| Autor: |
C. Bernini, G. Bruzzone, Alberto Martinelli, E. Magnone, Maurizio Ferretti, S. Rubino |
| Rok vydání: |
2004 |
| Předmět: |
|
| Zdroj: |
Journal of Materials Science. 39:5333-5337 |
| ISSN: |
0022-2461 |
| DOI: |
10.1023/b:jmsc.0000039239.47777.f9 |
| Popis: |
Several methods have been tested in order to prepare the perovskite type compound Mg x C y Ni3 applying the mechanical alloying (MA), the self-propagating high-temperature synthesis (SHS) and the isothermal heating techniques in the different steps of preparation. These methods may be summarized as follows: method MCN-1) synthesis of the Mg x C y Ni3 phase through MA of Mg2Ni (previously synthesised by isothermal heating) and selected amounts of graphite and Ni, followed by isothermal treatment; method MCN-2) synthesis of the Mg x C y Ni3 phase applying the SHS technique using powder compacts; method MCN-3) synthesis of an eutectic sample composed of Ni and MgNi2 by means of isothermal heating, subsequent MA with graphite and final synthesis of Mg x C y Ni3 by means of SHS. The methods MCN-2 and MCN-3 proved their validity to the synthesis of the desired compound with two main important results: complete conversion of the reactants into Mg x C y Ni3 and control of the stoichiometry in the final product. For instance method MCN-1 shows instead a very low degree of conversion of the reactants. All the phases obtained after each preparation step (MA, SHS, isothermal heating) have been characterized by means of X-ray powder diffraction (XRPD), scanning electron microscopy (SEM) coupled with electron dispersive spectroscopy (EDS). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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