Pressure effect on magnetic phase transitions in slowly cooled NiMn1-Cr Ge
| Autor: | A. Sivachenko, R. Duraj, A. Szytuła, Teresa Jaworska-Gołąb, V. P. Dyakonov, Aleksandra Deptuch, V. Val'kov, Yu. Tyvanchuk |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Phase transition Materials science Triple point Mechanical Engineering Transition temperature Hydrostatic pressure Metals and Alloys Thermodynamics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Mechanics of Materials Martensite 0103 physical sciences Materials Chemistry Magnetic phase 0210 nano-technology Phase diagram Ambient pressure |
| Zdroj: | Journal of Alloys and Compounds. 741:449-453 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.01.064 |
| Popis: | For a slowly cooled series of NiMn1-xCrxGe half-Heusler alloys (x = 0.04, 0.11, 0.18 and 0.25) the magnetostructural (P,T) phase diagrams, under hydrostatic pressure up to 13.5 kbar, were determined. At ambient pressure a magnetic (second order) transition and a structural (first order, martensitic) phase transition are observed. The temperature of the magnetic phase transition increases while the one of the structural phase transition decreases with increasing pressure. The lines of these dependences intersect at so-called triple point (PTRI, TTRI) and a magneto-structural (first order) phase transition develops with further pressure increase. The magneto-structural transition temperature decreases with increasing pressure. The value of the triple point pressure PTRI decreases with increasing Cr content, from about 8 kbar (for x = 0.04) to about 1 kbar (for x = 0.25) on heating. |
| Databáze: | OpenAIRE |
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