Role of diffusion-annealing temperature on the microstructural and superconducting properties of Cu-doped MgB2 superconductors

Doğruer, M.; Yıldırım, G.; Yücel, Ersin; Terzioğlu, C.

doi:10.1007/s10854-012-0689-6

Cited by 19 publications

(3 citation statements)

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“…It is reported in literature, there are several methods to calculate the diffusion coefficient in a polycrystalline high-T c superconductor [43][44][45]. Namely, successive removal of thin layers and (1) the measurement of lattice parameter c from the XRD patterns obtained, (2) the measurement of the samples resistivity, (3) the radio tracer and (4) the EDXRF technique are the most common four methods.…”

Section: Calculation Of Diffusion Coefficient and Activation Energymentioning

confidence: 99%

Effect of zirconium diffusion on the microstructural and superconducting properties of YBa2Cu3O7−δ superconductors

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Görür

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et al. 2012

Journal of Alloys and Compounds

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Section: Calculation Of Diffusion Coefficient and Activation Energymentioning

confidence: 99%

Effect of zirconium diffusion on the microstructural and superconducting properties of YBa2Cu3O7−δ superconductors

Güner

Görür

Çelık

et al. 2012

Journal of Alloys and Compounds

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“…According to the broadening nature of the XRD peaks of the ceramic, the particle size can be determined from the Scherrer-Warren equation [31][32][33][34].…”

Section: Grain Size Calculationmentioning

confidence: 99%

Investigation of microstructural, Vickers microhardness and superconducting properties of YBa2Cu3−xGdxO7−δ (0 ≤ x ≤ 0.150) superconducting ceramics via experimental and theoretical approaches

Doğruer

Öztürk

Varılcı

et al. 2012

J Mater Sci: Mater Electron

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This study manifests the change of pinning mechanism, electrical, structural, physical, mechanical and superconducting properties of YBa 2 Cu 3-x Gd x O 7-d superconductors samples prepared by the conventional solidstate reaction method (x = 0, 0.025, 0.050, 0.100 and 0.150) by use of dc resistivity, X-ray analysis (XRD), scanning electron microscopy (SEM) and Vickers microhardness measurements. Zero resistivity transition temperatures (T c offset ) of the samples are deduced from the dc resistivity measurements. Additionally, the lattice parameters are determined from XRD measurements when the microstructure, surface morphology and microhardness of the samples studied are examined by SEM and mechanical measurements, respectively. The results obtained demonstrate that T c offset values of the samples decrease slowly with the increase in the Gd content. The maximum T c offset (92.0 K) is obtained for the pure sample prepared at 940°C for 20 h in air atmosphere while the minimum value of 83.3 K is found for the sample doped with 0.150 Gd content. Moreover, it is obtained that J c values reduce from 132 to 34 A/cm 2 with the enhancement of the Gd level in the crystalline structure. Further, the peak intensities belonging to Y123 (major) phase are obtained to decrease whereas the peak intensities of the minor phases such as BaCuO 2 and Y211 are found to enhance systematically with the increment in the Gd content in the system, illustrating that partial substitution of Cu 2? ions by Gd 3? ions are carried out successfully. Moreover, SEM images display that the undoped sample obtains the best crystallinity and connectivity between superconducting grains and largest grain size whereas the worst surface morphology is observed for the maximum doped sample (x = 0.150). At the same time, Vickers microhardness, elastic modulus, load independent hardness, yield strength, fracture toughness and brittleness index values, playing important roles on the mechanical properties, are computed for all the samples. The experimental results of the microhardness measurements are examined using the Meyer's law, PSR (proportional specimen resistance), modified PRS, ElasticPlastic deformation model (EPD) and Hays-Kendall (HK) approach. The microhardness values obtained increase with the enhancement of the Gd content in the samples. Besides, it is noted that the Hays-Kendall approach is the most successful model explaining the mechanical properties of the samples studied in this work.

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“…Bununla birlikte MgB 2 süperiletkenin izotop etkisi ölçümlerine göre elektronlar arasındaki etkileşimin atom titreşimlerinden oluştuğu, genelde 11 B şeklinde bulunan bor atomlarının 10 Süperiletken malzeme hazırlama tekniklerinden olan ex-situ ve in-situ yöntemleri, malzemenin mikro ve makro yapısal özelliklerini, mekanik davranışlarını ve süperiletkenlik özelliklerini araştırma yönüyle oldukça sık tercih edilen yöntemlerdir [11,12]. Bu yöntemlerin yanı sıra MgB 2 malzemesine fiziksel, elektriksel ve manyetik özelliklerini iyileştirmek için yapılan katkılamalar [13][14][15][16][17], kaplamalar [18][19][20], birbirinin yerine geçme (yer değiştirme), Mg ya da B miktarlarındaki oran farklılığı vb. gibi çalışmalar mevcuttur [21,22].…”

Section: Introductionunclassified

MgB2 süperiletken külçe malzemesine altın kaplamasının etkileri

Ülgen¹

2017

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Magnezyum diborür (MgB 2) süperiletken külçe malzemeleri argon atmosferinde ex-situ (hazır toz) ve in-situ (Mg+2B) katıhal reaksiyon yöntemiyle hazırlanmıştır. Ex-situ/in-situ MgB 2 süperiletken örneklerin bir yüzeyine ~50 µm altın (Au) kalın film kaplaması yapılmıştır. Bir yüzeyi Au kaplı ex-situ/in-situ MgB 2 süperiletken örnekler 650 o C-850 o C sıcaklık aralığın da 1 saat tavlanmıştır. Bu malzemelerin X-Işını Kırınım (XRD) yöntemi kullanılarak mikro yapısal değişimi ve direnç-sıcaklık ölçümleri (R-T) ile elektriksel karakteristiği incelenmiştir. Au kaplamasıyla MgB 2 malzemesinin c örgü parametresi ve özkütlesinin arttığı gözlenmiş, aynı zamanda bazı tavlama sıcaklığında kritik geçiş sıcaklığı (T c) iyileşme göstermiştir.

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Role of diffusion-annealing temperature on the microstructural and superconducting properties of Cu-doped MgB2 superconductors

Cited by 19 publications

References 25 publications

Effect of zirconium diffusion on the microstructural and superconducting properties of YBa2Cu3O7−δ superconductors

Effect of zirconium diffusion on the microstructural and superconducting properties of YBa2Cu3O7−δ superconductors

Investigation of microstructural, Vickers microhardness and superconducting properties of YBa2Cu3−xGdxO7−δ (0 ≤ x ≤ 0.150) superconducting ceramics via experimental and theoretical approaches

MgB2 süperiletken külçe malzemesine altın kaplamasının etkileri

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