The effects of annealing temperature on the in-field Jc and surface pinning in silicone oil doped MgB2 bulks and wires

Hossain, Md. Shahriar A.; Motaman, Ashkan; Çiçek, Özlem; Ağıl, Hasan; Ertekin, Ercan; Gençer, A.; Wang, Xiaolin; Dou, Shi Xue

doi:10.1016/j.cryogenics.2012.05.011

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…Co-doping with nano-Ho 2 O 3 results in the formation of HoB 4 in these samples which improves the flux-pinning properties and hence improves the Jc-B behaviour of naphthalene doped sample further to that of pure sample (MBN0H0). We have compared the J C values obtained in the present case with the recent reports by Yang et al, 31 Silva et al, 32 Hossain et al, 33 Sudesh et al, 34 Barua et al, 35 and Rahul et al 36 The results show that the obtained J C values in the present case is at par with data available in international literature.…”

Section: Resultssupporting

confidence: 76%

Doping effect of nano-Ho2O3 and naphthalene in MgB2 superconductor prepared by powder-in-sealed-tube method

Hansdah

Sarun

2015

Journal of Applied Physics

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Dependence of magnetoelectric properties on sintering temperature for nano-SiC-doped MgB2/Fe wires made by combined in situ/ex situ process J. Appl. Phys. 111, 07E135 (2012); 10.1063/1.3677660Effect of thermal strain on Jc and Tc in high density nano-SiC doped MgB2Effect of combined addition of nano-SiC and nano-Ho 2 O 3 on the in-field critical current density of MgB 2 superconductorThe effect on crystal structure, critical temperature (T C ), and critical current density (J C ) of bulk MgB 2 doped with nano-Ho 2 O 3 and naphthalene was studied. Among all the samples studied, the sample doped with 2.5 wt. % nano-Ho 2 O 3 have shown the best field dependent critical current density [J C (H)], i.e., 0.77 Â 10 5 A/cm 2 at 2 T and 10 K. While naphthalene doped MgB 2 sample has shown the least J C (H) characteristics. The improved J C (H) characteristics in the nano-Ho 2 O 3 doped MgB 2 samples are attributed to improved flux pinning properties due to the formation of HoB 4 and in naphthalene doped MgB 2 samples. The slight lower T C value (37.01 K) in naphthalene doped samples is attributed to the occurrence of lattice defect by the substitution of carbon at boron site of MgB 2 superconductor. Lower DT C value implies the lesser anisotropy in all the synthesized samples. The flux pinning force density (F P /F Pmax ) curves are theoretically analyzed using Dew-Hughes model. The result revealed that point pinning is the dominant pinning mechanism for nano-Ho 2 O 3 doped MgB 2 samples, while, surface and grain boundary pinning become dominant with increasing naphthalene addition in nano-Ho 2 O 3 doped MgB 2 samples. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Resultssupporting

confidence: 76%

Doping effect of nano-Ho2O3 and naphthalene in MgB2 superconductor prepared by powder-in-sealed-tube method

Hansdah

Sarun

2015

Journal of Applied Physics

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“…The electron scattering due to phonon contribution, as well as intra-granular defects, decreases as the superconducting critical temperature is approached. Hence, intra-granular defects due to dopants incorporation significantly contribute to the resistivity of MgB 2 superconductor close to the critical temperature [14]. Similarly, the sample crystallinity and the extent of MgB 2 inter-grain connectivity are reflected by the values of room temperature resistivity (RTR) and resistivity residual ratio (RRR) [15].…”

Section: Introductionmentioning

confidence: 99%

Extreme Learning Machine Approach to Modeling the Superconducting Critical Temperature of Doped MgB2 Superconductor

Olatunji

Owolabi

2022

Crystals

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Magnesium diboride (MgB2) superconductor combines many unique features such as transparency of its grain boundaries to super-current flow, large coherence length, absence of weak links and small anisotropy. Doping is one of the mechanisms for enhancing these features, as well as the superconducting critical temperature, of the compound. During the process of doping, the MgB2 superconductor structural lattice is often distorted while the room temperature resistivity, as well as residual resistivity ratio, contributes to the impurity scattering in the lattice of doped samples. This work develops three extreme learning machine (ELM)-based empirical models for determining MgB2 superconducting critical temperature (TC) using structural distortion as contained in lattice parameters (LP) of doped superconductor, room temperature resistivity (RTR) and residual resistivity ratio (RRR) as descriptors. The developed models are compared with nine different existing models in the literature using different performance metrics and show superior performance over the existing models. The developed SINE-ELM-RTR model performs better than Intikhab et.al (2021)_linear model, Intikhab et.al (2021)_Exponential model, Intikhab et.al (2021)_Quadratic model, HGA-SVR-RRR(2021) model and HGA-SVR-CLD(2021) model with a performance improvement of 32.67%, 29.56%, 20.04%, 8.82% and 13.51%, respectively, on the basis of the coefficient of correlation. The established empirical relationships in this contribution will be of immense significance for quick estimation of the influence of dopants on superconducting transition temperature of MgB2 superconductor without the need for sophisticated equipment while preserving the experimental precision.

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Chemically and Mechanically Engineered Flux Pinning for Enhanced Electromagnetic Properties of MgB2

Chen

Maeda

Yamamoto

et al. 2017

Vortices and Nanostructured Superconductors

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Tuning electronic-and nanostructure is the critical issue for engineering MgB2 superconductor toward applications. In this chapter, we introduce a variety of chemical and microstructural control techniques that have been developed to artificially enhance flux pinning strength in the material. The influence of chemical additives and oxygen doping on the formation of nanoprecipitates and superconducting properties is reviewed in Sect. 3.1. Carbon doping effects and methods of introducing carbon using different sources are summarized in Sect. 3.2. Microstructural control via ball milling and mechanical alloying techniques is given in Sect. 3.3.

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The effects of annealing temperature on the in-field Jc and surface pinning in silicone oil doped MgB2 bulks and wires

Cited by 8 publications

References 25 publications

Doping effect of nano-Ho2O3 and naphthalene in MgB2 superconductor prepared by powder-in-sealed-tube method

Doping effect of nano-Ho2O3 and naphthalene in MgB2 superconductor prepared by powder-in-sealed-tube method

Extreme Learning Machine Approach to Modeling the Superconducting Critical Temperature of Doped MgB2 Superconductor

Chemically and Mechanically Engineered Flux Pinning for Enhanced Electromagnetic Properties of MgB2

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