Investigation of ball milling effect on superconducting properties of oleic acid added bulk MgB2 superconductors produced by two different methods

Year 2022, Volume: 12 Issue: 3, 936 - 950, 15.07.2022

Özge Erdem

https://doi.org/10.17714/gumusfenbil.1113019

Abstract

The effect of ball milling on the microstructure and some superconducting parameters such as flux pinning force (Fp) and critical current density (Jc) of the oleic acid (C18H34O2) added MgB2 bulk samples produced by two different methods, was analysed in this article. In the first method, ball milling was applied to the samples produced by using boron (B) powders coated with carbon (C) released from oleic acid. In the second method, oleic acid was mixed with magnesium (Mg) and B powders at the same time and then the same ball milling process used in the first method was applied to the powder mixture. The structural, magnetic and electrical properties of the produced samples were analysed. The results showed that ball milling process enhances the homogeneity of the structure, decreases the grain size and improves the grain connectivity of MgB2. Also, C substitution into MgB2 lattice resulting in an increase in electron scattering and disorders, enhances after ball milling process. It supplies a significant increase in Jc at high fields and causes a slightly decrease in transition temperature (Tc), especially for the samples produced by using the first method. Because the first method supports the ball milling effect on the homogenous dispersion of oleic acid addition in the MgB2 structure and the C entrance to MgB2 lattice, acting as pinning centres, the best Jc and Fp values at high fields was obtained for the produced samples with second method.

Keywords

Ball milling, Bulk superconductors, MgB2, Oleic acid

Supporting Institution

The Scientific Research Project Coordination of Bayburt University

Project Number

project number 2019/02-69001-02

Thanks

The author would like to thank Tayfur Kucukomeroglu for his kind technical assistance. The Scientific Research Project Coordination of Bayburt University supported this study with project number 2019/02-69001-02. The samples were made at the Karadeniz Technical University in Trabzon, Turkey.

İki farklı metot ile üretilen oleik asit katkılı külçe MgB2 süperiletkenlerin süperiletkenlik özellikleri üzerine bilyeli öğütme etkisinin araştırılması

Abstract

Bu makalede, iki farklı yöntem kullanılarak üretilen oleik asit (C18H34O2) katkılı MgB2 külçe örneklerin mikroyapı ile akı çivileme kuvveti (Fp) ve kritik akım yoğunluğu (Jc) gibi bazı süperiletkenlik parametreleri üzerine bilyalı öğütmenin etkisi incelenmiştir. Birinci yöntemde, oleik asitten salınan karbon (C) ile kaplanmış bor (B) tozları kullanılarak üretilen numunelere bilyalı öğütme uygulanmıştır. İkinci yöntemde oleik asit, magnezyum (Mg) ve B tozları ile aynı anda karıştırılmış ve daha sonra toz karışıma birinci yöntemde kullanılan aynı bilyalı öğütme işlemi uygulanmıştır. Üretilen numunelerin yapısal, manyetik ve elektriksel özellikleri analiz edilmiştir. Sonuçlar, bilyalı öğütme işleminin yapının homojenliğini arttırdığını, tane boyutunu küçülttüğünü ve MgB2'nin tane bağlantısını iyileştirdiğini göstermiştir. Ayrıca, bilyalı öğütme sonrası elektron saçılması ve düzensizlikte artışa neden olan MgB2 örgüsüne C yerleşimi artar. Bu durum, özellikle birinci yöntemle üretilen numunelerde yüksek alanlarda Jc'de önemli bir artış sağlar ve geçiş sıcaklığında (Tc) küçük bir azalmaya neden olur. Birinci yöntem, bilyalı öğütmenin oleik asit katkısının MgB2 yapısına homojen dağılımı ve çivileme merkezleri görevi gören MgB2 örgüsüne C girişi üzerindeki etkisini desteklediğinden, yüksek alanlarda en iyi Jc ve Fp değerleri ikinci yöntemle üretilen örnekler için elde edilmiştir.

Keywords

Bilyalı öğütme, Külçe süperiletkenler, MgB2, Oleik asit

Project Number

project number 2019/02-69001-02

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