Rapid Suppression of Superconductivity in Co3O4 nanoparticles-added Bi-2212 ceramics

Anahtar Kelimeler:

Yüksek sıcaklık süperiletkenleri, XRD, SEM, Manyetik Histerezis, Kritik akım yoğunluğu.

Rapid Suppression of Superconductivity in Co3O4 nanoparticles-added Bi-2212 ceramics

Bu çalışma, sırasıyla x = 0, 0.5, 1 ve 2 için %x ağırlıkça Co3O4 nano parçacıklarıyla eklenmiş Bi-2212 seramiğindeki kristal kalitesi, faz bileşimleri, süperiletken özellikler ve çivileme kuvvetindeki dikkate değer değişimlerle ilgilidir. XRD analizi, Co3O4-içeriği XRD piklerinde genişlemeye, kristal kalitesinin düşmesine ve Bi-2212 miktarının azalmasına yol açtığı sonucuna varır. SEM'den Co3O4 ilavesiyle çubuksu yapıdan plakamsı yapıya doğru bir evrilme olduğu görülmektedir. Kritik geçiş sıcaklığı (Tc), M-T ölçümlerinden saf örnekte 82 K olarak bulunmuş ve 0.5% Co örneğinde 65 K’ye 1% Co örneğinde 42 K’ye kademeli olarak düştükten sonra süperiletkenlik 2% Co örneğinde kaybolmuştur. M-H ölçümlerinden, histerezis eğrilerinin Co3O4 eklenmesi ve sıcaklıkla birlikte daraldığı görülmektedir. Buna bağlı olarak, kritik akım yoğunlukları (Jc) ve çivileme kuvvetleri (Fp), Co3O4 içeriğindeki artışın neden olduğu süper iletken tanecikler arasındaki bağlantıdaki bozulmalar nedeniyle azalmıştır.

Keywords:

Yüksek sıcaklık süperiletkenleri, XRD, SEM, Manyetik Histerezis, Kritik akım yoğunluğu.,

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