Structure and properties of solid solutions in the Mg-Al-B system

• Authors: Ludmila Sevastyanova , Olga Gulish , Vladimir Stupnikov , Vladimir Genchel , Oleg Kravchenko , Boris Bulychev , Roman Lunin , Valeriy Tarasov
• Languages of publication: EN

Abstracts

EN

Compounds with the general formula Mg1−x
AlxB2 were obtained by two-step ceramic synthesis. All compounds were characterized by X-ray diffraction, NMR spectroscopy, and by four point probe resistivity measurements in various magnetic fields method. The diborides unit cell parameters were determined as a function of the Al mole fraction. With the vaues of x up to 0.40 (where x is the composition of the stock prepared for sintering), the unit cell parameters of Mg1−x
AlxB2 are similar to those of pure MgB2 and the superconducting transition temperature was lowered. For stock compositions of 0:25 ≤ x ≤ 0:60, the products contain a superstructure, also superconducting phase, which becomes the only product at x = 0:50, and at x > 0:60 this phase is replaced by AlB2-based solid solutions.

Keywords

EN

magnesium diboride; superconductivity; superstructure

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2012
• Volume: 10
• Issue: 1
• Pages: 189-196

Dates

published

1 - 2 - 2012

online

3 - 12 - 2011

Contributors

author

Ludmila Sevastyanova

• Department of Chemistry, Moscow State University, 119992, Moscow, Russia

author

Olga Gulish

• Department of Chemistry, Moscow State University, 119992, Moscow, Russia

author

Vladimir Stupnikov

• Department of Chemistry, Moscow State University, 119992, Moscow, Russia

author

Vladimir Genchel

• Department of Chemistry, Moscow State University, 119992, Moscow, Russia

author

Oleg Kravchenko

• Department of Chemistry, Moscow State University, 119992, Moscow, Russia

author

Boris Bulychev

• Department of Chemistry, Moscow State University, 119992, Moscow, Russia

author

Roman Lunin

• Department of Physics, Moscow State University, 119992, Moscow, Russia

author

Valeriy Tarasov

• Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, 119991, Moscow, Russia

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Identifiers

DOI

10.2478/s11534-011-0013-8