A5071370974- Ferroelectric and Piezoelectric Materials
- Shape Memory Alloy Transformations
- Multiferroics and related materials
- Acoustic Wave Resonator Technologies
- Metallic Glasses and Amorphous Alloys
- Titanium Alloys Microstructure and Properties
- Microwave Dielectric Ceramics Synthesis
- Magnetic Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Dielectric materials and actuators
- Intermetallics and Advanced Alloy Properties
- High-pressure geophysics and materials
- Magnetic properties of thin films
- Metal and Thin Film Mechanics
- Magnetic Properties of Alloys
- Heat Transfer and Optimization
- Bone Tissue Engineering Materials
- Material Dynamics and Properties
- Magnesium Alloys: Properties and Applications
- Microstructure and Mechanical Properties of Steels
- Material Properties and Applications
- Hydrogen Storage and Materials
- Adhesion, Friction, and Surface Interactions
- Graphite, nuclear technology, radiation studies
- Quasicrystal Structures and Properties
Xi'an Jiaotong University
2015-2025
Inner Mongolia University of Science and Technology
2024
Physical Sciences (United States)
2024
State Key Laboratory of Electrical Insulation and Power Equipment
2014
National Institute for Materials Science
2011-2013
In ferroelectric and relaxor-ferroelectric materials, piezoelectric dielectric properties are significantly enhanced at the morphotropic phase boundary (MPB), a between different phases with macroscopic symmetries. By contrast, in relaxor systems, such an MPB does not exist because relaxors of compositions possess same symmetry. Here, we report existence (MRB) single region ${\mathrm{K}}_{0.5}{\mathrm{Na}}_{0.5}{\mathrm{NbO}}_{3}\text{\ensuremath{-}}x{\mathrm{BaTiO}}_{3}$ system, which is...
Cluster-spin glass and ferroelectric relaxors have been observed in defect-containing ferromagnetic systems systems, respectively. However, it is unclear whether or not an analogous state exists the physically parallel ferroelastic (or martensitic) systems. In 1990s, theoretical studies suggested that premartensitic tweed could be viewed as a strain glass. there has no experimental verification of this hypothesis. paper, we provide test hypothesis by measuring possible signatures two...
A frozen short-range, strain-ordered state has been observed in several doped ferroelastic/martensitic alloys. The reported strain glass behavior attributed to atomic-scale point defects such as dopant atoms. We report here how nanoscale precipitates can also lead glassy behavior. Nanosized, randomly distributed Ti${}_{3}$Ni${}_{4}$-like precipitates, produced by aging/annealing at 473 K for 3 h, prohibit the B2 \ensuremath{\rightarrow} B19\ensuremath{'} martensitic transition that occurs a...
We report that $R$ martensite isothermally forms with time in a solution-treated ${\mathrm{Ti}}_{48.7}{\mathrm{Ni}}_{51.3}$ single crystal. This abnormal formation originates from the growth of short-range ordered phase time, i.e., ``crystallization'' strain glass. The established time-composition-temperature Ti-Ni diagram shows evolution and composition-temperature diagram. presence or absence this new diagram, as well other conditions (like doping Fe aging), is explained unified framework...
We report a strain glass state (B19\ensuremath{'} glass) in Ni-rich TiNi shape memory alloy produced by cold rolling. As compared to previously reported glasses, this has outstanding properties including quasilinear superelasticity with large recoverable (\ensuremath{\sim}4%), and slim hysteresis high strength (\ensuremath{\sim}1.0 GPa) over wide temperature range (\ensuremath{\sim}200 K). The existence of the B19\ensuremath{'} is confirmed (i) frequency dispersion storage modulus, (ii)...
Development of miniaturized magnetostriction-associated devices requires low-field-triggered large magnetostriction. In this study, we acquired a magnetostriction (800 ppm) triggered by low saturation field (0.8 kOe) in iron-palladium (Fe-Pd) alloys. Magnetostriction enhancement jumping from 340 to 800 ppm was obtained with slight increase Pd concentration 31.3 32.3 at. %. Further analysis showed that such led suppression the long-range ordered martensitic phase and resulted frozen...
Strain glass is a new strain state discovered recently in ferroelastic systems that characterized by nanoscale martensitic domains formed through freezing transition. These nanodomains typically have mottled or tweed morphology depending on the elastic anisotropy of system. transition broadly smeared and high order–like transition, taking place within wide temperature stress range. It accompanied many unique properties, including linear superelasticity with strength, low modulus, Invar...
Mgx(Ni0.8La0.2)100-x, where x = 60, 70, 80, exhibiting a nanocrystalline microstructure, were prepared through the crystallization of amorphous alloys. The investigation encompassed phase constitution, grain size, microstructural stability, and hydrogen storage properties. Crystallization kinetics, along with in-situ high-energy XRD characterization, revealed concentrated synchronous Mg2Ni RE-Mg-Ni ternary phases increase in La Ni content. attributed process was found to be result close...
Glass transition has often been considered as a purely kinetics-controlled freezing process, thus it is not expected that frozen glass state can spontaneously transform into long-range-ordered (LRO) phase. Here we show evidence for spontaneous from strain (STG) to LRO martensite in Ti${}_{50}$Ni${}_{44.5}$Fe${}_{5.5}$ alloy: the alloy freezes STG at 179 K, but does keep and transforms ($R$ phase) 154 K. The (with local $R$-like order) $R$ phase explained by considering existence of...
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 currently promising candidates confronted with a critical challenge: intrinsic incompatibility among broad temperature window, low hysteresis, high strain. Here we report re-entrant relaxor–ferroelectric composite that solves long-standing hysteresis electrostrain over range (i.e., 168-K...
The morphotropic phase boundary (MPB) has been utilized extensively in ferroelectrics and recently attracted interest ferromagnets [S. Yang, H. Bao, C. Zhou, Y. Wang, X. Ren, Matsushita, Katsuya, M. Tanaka, K. Kobayashi, Song, J. Gao, Phys. Rev. Lett. 104, 197201 (2010); R. Bergstrom, Wuttig, Cullen, P. Zavalij, Briber, Dennis, V. O. Garlea, Laver, 111, 017203 (2013)] for obtaining enhanced large field-induced strain. Here we report that the MPB can also lead to weakening (the inverse effect...
Abstract Piezoelectric materials with a high piezoelectric coefficient ( d 33 ) and mechanical quality factor Q m are vital for advanced high‐power applications. However, achieving this combination is challenging, particularly lead‐free piezoelectrics, because value relies on mobile domain walls, which increase dissipative losses reduce . In study, longstanding trade‐off overcome by introducing defect dipoles (via Mn doping) into the quadruple point (QP) composition of Ba(Sn, Ti)O 3 system....
Abstract Ferroic glasses (strain glass, relaxor and cluster spin glass) refer to frozen disordered states in ferroic systems; they are conjugate the long-range ordered states—the crystals. exhibit unusual properties that absent crystals, such as slim hysteresis gradual property changes over a wide temperature range. In addition third state, glass-ferroic (i.e., composite of glass crystal), can be produced by crystallization transition glasses. It have superior not possessed its two...
Obtaining superior physical properties for ferroic materials by manipulating the phase transitions is a key concern in solid state physics. Here, we investigated dielectric permittivity, piezoelectric coefficient d33, storage modulus, and crystal symmetry of (1-x)Ba(Ti0.8Zr0.2)O3-x(Ba1−yCay)TiO3 (BZT-xBCyT) systems to demonstrate gradual evolution process from successive BaTiO3 morphotropic boundary (MPB) regime BZT-xBC0.3T. Furthermore, analysed with Landau-type theoretical model show that...