Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2

ÖZTÜRK, Özgür; AŞIKUZUN TOKEŞER, Elif; KAYA, Şeydanur; Erdem, M.; Safran, S.; Kilic, A.; Terzioglu, C.

doi:10.1007/s10948-015-3003-z

Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2

Yazarlar (7)

Prof. Dr. Özgür ÖZTÜRK Kastamonu Üniversitesi, Türkiye

Doç. Dr. Elif AŞIKUZUN TOKEŞER Kastamonu Üniversitesi, Türkiye

Öğr. Gör. Dr. Şeydanur KAYA Kastamonu Üniversitesi, Türkiye

M. Erdem
Bolu Abant İzzet Baysal Üniversitesi, Türkiye

S. Safran
Ankara Üniversitesi, Türkiye

A. Kilic
Ankara Üniversitesi, Türkiye

C. Terzioglu
Bolu Abant İzzet Baysal Üniversitesi, Türkiye

Makale Türü	Özgün Makale (SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale)
Dergi Adı	Journal of Superconductivity and Novel Magnetism (Q3)
Dergi ISSN	1557-1939 Dergi Bilgileri (2015)
Dergi Tarandığı Indeksler	SCI-Expanded
Makale Dili	İngilizce	Basım Tarihi	07-2015
Kabul Tarihi	–	Yayınlanma Tarihi	13-02-2015
Cilt / Sayı / Sayfa	28 / 7 / 1943–1952	DOI	10.1007/s10948-015-3003-z
Makale Linki	http://link.springer.com/10.1007/s10948-015-3003-z
UAK Araştırma Alanları	Yarı İletkenler

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

MgB2 superconductors | SEM | Susceptibility | Vickers microhardness | XRD

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Atıf Sayıları
Scopus	11

Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2

Dergi Adı	Journal of Superconductivity and Novel Magnetism
Kısa Adı	J SUPERCOND NOV MAGN
Yayıncı	SPRINGER
Açık Erişim	Hayır
ISSN	1557-1939
E-ISSN	1557-1947
Wos Quartile	Q3
Scopus Quartile	Q3
Tarandığı Indeksler	SCIE , Scopus
WoS Kategoriler	PHYSICS, APPLIED \| PHYSICS, CONDENSED MATTER
Scopus Kategoriler	CONDENSED MATTER PHYSICS \| ELECTRONIC, OPTICAL AND MAGNETIC MATERIALS

Ac Susceptibility Measurements and Mechanical Performance of Bulk MgB2

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