Structure and Properties of MgB₂Bulks, Thin Films, and Wires

Bulk MgB2 Superconducting Materials: Technology, Properties, and Applications

“…The superconducting characteristics of MgB 2 materials depend on many factors and their combination. Very deep and comprehensive studies of the synthesis process of MgB 2 -based materials, the correlation between material structure and superconducting characteristics, and the manufacturing technology have been performed by the authors of [ 7 , 8 , 9 , 10 , 11 , 16 , 19 , 73 , 76 , 82 , 84 , 85 , 98 , 99 , 101 , 102 , 103 , 104 , 105 , 106 , 107 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 ]. These correlations were comprehensively studied for materials prepared using initial powders of MgB 2 and stoichiometric Mg:2B mixtures (typical characteristics are given in Table 1 ) at manufacturing temperatures in the range of 600–1100 °C under different pressure conditions using the methods noted above.…”

“…These facts stimulated the authors of [ 10 , 11 , 117 , 130 , 132 ] to perform detailed structural studies of MgB 2 and modeling of electron density in MgB 2-x Ox structures, binding energy, structure variations, and enthalpy of solid solutions formation.…”

“…Rietveld refinements of the MgB 2 phases of the X-ray patterns of 10 samples with high critical current densities have demonstrated that they contained some solved oxygen, the amount of which was very similar in all the materials—within MgB 1.68–1.8 O 0.2–0.32 stoichometry [ 10 , 11 , 117 , 130 ].…”

“…The calculations of the DOS for MgB 2-x O x and MgB 2-x C x compounds for 0 < x ≤ 1 demonstrate that all the compounds have a metal-like behavior near the Fermi level [ 130 ]. In the case of the substitution of boron by oxygen, the lowest DOS of about 0.46 states/eV/f.u.…”

Improvement of microwave characteristics for high-T c superconductor (YBCO) films by ion irradiation treatment

“…The modern trend in fabrication technology of high-T c superconducting materials (HTSs) for applications in electrical engineering and electronics is related to the incorporation in the interior of the superconductor material of an artificial defect nanostructure consisting of additional nano-sized general strong pinning sites for vortices, thus enhancing the critical current value [1][2][3][4][5][6][7][8][9][10][11].…”