitution of Sr2+ by Pr3+,4+ lowers the polarization due possible to strong pinning domain mechanisms that obstruct long range ferroelectric ordering.

CRITICAL STRESS-INDUCED RELAXATION IN RELATION TO LONG-RANGE ORDERING, IN Au3Cu, AND SELF-INDUCED ORDERING, IN AuNi SOLID SOLUTIONS

1987 ◽  
Vol 48 (C8) ◽  
pp. C8-519-C8-524
Author(s):  
G. RENAUD ◽  
M. BELAKHOVSKY ◽  
J. HILLAIRET ◽  
M. WUTTIG ◽  
G. BESSENAY ◽  
...  
Keyword(s):  
Long Range ◽  
Solid Solutions ◽  
Critical Stress ◽  
Long Range Ordering

scholarly journals Mobile and immobile boundaries in ferroelectric films

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
P. Yudin ◽  
K. Shapovalov ◽  
T. Sluka ◽  
J. Peräntie ◽  
H. Jantunen ◽  
...  
Keyword(s):  
Long Range ◽  
Domain Walls ◽  
Ferroelectric Properties ◽  
Practical Importance ◽  
Dynamic Responses ◽  
Ferroelectric Films ◽  
Domain Structures ◽  
Mobile Interfaces ◽  
Ferroelastic Domains ◽  
Viable Method

AbstractThe intrinsic mobile interfaces in ferroelectrics—the domain walls can drive and enhance diverse ferroelectric properties, essential for modern applications. Control over the motion of domain walls is of high practical importance. Here we analyse theoretically and show experimentally epitaxial ferroelectric films, where mobile domain walls coexist and interact with immobile growth-induced interfaces—columnar boundaries. Whereas these boundaries do not disturb the long-range crystal order, they affect the behaviour of domain walls in a peculiar selective manner. The columnar boundaries substantially modify the behaviour of non-ferroelastic domains walls, but have negligible impact on the ferroelastic ones. The results suggest that introduction of immobile boundaries into ferroelectric films is a viable method to modify domain structures and dynamic responses at nano-scale that may serve to functionalization of a broader range of ferroelectric films where columnar boundaries naturally appear as a result of the 3D growth.

Magnetic ordering in relaxor ferroelectric (1 − x)Pb(Fe2/3W1/3)O3–xPbTiO3 single crystals

2007 ◽  
Vol 22 (8) ◽  
pp. 2116-2124 ◽  
Author(s):  
Li Feng ◽  
Haiyan Guo ◽  
Zuo-Guang Ye
Keyword(s):  
Single Crystals ◽  
Magnetic Measurements ◽  
Ferroelectric Properties ◽  
Magnetic Ordering ◽  
Magnetic Behavior ◽  
Relaxor Ferroelectric ◽  
X Ray Diffraction ◽  
Ferroelectric State ◽  
Temperature Changes ◽  
Temperature Solution

Single crystals of the perovskite solid solution (1 − x)Pb(Fe2/3W1/3)O3–xPbTiO3, with x = 0, 0.07, 0.27, and 0.75, have been synthesized by the high-temperature solution growth using PbO as flux and characterized by x-ray diffraction and dielectric and magnetic measurements. The crystal structure at room temperature changes from a pseudocubic to a tetragonal phase with the PbTiO3 (PT) content increasing to x ⩾ 0.27. As the amount of PT increases, the relaxor ferroelectric behavior of Pb(Fe2/3W1/3)O3 (PFW) is transformed toward a normal ferroelectric state with sharp and nondispersive peaks of dielectric permittivity at TC. Two types of magnetic orderings are observed on the temperature dependence of the magnetization in the crystals with x ⩽ 0.27. This behavior is explained based on the relationships among the magnetic ordering, perovskite structure, composition, and relaxor ferroelectric properties. Furthermore, the macroscopic magnetization of the system was measured under the application of a magnetic field, which demonstrates different magnetic behavior associated with the weakly ferromagnetic, antiferromagnetic, and paramagnetic ordering in the temperature range of 2 to 390 K. Interestingly, the low-temperature ferromagnetism is enhanced by the addition of ferroelectric PT up to x = 0.27.

Relationship between low-Q peak and long-range ordering of ionic liquids revealed by high-energy X-ray total scattering

2015 ◽  
Vol 17 (27) ◽  
pp. 17838-17843 ◽  
Author(s):  
Kenta Fujii ◽  
Shinji Kohara ◽  
Yasuhiro Umebayashi
Keyword(s):  
Ionic Liquids ◽  
Long Range ◽  
High Energy ◽  
Real Space ◽  
Space Structure ◽  
Total Scattering ◽  
X Ray ◽  
Peak Intensity ◽  
Long Range Ordering

A new function, SQpeak(r); a connection between low-Q peak intensity with real space structure.

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