Martensite-austenite and Ferromagnetic-paramagnetic Transformations in Ni2-xAxMn1-yByGa1-zCz (A, B=Co; C=Al) Heusler Alloys
| Autor: | Viorel Dobrea, Mihai Lozovan, Mihail-Liviu Craus |
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| Rok vydání: | 2009 |
| Předmět: |
Austenite
Materials science Condensed matter physics Materials Science (miscellaneous) Process Chemistry and Technology General Engineering General Chemistry General Medicine General Biochemistry Genetics and Molecular Biology Paramagnetism Ferromagnetism Martensite Materials Chemistry C/AL General Pharmacology Toxicology and Pharmaceutics computer computer.programming_language |
| Zdroj: | Revista de Chimie. 59 |
| ISSN: | 2668-8212 0034-7752 |
| DOI: | 10.37358/rc.08.12.2058 |
| Popis: | Ni2MnGa Heusler alloy is known as a potential smart material. At room temperature it has a L21 type structure, undergoing a martensitic transition (TM) at low temperatures. Some authors have classified Ni-Mn-Ga Heusler alloys on the values of martensitic transformation and Curie temperatures: first group formed by alloys with TM below room temperature and TC, second group with TM around room temperature and third group with TM]TC. The partial substitution of Ni with Mn leads to an increase of the transition temperature and a decrease of the Curie temperature. The Ni2-xMn1+xGa alloys have a complex tetragonal structure at room temperature. The substitution of Ga with Al can change the crystalline and magnetic structure of Heusler alloys: Ni2MnAl is antiferromagnetic for a B2 (CsCl type, with Mn and Al randomly distributed in the center of the cube) structure and ferromagnetic for a L21 (BiF3 type with Mn and Al ordered distributed in the cube center) structure. We intend to put in evidence a dependence between the applied magnetic field on a side, and the transition temperature, on other side, for the Ni2-xAxMn1-yByGa1-zCz (A, B=Co; C=Al) Heusler alloys. |
| Databáze: | OpenAIRE |
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