{"title":"Subjugating extensive magnetostructural temperature window and giant magnetocaloric effect in B-doped (MnNiSi)0.67(Fe2Ge)0.33 hexagonal system","authors":"J. Sridhar Mohanty, Saheli Samanta, Kalyan Mandal","doi":"10.1103/physrevmaterials.8.094407","DOIUrl":null,"url":null,"abstract":"Coupled first-order magnetostructural transformations (FOMSTs) with narrow widths governed by low external stimuli play a crucial role in magnetic refrigeration for ferromagnetic hexagonal systems. In this work, we report a family of magnetocaloric materials named boron (B)-doped <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mrow><mo>(</mo><mi>MnNiSi</mi><mo>)</mo></mrow><mrow><mn>0.67</mn></mrow></msub><msub><mrow><mo>(</mo><mrow><mi mathvariant=\"normal\">F</mi><msub><mi mathvariant=\"normal\">e</mi><mn>2</mn></msub><mi>Ge</mi></mrow><mo>)</mo></mrow><mrow><mn>0.33</mn></mrow></msub></mrow></math> compounds that are devoid of rare-earth elements. Our results show that varying B concentrations up to 5 at. % can tailor the robust FOMSTs between the low-temperature ferromagnetic orthorhombic phase and the high-temperature paramagnetic hexagonal phase in a wider temperature regime. A dramatic change in hysteresis (<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">Δ</mi><msub><mi>T</mi><mi>hys</mi></msub></mrow></math>) from ∼25 K for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>x</mi><mo>=</mo><mn>0</mn></mrow></math> to ∼8 (9) K as well as increases in the saturation magnetization for specific 2 (3) at. % of B dopants is pronounced. Henceforth, the origin of the reducing hysteresis is illustrated based on the geometrical compatibility conditions <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><msub><mi>λ</mi><mn>2</mn></msub><mo>∼</mo><mn>1</mn><mo>)</mo></mrow></math> between the austenite and martensite phases using temperature-dependent powder x-ray diffraction analysis. Moreover, we found the samples performed with good functional stability from the thermal cycling run. The branch of these B doping materials exhibits robust features of a large magnetocaloric effect (MCE) over an extensive temperature range (∼71 K) and temperature-averaged magnetic entropy change at a lower magnetic field change of 2 T. These several tangible benefits, such as reduced <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi mathvariant=\"normal\">Δ</mi><msub><mi>T</mi><mi>hys</mi></msub></mrow></math>, geometrical compatibility, and robust MCE properties are first reported in the studied hexagonal system. Therefore, our results offer a viable approach to improve the cascading of these materials towards the application of cooling technology.","PeriodicalId":20545,"journal":{"name":"Physical Review Materials","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1103/physrevmaterials.8.094407","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Coupled first-order magnetostructural transformations (FOMSTs) with narrow widths governed by low external stimuli play a crucial role in magnetic refrigeration for ferromagnetic hexagonal systems. In this work, we report a family of magnetocaloric materials named boron (B)-doped compounds that are devoid of rare-earth elements. Our results show that varying B concentrations up to 5 at. % can tailor the robust FOMSTs between the low-temperature ferromagnetic orthorhombic phase and the high-temperature paramagnetic hexagonal phase in a wider temperature regime. A dramatic change in hysteresis () from ∼25 K for to ∼8 (9) K as well as increases in the saturation magnetization for specific 2 (3) at. % of B dopants is pronounced. Henceforth, the origin of the reducing hysteresis is illustrated based on the geometrical compatibility conditions between the austenite and martensite phases using temperature-dependent powder x-ray diffraction analysis. Moreover, we found the samples performed with good functional stability from the thermal cycling run. The branch of these B doping materials exhibits robust features of a large magnetocaloric effect (MCE) over an extensive temperature range (∼71 K) and temperature-averaged magnetic entropy change at a lower magnetic field change of 2 T. These several tangible benefits, such as reduced , geometrical compatibility, and robust MCE properties are first reported in the studied hexagonal system. Therefore, our results offer a viable approach to improve the cascading of these materials towards the application of cooling technology.
期刊介绍:
Physical Review Materials is a new broad-scope international journal for the multidisciplinary community engaged in research on materials. It is intended to fill a gap in the family of existing Physical Review journals that publish materials research. This field has grown rapidly in recent years and is increasingly being carried out in a way that transcends conventional subject boundaries. The journal was created to provide a common publication and reference source to the expanding community of physicists, materials scientists, chemists, engineers, and researchers in related disciplines that carry out high-quality original research in materials. It will share the same commitment to the high quality expected of all APS publications.