Induced ordering in electrodeposited nanocrystalline Ni-Mn alloys
| Autor: | Francesca Rossi, Lucia Nasi, M.V. Ananth, N. Ponpandian, V. Ravichandran, A. Stephen, Claudio Ferrari |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Mössbauer effect 76.80.+y Mössbauer effect other X-ray spectroscopy in condensed matter General Physics and Astronomy 81.15.Pq Electrodeposition electroplating 75.70.Ak Magnetic properties of monolayers and thin films Nanocrystalline material Crystallography Differential scanning calorimetry Electron diffraction Transmission electron microscopy X-ray crystallography Curie temperature Selected area diffraction 75.30.Kz Magnetic phase boundaries (including magnetic transitions metamagnetism etc.) 72.15.Jf Thermoelectric and thermomagnetic effects |
| Zdroj: | Journal of applied physics 103 (2008): 053511-1. doi:10.1063/1.2844211 info:cnr-pdr/source/autori:Arumainathan S.; Rossi F.; Nasi L.; Ferrari C.; Ponpandian N.; Ananth M. V.; Ravichandran V./titolo:Induced ordering in electrodeposited nanocrystalline Ni-Mn alloys/doi:10.1063%2F1.2844211/rivista:Journal of applied physics/anno:2008/pagina_da:053511-1/pagina_a:/intervallo_pagine:053511-1/volume:103 |
| DOI: | 10.1063/1.2844211 |
| Popis: | The Ni3Mn type of ordering in nanocrystalline NiMn films with different compositions prepared by electrodeposition was investigated by using x-ray diffraction, differential scanning calorimetry (DSC) thermogravimetric analyzer, Mössbauer spectroscopy, and transmission electron microscopy. The investigations reveal the existence of composition-induced Ni3Mn-type ordering in the as-deposited film of 76.2 at. % Ni. The atomic disorder is characterized by an exothermic effect in DSC. An analysis of the broad exothermic transition reveals the stages of phase transformation leading to ordering. The Curie temperatures of the alloys were determined from thermomagnetic measurements, the maximum value obtained for the ordered sample. Mössbauer spectroscopy at room temperature reveals ordered (ferromagnetic) and disordered (paramagnetic) phases in the as-deposited films. Superlattice reflections observed in selected area electron diffraction pattern for the 76.2 at. % Ni film alone further support the observation of composition-specific atomic ordering. |
| Databáze: | OpenAIRE |
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