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Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2   
Yazarlar
Prof. Dr. Özgür ÖZTÜRK
Kastamonu Üniversitesi, Türkiye
Doç. Dr. Elif AŞIKUZUN TOKEŞER
Kastamonu Üniversitesi, Türkiye
Öğr. Gör. Dr. Şeydanur KAYA
Kastamonu Üniversitesi, Türkiye
Murat Erdem
Abant İzzet Baysal Üniversitesi, Türkiye
Serap Safran
Ankara Üniversitesi, Türkiye
Atilla Kılıç
Abant İzzet Baysal Üniversitesi, Türkiye
Cabir Terzioğlu
Abant İzzet Baysal Üniversitesi, Türkiye
Özet
The effects of Ar ambient pressure (vacuum and 0, 10, and 20 B) and annealing times (0.5 and 1 h) on microstructural, superconducting, and mechanical properties of bulk superconducting MgB2 are investigated. The samples are produced using the solid-state reaction method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements are performed for determination of the crystal structure and surface morphology of MgB2 samples, respectively. The superconducting properties are studied by AC magnetic susceptibility measurements. Microhardness analyses are made using the Vickers microhardness test for determination of mechanical properties of all samples. Increasing the Ar pressure decreases the lattice parameters and hence the average grain size. Increasing the annealing time results in larger lattice parameters and larger grain formation. The susceptibility measurements revealed a two-step transition which is reminiscent of granular superconductors. The intra-grain transition temperature is determined to be 38.4 K for all samples. The inter-grain transition temperature of 37.2 K is obtained for samples produced under Ar ambient pressure. The samples produced under Ar ambient pressure have better superconducting properties than the ones produced in vacuum. Increasing the annealing time under vacuum further decreases the superconducting properties probably due to Mg loss.
Anahtar Kelimeler
MgB superconductors 2 | SEM | Susceptibility | Vickers microhardness | XRD
Makale Türü Özgün Makale
Makale Alt Türü SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale
Dergi Adı Journal of Superconductivity and Novel Magnetism
Dergi ISSN 1557-1939
Dergi Tarandığı Indeksler SCI-Expanded
Makale Dili İngilizce
Basım Tarihi 07-2015
Cilt No 28
Sayı 7
Sayfalar 1943 / 1952
Doi Numarası 10.1007/s10948-015-3003-z
Makale Linki http://link.springer.com/10.1007/s10948-015-3003-z
BM Sürdürülebilir Kalkınma Amaçları
Atıf Sayıları
SCOPUS 9
Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2

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