Enhanced magnetocaloric effects in metastable phases of Mn1- x Cox NiGe generated through thermal quenching and high-pressure annealing
Document Type
Article
Publication Date
2-14-2023
Abstract
Metastable phases were formed in Mn1-xCoxNiGe (x = 0.05 and 0.08) by annealing at 800 °C followed by rapid cooling, i.e., quenching, at ambient pressure (P = 0) and under a pressure of P = 3.5 GPa, and their phase transitions and associated magnetocaloric properties were investigated. The crystal cell volumes of the metastable phases decreased, and their structural transitions significantly shifted to lower temperatures relative to those of the slow-cooled compounds, with a greater reduction observed in the samples where the rapid cooling occurred under high pressures. The magnetic and structural transitions coupled to form a magnetostructural transition in the metastable phases, resulting in large magnetic entropy changes up to - 79.6 J kg- 1 K- 1 (x = 0.08) for a 7-T field change. The experimental results demonstrate thermal quenching and high-pressure annealing as alternative methods to create magnetostructural transitions, without modifying the compositions of the materials.
Publication Source (Journal or Book title)
Journal of Applied Physics
Recommended Citation
Poudel Chhetri, T., Chen, J., Grant, A., Young, D., Dubenko, I., Talapatra, S., Ali, N., & Stadler, S. (2023). Enhanced magnetocaloric effects in metastable phases of Mn1- x Cox NiGe generated through thermal quenching and high-pressure annealing. Journal of Applied Physics, 133 (6) https://doi.org/10.1063/5.0129401