Glass-ferroic composite caused by the crystallization of ferroic glass

Ji, Yuanchao; Ding, Xiangdong; Wang, Dong; Otsuka, Kazuhiro; Ren, Xiaobing

doi:10.1103/physrevb.92.241114

Cited by 14 publications

(11 citation statements)

References 23 publications

(61 reference statements)

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“…Interestingly, a similar relaxor-ferroelectric coexisting microstructure has also been found around the spontaneous/crystallization transition temperature of the relaxor [30][31][32] , but upon cooling, a very large hysteresis comparable to that of the ferroelectric is inevitable (e.g., PMN, BNT-based materials in Fig. 1b) 9,10,18 since the volume fraction of the ferroelectric domains becomes larger and larger.…”

Section: Thermal-stable Electrostrain Properties Originating From Thesupporting

confidence: 54%

Re-entrant relaxor–ferroelectric composite showing exceptional electromechanical properties

Fang

Zhang

et al. 2018

NPG Asia Mater

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Thermal stability, precision, and large output are desired for applications of electromechanical materials. However, this combination has been hardly attained because both the commercially used materials and currently promising candidates are confronted with a critical challenge: the intrinsic incompatibility among the broad temperature window, low hysteresis, and high strain. Here we report a re-entrant relaxor-ferroelectric composite that solves this long-standing challenge: a combination of low hysteresis and large electrostrain over a broad temperature range (i.e., a 168-K temperature window for hysteresis <20% and strain >0.1%) in sufficiently disordered (Ba 0.925 Bi 0.05)(Ti 1−x/100 Sn x/ 100)O 3 ceramics. In situ transmission electron microscopic observations and permittivity measurements reveal the existence of a re-entrant anomaly that guarantees the relaxor-ferroelectric microstructure over a broad temperature range and the resulting combination of exceptional properties. Our finding of a re-entrant relaxor-ferroelectric composite not only solves the incompatibility of the electromechanical properties but may also open a way to develop thermally stable high-performance materials.

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Section: Thermal-stable Electrostrain Properties Originating From Thesupporting

confidence: 54%

Re-entrant relaxor–ferroelectric composite showing exceptional electromechanical properties

Fang

Zhang

et al. 2018

NPG Asia Mater

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“…Annealing at such a temperature not only fully annihilates the metastable B19' martensite produced in Step-1 processing, but also results in a unique "dual-crossover strain glass" (DC-STG) state. This DC-STG is an unfrozen R strain glass (R-STG) at room temperature and it undergoes a strain glass transition around T g ~251 K, which is evidenced by the same signatures as those of a normal strain glass transition reported in the literature [31][32][33] , including a frequency (w) dependent T g following Vogel-Fulcher law (inset of Fig. 2b) and the invariance of average B2 structure across T g , together with the appearance of nano-sized R strain domains.…”

Section: Unique Mechanical Properties Of Ds-stg Alloysupporting

confidence: 63%

A polymer-like ultrahigh-strength metal alloy

Ren,

Yang,

et al. 2024

Preprint

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Futuristic technologies like morphing aircrafts and superstrong artificial muscles are hinged on metal alloys being as strong as an ultrahigh-strength steel (with a high yield strength σy >1 GPa) yet as flexible as a polymer (with an ultralow elastic modulus E ~10 GPa)1-3. However, achieving such “strong yet flexible” alloys has proven challenging4-9. The difficulty lies in an inevitable trade-off between strength and flexibility5,8,10, which precludes a high-strength alloy from being of polymer-like ultralow modulus. Here we report a Ti-50.8 at.% Ni strain glass alloy showing an unprecedented combination of an ultrahigh yield strength σy ~1.8 GPa with a polymer-like ultralow elastic modulus E ~10.5 GPa, together with a superlarge rubber-like J-shaped elastic strain of ~8%. As a result, it possesses the highest flexibility figure of merit σy/E ~0.17 which far exceeds that of existing structural materials. This alloy was fabricated by a simple 3-step thermomechanical treatment, which leads to not only ultrahigh strength but also ultralow modulus through forming a unique “dual-seed strain glass” (DS-STG) microstructure, being a strain glass matrix embedded with a small amount of R and B19' martensites. In-situ x-ray diffractometry reveals that the DS-STG enables a nucleation-free reversible transition between strain glass and R and B19’ martensites during stress loading/unloading, thereby leading to ultralow modulus and large recoverable strain with narrow hysteresis. Our finding may open a new horizon for designing and mass-producing strong and flexible alloys and such alloys may lead to important applications.

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“…[ 34 ] The absence of some 1/7 spots in the FFT pattern in Figure 6b3 indicates that these precipitates have not yet developed well in the early stage of precipitation. [ 35 ] The inverse FFT images (Figure 6b4,c4) further confirm the existence of profuse residual dislocations in B2 matrix. The dislocation density in the Co6 alloy calculated by Williamson–Hall method is up to

2 .32 \times 10^{15} {normalm}^{- 2}

, [ 36 ] one order of magnitude higher than the well‐annealed Ti–Ni nanocrystalline alloys.…”

Section: Resultsmentioning

confidence: 73%

Nanostructured Ti–Ni–Co Alloys Showing Shape‐Memory Actuation of Large Work Output at Low Temperature

Dang,

Zhang,

Zhou

et al. 2023

Adv Eng Mater

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In the present study, by combining the effect of point defect doping and nanostructure, we developed low‐temperature Ti49.2Ni50.8−xCox shape memory alloys showing good actuation property. The doping of Co into Ti‐Ni host alloy suppresses the martensitic transformation to lower temperature. By post‐deformation annealing, the partially recrystallized state containing dense dislocations and nanoprecipitates is achieved. And this remarkably strengthens the matrix to avoid irreversible strain under large external load. A Ti49.2Ni44.8Co6 alloy thereby exhibits a recoverable actuation strain of 4.5% under biased tensile stress of 800 MPa at temperatures below −50∘C. The work output up to 36MJ/m3 outperforms most shape memory alloys, showing a promise for low‐temperature actuator applications.This article is protected by copyright. All rights reserved.

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Glass-ferroic composite caused by the crystallization of ferroic glass

Cited by 14 publications

References 23 publications

Re-entrant relaxor–ferroelectric composite showing exceptional electromechanical properties

Re-entrant relaxor–ferroelectric composite showing exceptional electromechanical properties

A polymer-like ultrahigh-strength metal alloy

Nanostructured Ti–Ni–Co Alloys Showing Shape‐Memory Actuation of Large Work Output at Low Temperature

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