13 research outputs found
Higher borides and oxygen-enriched Mg-B-O inclusions as possible pinning centers in nanostructural magnesium diboride and the influence of additives on their formation
The study of high pressure (2 GPa) synthesized MgB2-based materials allows us
to conclude that higher borides (with near MgB12 stoichiometry) and
oxygen-enriched Mg-B-O inclusions can be pinning centers in nanostructural
magnesium diboride matrix (with average grain sizes of 15-37 nm). It has been
established that additions of Ti or SiC as well as manufacturing temperature
can affect the size, amount and distribution of these inclusions in the
material structure and thus, influence critical current density. The
superconducting behavior of materials with near MgB12 stoichiometry of matrix
is discussed.Comment: 4 pages, 1 figues, presented at VORTEX VI-2009, accepted for Physica
Influence of Oxygen and Boron Distribution on the Superconducting Characteristics of Nanostructural Mg-B-O Ceramics
International audienc
Oxygenation of the traditional and thin-walled MT-YBCO in flowing oxygen and under high evaluated oxygen pressure
International audienc
Temperatureâpressure induced nano-structural inhomogenities for vortex pinning in bulk MgB2 of different connectivity
International audienc
High-Pressure High-Temperature Synthesis of Nanostructural Magnesium Diboride for Electromotors and Devices Working at Liquid Hydrogen Temperatures
Effect of Nanostructural Inhomogeneities on the Superconducting Characteristics of <inline-formula> <tex-math notation="TeX"></tex-math></inline-formula> With Enhanced Grain Connectivity
The effect of high-pressure synthesis on flux pinning in MgB2-based superconductors
International audienceIncreasing the pressure during manufacturing MgB2 enhances the volume pinning force and moves the position of the maximum to higher magnetic fields. A similar shift was observed when Ti or SiC was added and the maximum of the volume pinning force was found at higher fields in in situ synthesized materials than in ex situ sintered samples. We attribute the observed changes to MgâBâO oxygen-enriched regions and grains of higher magnesium borides in the MgB2 matrix. High-temperature processed materials demonstrated mainly point or mixed pinning while grain boundary pinning dominated after low-temperature synthesis
The effect of high-pressure synthesis on flux pinning in MgB2-based superconductors
International audienceIncreasing the pressure during manufacturing MgB2 enhances the volume pinning force and moves the position of the maximum to higher magnetic fields. A similar shift was observed when Ti or SiC was added and the maximum of the volume pinning force was found at higher fields in in situ synthesized materials than in ex situ sintered samples. We attribute the observed changes to MgâBâO oxygen-enriched regions and grains of higher magnesium borides in the MgB2 matrix. High-temperature processed materials demonstrated mainly point or mixed pinning while grain boundary pinning dominated after low-temperature synthesis