Vanadyum katkısının MgB2 süperiletken sisteminin yapısal ve manyetik özellikleri üzerine etkisi
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Dosyalar
Tarih
2006
Yazarlar
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Cilt Başlığı
Yayıncı
İnönü Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalışmada MgB2 sistemine (MgB2)2-xVx formunda vanadyum katkılanarak hazırlanan bileşiklerin yapısal ve manyetik özellikleri incelenmiştir. Örnekler katıhal reaksiyon yöntemiyle argon atmosferinde hazırlanmıştır. Örneklerin yapısal karakterizasyonu XRD ve SEM ölçümleri kullanılarak gerçekleştirilmiştir. Manyetik özellikleri ise M-T ve M-H ölçümleri ile belirlenmiştir. XRD sonuçları, vanadyumun yapı içerisinde MgB2'ye bağlanmadığını, bulk yapı içerisinde ya vanadyum olarak ya da VB veya V1.54B50 şeklinde safsızlık fazı olarak kaldığını göstermiştir. Örneklerin SEM ölçümleri, MgB2'nin tanecikli yapısının elde edildiğini göstermiştir. Yapıda belirli bir yönelim gözlenmemiş fakat taneciklerin sıkı bağlı olduğu ve porozitenin düşük seviyede olduğu belirlenmiştir. M-H ölçümleri ise vanadyum katkı oranının artmasıyla gram başına diamanyetik sinyalde azalma göstermiştir. En yüksek Jc değeri 8 105 A/cm2 olarak bulunmuştur. M-T ölçümlerinde ise örneklerin kritik sıcaklığı 40K olarak belirlenmiştir. Ayrıca, x=0.4 ve x=0.7 vanadyum katkılı örneklerin M-T ölçümlerinde pozitif manyetizasyon yani paramanyetik katkı gözlenmiştir. Anahtar kelimeler: Süperiletkenlik, MgB2, kritik akım yoğunluğu, paramanyetizma, : diamanyetizma. i
In this study, structural and magnetic properties of compounds, which prepared by doping Vanadium in form of (MgB2)2-xVx to MgB2, system were investigated.. Samples were prepared with solid state reaction method in argon atmosphere. Structural characterization of samples was carried out by XRD and SEM measurements. Magnetic properties were determined by M-H and M-T measurements. XRD results showed that vanadium could not bind to MgB2 but remained in bulk structure as vanadium or as inpurity phase in the form of VB or V1.54B50. SEM measurement of samples showed that granular structure of MgB2. The definite align in the crystal structure was not observed but it was determined as granules which were tightly bonded and porosity was at low level. In M-H measurements diamagnetic signal per grams which was decreased with the increasing ratio of vanadium dope. The highest Jc was determined 8.4 105 A/cm5 in our samples. Critical temperature of samples were determined at 40K in the M-T measurements. Also positive magnetization means paramagnetic contribution was observed in M-T measurements at x=0.4 and x=0.7 in the vanadium doped samples. Key Words: Superconductivity, MgB2 superconductor, critical current density, paramagnetism, diamagnetism. ii
In this study, structural and magnetic properties of compounds, which prepared by doping Vanadium in form of (MgB2)2-xVx to MgB2, system were investigated.. Samples were prepared with solid state reaction method in argon atmosphere. Structural characterization of samples was carried out by XRD and SEM measurements. Magnetic properties were determined by M-H and M-T measurements. XRD results showed that vanadium could not bind to MgB2 but remained in bulk structure as vanadium or as inpurity phase in the form of VB or V1.54B50. SEM measurement of samples showed that granular structure of MgB2. The definite align in the crystal structure was not observed but it was determined as granules which were tightly bonded and porosity was at low level. In M-H measurements diamagnetic signal per grams which was decreased with the increasing ratio of vanadium dope. The highest Jc was determined 8.4 105 A/cm5 in our samples. Critical temperature of samples were determined at 40K in the M-T measurements. Also positive magnetization means paramagnetic contribution was observed in M-T measurements at x=0.4 and x=0.7 in the vanadium doped samples. Key Words: Superconductivity, MgB2 superconductor, critical current density, paramagnetism, diamagnetism. ii
Açıklama
Anahtar Kelimeler
Fizik ve Fizik Mühendisliği, Physics and Physics Engineering
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Künye
Kaya, D. (2006). Vanadyum katkısının MgB2 süperiletken sisteminin yapısal ve manyetik özellikleri üzerine etkisi. Yayımlanmış Yüksek lisans Tezi, İnönü Üniversitesi, Malatya.
