Giant Elastocaloric Effect in Ni-Mn-Ga-Based Alloys Boosted by a Large Lattice Volume Change upon the Martensitic Transformation

2021 ◽  
Author(s):  
Dong Li ◽  
Zongbin Li ◽  
Xiaoliang Zhang ◽  
Cong Liu ◽  
Guoyao Zhang ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Volume Change ◽  
Lattice Volume ◽  
Elastocaloric Effect ◽  
Large Lattice

Operando XRD study of LiMn1.5Ni0.5O4 high-voltage cathode under high-rate charge-discharge reaction

2019 ◽  
Vol 34 (S1) ◽  
pp. S8-S13
Author(s):  
T. Konya ◽  
Y. Shiramata ◽  
T. Nakamura
Keyword(s):  
Volume Change ◽  
Low Voltage ◽  
High Rate ◽  
Insertion Reaction ◽  
Phase Reaction ◽  
Two Phase ◽  
Voltage Range ◽  
Lattice Volume ◽  
Rate Determining Step ◽  
Spinel Cathode

Structural variation of LiMn1.5Ni0.5O4 spinel cathode during the Li+ extraction/insertion reaction was studied using operando X-ray diffraction. It was found that the reaction in the voltage range from 3.5 to 4.9 V consisted of two consecutive two-phase reactions, where three spinel phases of LiMn1.5Ni0.5O4, Li0.5Mn1.5Ni0.5O4 and Mn1.5Ni0.5O4 were identified and the lattice volume change in the whole reaction was evaluated as 6%. The reactions were symmetric and reversible under low-current conditions, but some asymmetries were detected during high current operation. Furthermore, a two-phase reaction between cubic and tetragonal phases was observed in the low-voltage reaction at 2.1–3.5 V, where the lattice volume change was approximately 4.9%. The rate-determining step was discussed based on these operando results.

Elastocaloric effect dependency in [001]-oriented titanium nickelide single crystals, containing nanosized Ti3Ni4 particles

2021 ◽  
pp. 114-119
Author(s):  
N.Yu. Surikov ◽  
◽  
E.Yu. Panchenko ◽  
Yu.I. Chumlyakov ◽  
◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Mechanical Energy ◽  
Coefficient Of Performance ◽  
Dissipated Energy ◽  
Working Cycle ◽  
Elastocaloric Effect ◽  
Adiabatic Cooling ◽  
Experimental Values

The temperature dependence of the elastocaloric effect were studied and experimental values of the adiabatic cooling Δ T ad in loading/unloading cycles up to 13.3 K in quenched and 16.4 K in aged at 573 K, 1 h Ni50.6Ti49.4 single crystals were obtained. In aged crystals, a specific feature of the elastocaloric effect temperature dependence (an increase in Δ T ad above the temperature T R = 273 K) was found, which is associated with a change in the sequence of stress-induced martensitic transformation from R-B19' to B2-B19'. The factors (the value of the dissipated energy in the working cycle, the strain hardening coefficient during the stress-induced martensitic transformation), that affect the elastocaloric effect, are discussed. It is shown, that aged single crystals have a high coefficient of performance value up to 31, which characterizes the efficiency of converting mechanical energy into thermal energy, and are promising for solid-state cooling technologies.

Martensitic transformation and elastocaloric effect of Ti–Ni–Cu–Al microwire

Materialia ◽  
2020 ◽  
Vol 9 ◽  
pp. 100547 ◽  
Author(s):  
Fei Xiao ◽  
Zhenxing Li ◽  
Hong Chen ◽  
Zhu Li ◽  
Kai Huang ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Elastocaloric Effect

Relation between martensite morphology and volume change accompanying fcc to bcc martensitic transformation in Fe–Ni–Co alloys

2006 ◽  
Vol 438-440 ◽  
pp. 241-245 ◽  
Author(s):  
A. Shibata ◽  
H. Yonezawa ◽  
K. Yabuuchi ◽  
S. Morito ◽  
T. Furuhara ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Volume Change ◽  
Co Alloys
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