Fractal Clusters in Relaxor PLZT Ceramics: Evolution in Electric Field

Shur, V. Ya.; Lomakin, G. G.; Rumyantsev, E. L.; Beloglazov, S. S.; Pelegov, D. V.; Sternberg, A.; Krumins, A.

doi:10.1080/00150190490429196

Cited by 14 publications

(5 citation statements)

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“…The second reasons of using logarithmic scale is based on our experience in the characterization of self-similar objects (for example, surfaces 30 or clusters) 31 and self-organized processes (for example, domain wall motion in ferroelectrics). 32 The powder surface itself can be easily considered as fractal objects with scaling behavior.…”

Section: Xps Data Interpretation In Terms Of Coverage Efficiency Of Cmentioning

confidence: 99%

Efficiency Threshold of Carbon Layer Growth in Li₄Ti₅O₁₂/C Composites

Pelegov

Koshkina

Pryakhina

et al. 2018

J. Electrochem. Soc.

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The core-shell morphology study is crucial for composite materials, comprised of a low conductive core with a highly conductive thin carbon shell. The study analyzed carbon morphology evolution for the two series of Li 4 Ti 5 O 12 /C samples with carbon content increasing from 0.9 to 5.6 wt%. The conventional X-Ray Photoelectron Spectroscopy (XPS) study allowed us to conclude about the efficiency threshold of carbon layer growth over lithium titanate core for two carbon deposition methods-both sucrose and acetylene decompositions. Although the carbon layer thickness is increasing with carbon concentration growth in LTO/C composites, the efficiency of carbon coverage was shown to decrease with the threshold carbon concentrations about 1-2%. The chemical bonding analysis based on the same XPS data was used for C@LTO interface characterization. The proposed approach can be used for optimization of producing different composites with core-shell structure (carbon-based composites, materials with protective layers, and materials with gradient core-shell structure).

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Section: Xps Data Interpretation In Terms Of Coverage Efficiency Of Cmentioning

confidence: 99%

Efficiency Threshold of Carbon Layer Growth in Li₄Ti₅O₁₂/C Composites

Pelegov

Koshkina

Pryakhina

et al. 2018

J. Electrochem. Soc.

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“…It seems that the origin of AE in the electrostrictive PMN-PT ceramics does not change with the applied field level; thus, it is assumed to be originated from the internal stress caused by the electrostrictive deformation or microdomain/nanodomain growth/ dynamics. It is obvious The fractal dimensions in PLZT and PMN determined by light scattering experiments were reported as 1.7 and 2.4, respectively, by Shur et al [80] and Koreeda [81]. Note that Koreeda's result on PMN was obtained from an unpoled sample with microdomains, while Aburatani et al's data [77] from AE were from the PMN-PT under a large electric field applied condition (i.e., PNR growth process).…”

Section: B) Fractal Dimension In Acoustic Emissionmentioning

confidence: 96%

Electrostrictive and Piezoelectric Effects in Relaxor Ferroelectrics: Historical Background

Uchino

2022

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Electrostrictive effects in complex-perovskite "relaxor" ferroelectrics (FEs) exhibit superior performance in comparison with the simple-perovskite normal FEs, such as giant electrostriction in its paraelectric phase and high electromechanical coupling in its FE phase. As one of the discoverers, the author will deliver the historical background of these epoch-making phenomena and the development strategy of how we considered performance improvement. Though both discoveries were actually originated from a sort of "serendipity" (lucky & accidental occurrence!), some of the key factors have been embedded in the research base: 1) interrelation between complex perovskite structure and ferroelectricity; 2) anharmonicity in relaxor FEs; and 3) microdomain contribution in relaxor FEs. In the last part of this article, the author introduces a bit different "mesoscopic" approach, "fractal analysis of microdomain configuration" in conjunction with the "domain engineering" concept, to distinguish the electromechanical coupling among the normal and relaxor FEs for remaining the future research seeds.

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“…The fractal dimensions determined by acoustic emission (AE) in various normal and relaxor ferroelectrics are summarized in Table 4. [38] ; # Reference [39] Though we do not have suitable theoretical tools/models at present to correlate the permittivity exponent γ and fractal dimension D, it is noteworthy that the systematic γ and D value change with phase transition diffuseness indicates a strong relationship. With promoting the domain size growth (from micro to macro) with temperature decrease and/or with external electric field increase, γ decreases from 2 to 1 and D increases from 2 to 3 (mono-domain state).…”

Section: Fractal Dimension In Ferroelectricsmentioning

confidence: 99%

“…Schuh et al analyzed the change on time in longitudinal elastic scattering of monochromatic light (λ = 0.63 μm) under unipolar rectangular electric field pulses (duration ranging from 1 ms to 10 s) [38] . It was shown that under application of pulse series the time dependence of light intensity I(t) scattered at a fixed angle ϕ is reproducible in details.…”

Section: Light Scattering Intensity and Fractal Dimensionmentioning

confidence: 99%