Materials with Giant Mechanocaloric Effects: Cooling by Strength

Mañosa, Lluı́s; Planes, Antoni

doi:10.1002/adma.201603607

Cited by 365 publications

(232 citation statements)

References 169 publications

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“…BCE observed around the triple points demonstrate options worthy of attention and are comparable with the caloric parameters of the known solid refrigerants of different origin. [1,2,3,17] In both compounds, the conversion from the conventional BCE to the inverse is observed in very narrow temperature change and followed by gigantic change of both |∆S BCE | and |∆T AD |. The possibility of improving the barocaloric properties by changing the chemical pressure is discussed.…”

Section: Resultsmentioning

confidence: 99%

Conventional and inverse barocaloric effects around triple points in ferroelastics (NH 4 ) 3 NbOF 6 and (NH 4 ) 3 TiOF 5

2017

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We report the conventional and inverse barocaloric effect (BCE) in ferroelastics (NH 4 ) 3 NbOF 6 and (NH 4 ) 3 TiOF 5 . We found a rich set of the structural phase transitions and triple points on the T − p phase diagrams. Extensive and intensive BCE near some transformations and around triple points in both crystals are outstanding (|∆S max BCE |=30-100 J·(kg·K) −1 ; |∆T max AD |=4-22 K) and can be achieved at low pressure 0.01-0.60 GPa.

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Section: Resultsmentioning

confidence: 99%

Conventional and inverse barocaloric effects around triple points in ferroelastics (NH 4 ) 3 NbOF 6 and (NH 4 ) 3 TiOF 5

2017

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“…However, C p A and C p M are approximately equal for SMAs [23]. Therefore, in the actual measurement and calculation, we supposed…”

Section: Resultsmentioning

confidence: 99%

Effects of Strain Rate and Measuring Temperature on the Elastocaloric Cooling in a Columnar-Grained Cu71Al17.5Mn11.5 Shape Memory Alloy

Wang

Huang

Xie

2017

Metals

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Solid-state refrigeration technology based on elastocaloric effects (eCEs) is attracting more and more attention from scientists and engineers. The response speed of the elastocaloric materials, which relates to the sensitivity to the strain rate and measuring temperature, is a significant parameter to evaluate the development of the elastocaloric material in device applications. Because the Cu-Al-Mn shape memory alloy (SMA) possesses a good eCE and a wide temperature window, it has been reported to be the most promising elastocaloric cooling material. In the present paper, the temperature changes (∆T) induced by reversible martensitic transformation in a columnar-grained Cu 71 Al 17.5 Mn 11.5 SMA fabricated by directional solidification were directly measured over the strain rate range of 0.005-0.19 s −1 and the measuring temperature range of 291-420 K. The maximum adiabatic ∆T of 16.5 K and a lower strain-rate sensitivity compared to TiNi-based SMAs were observed. With increasing strain rate, the ∆T value and the corresponding coefficient of performance (COP) of the alloy first increased, then achieved saturation when the strain rate reached 0.05 s −1 . When the measuring temperature rose, the ∆T value increased linearly while the COP decreased linearly. The results of our work provide theoretical reference for the design of elastocaloric cooling devices made of this alloy.

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“…The strong coupling between magnetism and structure, driven by the martensitic transformation, gives rise to their multifunctional behavior. “Giant” effects, e.g., magnetomechanical, magnetocaloric, barocaloric/elastocaloric, magnetoresistive, can be induced by external stimuli, such as magnetic field, pressure, stress and their combined application enabling their exploitation in energy‐efficient and smart technologies . Additionally, the coexistence of conventional temperature‐induced shape memory effect together with ferromagnetism broadens the range of application …”

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confidence: 99%

Magnetic Shape Memory Turns to Nano: Microstructure Controlled Actuation of Free‐Standing Nanodisks

Campanini

Nasi

Fabbrici

et al. 2018

Small

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Magnetic shape memory materials hold a great promise for next‐generation actuation devices and systems for energy conversion, thanks to the intimate coupling between structure and magnetism in their martensitic phase. Here novel magnetic shape memory free‐standing nanodisks are proposed, proving that the lack of the substrate constrains enables the exploitation of new microstructure‐controlled actuation mechanisms by the combined application of different stimuli–i.e., temperature and magnetic field. The results show that a reversible areal strain (up to 5.5%) can be achieved and tuned in intensity and sign (i.e., areal contraction or expansion) by the application of a magnetic field. The mechanisms at the basis of the actuation are investigated by experiments performed at different length scales and directly visualized by several electron microscopy techniques, including electron holography, showing that thermo/magnetomechanical properties can be optimized by engineering the martensitic microstructure through epitaxial growth and lateral confinement. These findings represent a step forward toward the development of a new class of temperature‐field controlled nanoactuators and smart nanomaterials.

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Materials with Giant Mechanocaloric Effects: Cooling by Strength

Cited by 365 publications

References 169 publications

Conventional and inverse barocaloric effects around triple points in ferroelastics (NH 4 ) 3 NbOF 6 and (NH 4 ) 3 TiOF 5

Conventional and inverse barocaloric effects around triple points in ferroelastics (NH 4 ) 3 NbOF 6 and (NH 4 ) 3 TiOF 5

Effects of Strain Rate and Measuring Temperature on the Elastocaloric Cooling in a Columnar-Grained Cu71Al17.5Mn11.5 Shape Memory Alloy

Magnetic Shape Memory Turns to Nano: Microstructure Controlled Actuation of Free‐Standing Nanodisks

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