Kalay katkısının Ba2Ca3Cu6-xSnxOy süperiletken seramiğin manyetik kaldırma ve manyetik sertlik performansına etkisi

Yıl 2024, , 975 - 984, 15.07.2024

Şahin Ünlüer

https://doi.org/10.28948/ngumuh.1488012

Öz

Bu çalışmada, katı hal reaksiyon yöntemiyle üretilen kalay katkılı Ba2Ca3Cu6-xSnxOy (x = 0.0, 0.5, 1.0, 1.5, 2.0) nominal kompozisyona sahip yüksek sıcaklık süperiletken (HTS) seramik numunelerin, manyetik akı kapasitesi üzerinde kalay katkısının etkileri araştırıldı. Süperiletken örneklere ait manyetik kaldırma kuvvetini (MLF) ölçmek için 300 mT değerinde sabit mıknatıs (PM) kullanıldı. MLF ölçümleri sıfır alan soğutma (ZFC), alan altında soğutma (FC) koşullarında, tek boyutta, düşey uzaklığa bağlı statik ölçüm şeklinde alındı. ZFC’de Maksimum MLF değeri, Fz=63 mN ile Sn20 örneğinde ölçüldü. ZFC’de kalay katkısının, tüm örneklerde çekici kuvveti düşürüp itici kuvveti baskın hale getirmesiyle akı yakalama kapasitesini zayıflattığı görüldü. ZFC’de MLF ölçümlerinden manyetik sertlik (stiffness) hesaplanarak kalay katkısının etkisi ortaya kondu. Ayrıca FC koşulunda 3 döngü üzerinden MLF ölçümleri alındı. MLF eğrilerinin belirtilen koşullarda önemli histeretik davranış sergilediği görüldü. HTS’lerin duyarlık gösterdiği bölgenin 0-30 mm aralığı olduğu belirlendi. Döngüsel MLF ölçümlerindeki aşağı yönlü kaymalar Bean'in Kritik Durum Modeline atfedildi.

Anahtar Kelimeler

Manyetik Kaldırma, Manyetik Sertlik, BaCaCuO, Alan Altında Soğutma (FC), Alansız Soğutma (ZFC)

Proje Numarası

FEB2016/25

Teşekkür

Bu çalışma, Niğde Ömer Halisdemir Üniversitesi BAP Birimi tarafından FEB2016/25 nolu, BAGEP projesi kapsamında desteklenmiştir.

Effect of tin dopant to magnetic levitation and magnetic stiffness performance of Ba2Ca3Cu6-xSnxOy superconducting ceramics

Öz

In this study, the effects of tin doping on the magnetic flux capacity of tin-doped Ba2Ca3Cu6-xSnxOy (x = 0.0, 0.5, 1.0, 1.5, 2.0) nominal composition high temperature superconducting (HTS) ceramic samples produced by solid state reaction method were investigated. A permanent magnet (PM) of 300 mT was used to measure the magnetic levitation force (MLF) of the superconducting samples. MLF measurements were taken in zero field cooling (ZFC) and field cooling (FC) conditions as static measurements in one dimension, depending on the vertical distance. Maximum MLF value at ZFC was measured in Sn20 sample with Fz=63 mN. Tin doping in ZFC was seen to weaken the flux trapping capacity by reducing the attractive force and dominating the repulsive force in all samples. The effect of tin doping was revealed by calculating the magnetic stiffness from MLF measurements in the ZFC condition. Also, MLF measurements were taken over 3 loops in FC condition. It was observed that MLF curves exhibited significant hysteretic behavior under the specified conditions. It was determined that the region where HTSs showed sensitivity was in the 0-30 mm range. Downward shifts in the cyclic MLF measurements were attributed to Bean's Critical State Model.

Anahtar Kelimeler

Magnetic Levitation, Magnetic Stiffness, BaCaCuO, Field Cooled (FC), Zero Field Cooled (ZFC)

Proje Numarası

FEB2016/25

Kaynakça

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