The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform
Yoshiaki Uesu - One of the best experts on this subject based on the ideXlab platform.
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Ferroelasticity pseudoelasticity and shape memory effect in pb3 po4 2
Solid State Communications, 1992Co-Authors: Y Yamada, Yoshiaki UesuAbstract:Abstract We have found that ferroelastic Pb3(PO4)2 crystal exhibits pseudoelasticity and shape-memory effect which have been commonly observed in b.c.c. based alloys. Single crystals of Pb3(PO4)2 are observed to be deformed reversibly beyond ordinary elastic limit of ionic materials under the application of stress of specific type. The large deformation was found to be realized by the change in domain structure associated with the variants of the ferroelastic phase. Effective elastic constant (pseudoelastic constant) of Pb3(PO4)2 determined from the measurement of stress-strain curve of a bulk sample was found to be 10−3 times smaller than the intrinsic elastic constant of this material. By some aging treatment, the bistable state of domain structure was realized, which is interpreted to be a kind of two-way shape memory effect.
Y Yamada - One of the best experts on this subject based on the ideXlab platform.
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Ferroelasticity pseudoelasticity and shape memory effect in pb3 po4 2
Solid State Communications, 1992Co-Authors: Y Yamada, Yoshiaki UesuAbstract:Abstract We have found that ferroelastic Pb3(PO4)2 crystal exhibits pseudoelasticity and shape-memory effect which have been commonly observed in b.c.c. based alloys. Single crystals of Pb3(PO4)2 are observed to be deformed reversibly beyond ordinary elastic limit of ionic materials under the application of stress of specific type. The large deformation was found to be realized by the change in domain structure associated with the variants of the ferroelastic phase. Effective elastic constant (pseudoelastic constant) of Pb3(PO4)2 determined from the measurement of stress-strain curve of a bulk sample was found to be 10−3 times smaller than the intrinsic elastic constant of this material. By some aging treatment, the bistable state of domain structure was realized, which is interpreted to be a kind of two-way shape memory effect.
Michael J Reece - One of the best experts on this subject based on the ideXlab platform.
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dual Ferroelasticity of lanthanum chromium based multicomponent solid solution perovskite
Scripta Materialia, 2009Co-Authors: Nina Orlovskaya, M Lugovy, Dmytro Verbylo, Michael J ReeceAbstract:While the majority of mixed ionic electronic conducting ferroelastic perovskites exhibit a single softening followed by hardening during loading, we report an unusual dual softening in lanthanum chromite-based perovskite due to a possible pressure-induced first-order phase transition from orthorhombic to rhombohedral phase during loading. The effects of temperature and cyclic incremental loading on the deformation behavior of the material are studied.
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Ferroelasticity and hysteresis in lacoo3 based perovskites
Acta Materialia, 2002Co-Authors: Nina Orlovskaya, Yury Gogotsi, Michael J Reece, Bolin Cheng, Ion GibsonAbstract:Abstract Perovskite-type ABO3 (where A=La, Ca; B=Co) ceramics are very promising materials for oxygen separation membrane and solid oxide fuel cells applications. However, their mechanical behavior has not yet been adequately studied. We studied the mechanical performance of perovskite ceramics using a combination of microindentation, compression, and bending. Our work demonstrated ferroelastic hysteretic behavior during indentation and compression loading in LaCoO3 based perovskites. This behavior can be caused by domain reorientation and/or phase transformation. Domain switching under the compression loading in LaCoO3 based perovskites has been demonstrated by XRD. Nonlinearity during fracture toughness measurements was observed in the dense La0.8Ca0.2CoO3 perovskite. Such nonlinearity can be assigned to the domain switching or the phase transformation during crack propagation. This might be a reason of a higher fracture toughness of this material compared to non-ferroelastic composition.
Satoshi Takamizawa - One of the best experts on this subject based on the ideXlab platform.
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shape rememorization of an organosuperelastic crystal through superelasticity Ferroelasticity interconversion
Angewandte Chemie, 2019Co-Authors: Shunichi Sakamoto, Toshiyuki Sasaki, Ayana Satotomita, Satoshi TakamizawaAbstract:: As altering permanent shapes without loss of material function is of practical importance for material molding, especially for elastic materials, shape-rememorization ability would enhance the utility of elastic crystalline materials. Since diffusionless plastic deformability can preserve the crystallinity of materials, the interconversion of diffusionless mechanical deformability between superelasticity and Ferroelasticity could enable shape rememorization of superelastic single crystals. This study demonstrates the shape rememorization of an organosuperelastic single crystal of 1,4-dicyanobenzene through time-reversible interconversion of superelasticity-Ferroelasticity relaxation by holding the mechanically twinned crystal without heating. The shape-rememorization ability of the organosuperelastic crystal indicates the compatibility of superelasticity (antiFerroelasticity) and Ferroelasticity as well as the intrinsic workability of organic crystalline materials capable of recovering their crystal functions under mild conditions.
