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http://hdl.handle.net/11375/14484
Title: | Chemical order in the Heusler alloys nickel(2) manganese(x) vanadium(1-x) tin by neutron diffraction |
Authors: | Martin, Luc |
Keywords: | Chemistry;Materials Science and Engineering;Chemistry |
Publication Date: | Mar-1982 |
Abstract: | <p>The chemical ordering in samples of Heusler alloys of the series Ni₂MnxV₁-xSn, where x stands for 1.0, 0.8, and 0.6, has been measured by neutron diffraction. Measurements were performed at room temperature. The samples were long thing single crystals with cross-section less than 1 mm. The samples had been cut by spark erosion from large single crystal boules. Extinction was still present. The data were fitted with a nuclear structure factor, allowing for chemical disorder, based on a model of the crystal structure. They highly order in the L2₁ type crystal structure. Slight Mn, V←→Ni disorder was sufficient to explain the data. For x=1.0, (3.5 ± 1.2) at % disorder between Mn-V and Ni atoms was necessary to obtain the best fit. For x=0.8 the best fit was obtained with no disorder. Disorder was (2.8 ± 0.9) at % between Mn-V and Ni atoms for the x=0.6 sample. No evidence of any other type of disorder was found.</p> |
URI: | http://hdl.handle.net/11375/14484 |
Identifier: | ee4bi6/79 1078 1907358 |
Appears in Collections: | EE 4BI6 Electrical Engineering Biomedical Capstones |
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fulltext.pdf | 2.14 MB | Adobe PDF | View/Open |
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