caa a22 4500 445380020 CHVBK 20180317143014.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10948-011-1134-4 doi (NATIONALLICENCE)springer-10.1007/s10948-011-1134-4 Elsabawy Khaled Chemistry Department, Faculty of Science, Tanta University, 31725, Tanta, Egypt aut Narrow Range of Hafnium Doping for Promoted Mechanical Properties and Critical Current Density ( J c ) Values ofMg1− x Hf x B2 Superconductor [Elektronische Daten] [Khaled Elsabawy] Hafnium was used as a softener dopant to replace at magnesium sites of Mg1−x Hf x B2 regime (where x=0.0, 0.05, 0.1, 0.2, and 0.4 mole). Samples were prepared via high temperature solid state reaction technique depending upon diffusion mechanism of Mg-vapor ions through hafnium-boron matrix. The maximum solubility limit of hafnium (n) was found to be ∼0.22mole. The crystalline lattice constants exhibit slight elongation in the case of the c-axis as x increases. Furthermore, the effect of Hf-doping on the microstructure properties of the MgB2 system was investigated carefully. The SE-microscopic analysis indicated that hafnium ions diffuse regularly through surface and bulk in case of (x=0.05-0.2mole). The grain size was estimated and found to be between 0.33 and 1.34μm. The mechanical tensile strength of the samples was clearly improved linearly as Hf-content increased, recording the maximum tensile strength of 34.8 MPa for the sample with x=0.4mole. Avisualization of the Hf-doped MgB2 structure was constructed and investigated to confirm the success of hafnium substitutions at the Mg-sites of the MgB2 superconductor. Springer Science+Business Media, LLC, 2011 Doped MgB2 nationallicence Diffusion mechanism nationallicence X-ray nationallicence SE-microscopy nationallicence Mechanical properties nationallicence Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/6(2011-08-01), 1853-1861 1557-1939 24:6<1853 2011 24 10948 https://doi.org/10.1007/s10948-011-1134-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-011-1134-4 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Elsabawy Khaled Chemistry Department, Faculty of Science, Tanta University, 31725, Tanta, Egypt aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/6(2011-08-01), 1853-1861 1557-1939 24:6<1853 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer