Mechanochemical Synthesis of Amorphous and Crystalline Magnesium Diboride Full article
Journal |
Inorganic Materials
ISSN: 0020-1685 , E-ISSN: 1608-3172 |
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Output data | Year: 2010, Volume: 46, Number: 1, Pages: 22-27 Pages count : 6 DOI: 10.1134/S0020168510010061 | ||||||
Tags | MGB2; SUPERCONDUCTIVITY | ||||||
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Abstract:
We have studied the phase composition of materials obtained by mechanochemical processing and subsequent heat treatment of mixtures of magnesium and boron powders in the atomic ratio 1: 2. Differential dissolution, differential scanning calorimetry, and X-ray diffraction data indicate that, during mechanical processing, some of the magnesium reacts with boron to form amorphous magnesium diboride. During annealing of the activated powder mixture, X-ray amorphous magnesium diboride forms at 340°C and crystallizes at 480°C. As shown by high-resolution transmission electron microscopy, the unreacted crystalline magnesium is covered with an amorphous layer consisting of magnesium diboride and boron. The amorphous material obtained by milling contains nuclei of MgB2 crystallites 3–5 nm in size. During subsequent heating of the activated mixture, magnesium and boron react further to form amorphous magnesium diboride and the amorphous phase crystallizes. Heating of mechanically activated mixtures to just below the crystallization temperature allow MgB2 nanoparticles to be produced. The formation of nanocrystalline magnesium diboride nuclei along with the amorphous phase during mechanochemical processing facilitates mechanochemical synthesis compared to thermal synthesis.
Cite:
Lomovsky O.I.
, Golubkova G.V.
, Dovlitova L.S.
, Zaikovskii V.I.
, Maly V.I.
Mechanochemical Synthesis of Amorphous and Crystalline Magnesium Diboride
Inorganic Materials. 2010. V.46. N1. P.22-27. DOI: 10.1134/S0020168510010061 WOS Scopus РИНЦ
Mechanochemical Synthesis of Amorphous and Crystalline Magnesium Diboride
Inorganic Materials. 2010. V.46. N1. P.22-27. DOI: 10.1134/S0020168510010061 WOS Scopus РИНЦ
Original:
Ломовский О.И.
, Голубкова Г.В.
, Довлитова Л.С.
, Зайковский В.И.
, Мали В.И.
Синтез аморфного и кристаллического диборида магния с использованием механической активации
Неорганические материалы. 2010. Т.46. №1. С.28-33. РИНЦ
Синтез аморфного и кристаллического диборида магния с использованием механической активации
Неорганические материалы. 2010. Т.46. №1. С.28-33. РИНЦ
Dates:
Submitted: | Dec 1, 2008 |
Accepted: | May 18, 2009 |
Published print: | Jan 1, 2010 |
Published online: | Jan 5, 2010 |
Identifiers:
Web of science | WOS:000273255000006 |
Scopus | 2-s2.0-73549112207 |
Elibrary | 15329641 |
Chemical Abstracts | 2010:34241 |
Chemical Abstracts (print) | 152:293950 |
OpenAlex | W2163124120 |