Nano-Y2O3 Katkılı Bizmut Esaslı Süperiletken Malzemelerin Manyetik ve Mekanik Özelliklerinin İncelenmesi

Öz

Bu çalışmada nano-Y2O3 ilavesinin Bi-2223 süperiletken sisteminin yapısal, süperiletken, manyetik ve mekanik özellikleri üzerindeki etkileri araştırılmıştır. Bi1.8Pb0.4Sr2Ca 2Cu3O10 + δ + (Y2O3) ile ( x; ağırlıkça % 0,0-0,2-0,4-0,8-1,0) genel formülüne sahip polikristal örnekler katıhal reaksiyon yöntemiyle hazırlandı. Örneklerin yapısal karakterizasyonları için X-ışını kırınımı (XRD), Taramalı Elektron mikroskobu (SEM), Enerji dağılımlı X-ışını spektroskopisi (EDX) ölçümü, Titreşimli numune ölçümü (VSM), Direnç-sıcaklık (ρ-T) ölçümü ve Vickers mikrosertlik ölçümü (VHM) yapılmıştır. XRD desenleri, örneklerde hem Bi -2223 hem de Bi2212 fazlarının bir arada bulunduğunu gösterdi. Nano-Y ilavesinin artmasıyla a örgü parametresi artarken, c örgü parametresi azalmıştır. SEM fotoğraflarında tüm örneklerde tanecik yapısının plaka benzeri olduğu görülmekte ve katkı miktarındaki artmasıyla tabakalı yapı üzerinde nokta şeklinde partiküllerin varlığı daha net görülmektedir. ρ-T ölçümünden hesaplanan delik konsantrasyonu değerleri 0,113 ile 0,160 arasında değişmektedir. Nano-Y miktarı artarken kritik geçiş sıcaklıkları azalmıştır. VSM sonuçları Nano-Y eklenmesiyle kritik akım yoğunluğu değerlerinin arttığını göstermektedir. VHM sonuçları, sertlik değerinin x= % 0,4 katkılı örneğe kadar arttığını ve bu değerden sonra azaldığını göstermiştir.

Anahtar Kelimeler

• nano- Y2O3
• BSSCO
• Critical Current Density
• Hole concentration
• Microhardness

Investigation of the Magnetic and Mechanical Properties of Nano-Y2O3 Doped Bismuth Based Superconductor Materials

Öz

The effects of nano-Y2O3 addition on the structural, superconducting, magnetic and mechanical properties of Bi-2223 superconducting system were investigated in this study. Bulk polycrystalline samples with general formula of Bi1.8Pb0.4Sr2Ca 2Cu3O10 + δ + (Y2O3) with ( x; weighted % 0.0-0.2-0.4-0.8-1.0) were prepared by solid state reaction method. X-ray diffraction (XRD), Scanning Electron microscope (SEM), Energy dispersive X-ray spectroscopy (EDX) mesurement, Vibrating sample mesurement (VSM), Resistance- temperature (ρ-T) mesurement and Vickers microhardness mesurement (VHM) were also used for samples structural characterizations. XRD patterns showed that both Bi -2223 and Bi-2212 phases are coexist in the samples. While a lattice parameter increased, c lattice parameter decreased with increasing of nano-Y addition. In SEM photographs, it is seen that granular structure is plate-like in all samples and increase in the amount of additive, presence of point particles on the layered particles is seen more clearly. Hole concentration values that calculated from ρ-T mesurement, ranges from 0.113 to 0.160. While amount of nano-Y increased, critical transition temperatures decreased. VSM results showed that critical current density values increase with the addition of Nano-Y. VHM results showed that the hardness value increased until x= 0.4% additive sample and decreased after this value.

Anahtar Kelimeler

• nano- Y2O3
• BSSCO
• Critical Current Density
• Hole concentration
• Microhardness

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