ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Single crystals of AlMgB 〈sub〉14〈/sub〉 and AlMgB 〈sub〉22〈/sub〉 were grown from a high-temperature aluminum metal flux in an Ar atmosphere. The optimum conditions for growing AlMgB 〈sub〉22〈/sub〉 and AlMgB 〈sub〉14〈/sub〉 were established using the starting mixtures of B/Mg=0.5-1.0 and B/Mg=2.0-6.0. The AlMgB 〈sub〉14〈/sub〉 and AlMgB 〈sub〉22〈/sub〉 crystals obtained have well-developed {001} and {100} faces, and were black with a metallic luster. The maximum dimensions of these crystals were about 5.2 mm and 4.6 mm, respectively. The values of micro-Vickers hardness of the AlMgB 〈sub〉14〈/sub〉 and AlMgB 〈sub〉22〈/sub〉 crystals are in the ranges of 23.9±0.6-27.6±0.6 GPa. The oxidation process of AlMgB 〈sub〉14〈/sub〉 and AlMgB 〈sub〉22〈/sub〉 crystals were studied up to 1473 K by TG-DTA method. The susceptibility of AlMgB14 with an increase at low temperatures does not show any particular features, being indicative of a paramagnetic contribution, which is likely due to impurities. The susceptibility of the AlMgB 〈sub〉22〈/sub〉 sample shows no apparentcontribution from impurities and also does not have any anomalous behavior
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.365.pdf
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