Development of Diamagnetic Properties of Bi-2212 Superconductors with Different Amounts of Nano-Sized Zn Substituted in Strontium Sites

Öz

This study investigated the effect of substituting nano-sized zinc (Zn) (<100 nm) for strontium in Bi-2212 superconducting ceramics. Ceramic superconductor samples with initial compositions of Bi2Sr2-xZnxCa1Cu2Oy (x = 0,00; 0,0125; 0,0250; 0,050; 0,075 and 0,1) were produced using the solid-state reaction method. Substituting nano-sized zinc particles for strontium sites in Bi-2212 superconductors is a novel research study that has never been attempted before. Despite the occurrence of secondary phases, X-ray phase studies revealed that the Bi-2212 superconducting phase was the main phase in all samples. All of the samples had plate-like grains, which are a defining characteristic of the Bi-2212 superconductor structure, according to the morphological structure analyes. Differences in grain behavior were detected with the substituting of Zn nanoparticles. The sample with nano-sized Zn at x = 0,1 has more larger, plate-like grains in comparison with the other samples. As a result of resistivity temperature measurements of ceramic samples, it was observed that all samples exhibited metallic behavior above the onset temperature. Compared to other samples, the sample containing Zn substituting at x = 0.1 has the highest superconductivity transition temperature due to the formation of large-sized grains and the development of superconducting phases. All samples exhibited closed-loop hysteresis behavior, which is a feature of Bi-2212 superconductor materials, according to the magnetization measurements. The highest hysteresis field occurred in the sample with x = 0,1 substitution, suggesting the development of diamagnetic characteristics. Bean's critical current density model was applied to theoretically calculate the current density (Jc) values of the superconducting samples. In the sample containing nano-sized Zn at x = 0,1, a Jc value of 65.55 X 105 A/cm2 was obtained as a result of the improvement in morphological structure and flux pinning performance.

Anahtar Kelimeler

• Bi2Sr2-xZnxCa1Cu2Oy
• Zn Nanoparticle
• M-H

Stronsiyum Sitelere Farklı Oranda Nano Boyutta Zn Katkılı Bi-2212 Süperiletkenlerin Diamanyetik Özelliklerinde Gelişim

Öz

Sunulan çalışmada, Bi-2212 süperiletken seramiklerde stronsiyum bölgelere nano boyutta Zn (<100 nm) katkısının etkisi araştırılmıştır. Bi2Sr2-xZnxCa1Cu2Oy (x = 0,00; 0,0125; 0,0250; 0,050; 0,075 ve 0,1) başlangıç kompozisyonunda seramik süperiletken örnekler katı hal tepkime yöntemi ile üretildi. Bi-2212 süperiletkenlere nano boyutta Zn parçacıklarının stronsiyum sitelere katkısı daha önce denenmemiş özgün araştırmadır. X-ışını ile gerçekleştirilen faz analizlerinde, ikincil fazların oluşumuna rağmen tüm örneklerde Bi-2212 süperiletken fazının temel faz olduğu tespit edildi. Morfolojik yapı analizlerinde tüm örneklerde Bi-2212 süperiletken fazının karakteristik özelliği olan plaka benzeri tanelerin varlığı gözlemlendi. Stronsiyum sitelere nano boyutta Zn parçacıkların katkılanması ile tane davranışlarında farklılaşmalar tespit edildi. Diğer örnekler ile karşılaştırıldığında, x = 0,1 oranında nano boyutta Zn içeren örnek daha geniş ebatta plaka benzeri tanelerden oluşmaktadır. Seramik örneklerin özdirenç sıcaklık ölçümleri sonucunda, tüm örneklerde onset sıcaklığı üzerinde metalik davranış gözlemlendi. Diğer örnekler ile karşılaştırıldığında geniş ebatta tanelerin oluşumu ve süperiletken fazların gelişimi ile x = 0,1 oranında Zn katkısı içeren örnek en yüksek süperiletkenlik geçiş sıcaklığına shaiptir. Manyetizasyon ölçümü sonuçlarında, tüm örneklerde Bi-2212 süperiletken malzemelerin karakteristik davranışı olan kapalı döngü histerezis davranışı gözlemlendi. Diamanyetik özelliklerin geliştiğinin göstergesi olarak en geniş histerezis alanı x = 0,1 katkılı örnekte gözlemlenmiştir. Süperiletken örneklerin akım yoğunluğu (Jc) değerleri Bean’s kritik akım yoğunluğu modelinden teoriksel olarak hesaplanmıştır. x = 0,1 oranında nano boyutta Zn içeren örnekte, morfolojik yapıda ve akı çivileme performanslarının gelişmesi sonucu 65,55 X 105 A/cm2 Jc değeri elde edildi.

Anahtar Kelimeler

• Bi2Sr2-xZnxCa1Cu2Oy
• Zn Nanoparçacık
• M-H
• Jc

Kaynakça

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