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twinning Ferroelasticity facilitated by the partial flipping of phenyl rings in single crystals of 4 4 dicarboxydiphenyl ether
Royal Society Open Science, 2018Co-Authors: Emile R Engel, Yuichi Takasaki, Satoshi TakamizawaAbstract:Evidence of Ferroelasticity in a non-planar organic molecular crystal is presented for 4,4′-dicarboxydiphenyl ether. Ferroelasticity has been demonstrated by the micro- and macroscopic mechanical characterization of single crystals, including recording of a full hysteretic stress–strain cycle. The underlying mechanism involves the partial flipping of phenyl rings.
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Ferroelasticity in an organic crystal a macroscopic and molecular level study
Angewandte Chemie, 2017Co-Authors: Yuichi Takasaki, Emile R Engel, Satoshi TakamizawaAbstract:Ferroelasticity has been relatively well studied in inorganic atomic solids with a mechanical robustness but the phenomenon has been poorly investigated in organic crystals with an inherent fragility because of the absence of precise methods of a mechanical measurement for the small crystals. Here we present the first example of Ferroelasticity in an organic molecular crystal of 5-chloro-2-nitroaniline with thorough characterizations by macro- and microscopic methods. An observed cyclic stress-strain curve satisfied requirements for the Ferroelasticity and the crystal structural analysis provided insight into a lattice correspondence at the twining interface enabling a drastic crystal bending through a large molecular orientational shift. This deformation derived the highest maximum strain (115.9 %) among reported twinning materials and the relatively high dissipated energy density (216 kJ m-3), which suggests a potential utility of this material as a mechanical damping agent.
Xiao Cheng Zeng - One of the best experts on this subject based on the ideXlab platform.
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phase transitions and Ferroelasticity multiferroicity in bulk and two dimensional silver and copper monohalides
arXiv: Materials Science, 2019Co-Authors: Menghao Wu, Xiao Cheng ZengAbstract:We show ab initio calculation evidence that silver and copper monohalides have relatively low transition barriers between the non-polar rock-salt phase and the polar zinc blende phase. Notably, the low transition barriers endow both monohalides with novel mechanical and electronic properties, i.e., coupled Ferroelasticity and ferroelectricity with large polarizations and relatively low switching barriers under ambient conditions. Several halides even possess very similar lattice constants and structures to prevailing semiconductors such as silicon, thereby enabling epitaxial growth on silicon. Moreover, based on extensive structural search, we find that the most stable two-dimensional (2D) polymorphs of monolayer halides have cohesive energies close to or even greater than their bulk counterparts, a feature not usually seen in the family of rock-salt or zinc blende semiconductors. The low transition barrier between the zinc blende phase and the layered bulk phase is predicted. Moreover, several 2D monolayer halides also exhibit multiferroicity with coupled Ferroelasticity/ferroelectricity, thereby endowing them with potential for applications as high-density integrated memory devices for efficient data reading and writing. Their surfaces, covered with halides, also provide oxidation resistance. The low cleavage energy of their layered bulk structure suggests a high likelihood of producing these 2D polymorphs through experimental exfoliation.
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intrinsic Ferroelasticity and or multiferroicity in two dimensional phosphorene and phosphorene analogues
Nano Letters, 2016Co-Authors: Menghao Wu, Xiao Cheng ZengAbstract:Phosphorene and phosphorene analogues such as SnS and SnSe monolayers are promising nanoelectronic materials with desired bandgap, high carrier mobility, and anisotropic structures. Here, we show first-principles calculation evidence that these monolayers are potentially the long-sought two-dimensional (2D) materials that can combine electronic transistor characteristic with nonvolatile memory readable/writeable capability at ambient condition. Specifically, phosphorene is predicted to be a 2D intrinsic ferroelastic material with ultrahigh reversible strain, whereas SnS, SnSe, GeS, and GeSe monolayers are multiferroic with coupled ferroelectricity and Ferroelasticity. Moreover, their low-switching barriers render room-temperature nonvolatile memory accessible, and their notable structural anisotropy enables ferroelastic or ferroelectric switching readily readable via electrical, thermal, optical, mechanical, or even spintronic detection upon the swapping of the zigzag and armchair direction. In addition, ...