Thermopower of NiO/(Bi, Pb)-2223 composite

Rahal, H. T.; Awad, R.; Abdel‐Gaber, A. M.

doi:10.1088/1742-6596/869/1/012026

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…X-ray diffraction patterns and scanning electron microscopy (SEM) images reveal that NiO nanoparticles did not participate in the crystal structure of (Bi, Pb)-2223 phase. They only filled the inter-grain voids found in the superconductor matrix and thus increased the grain connectivity (Rahal et al, 2017a). Figure 2 shows the potentiodynamic polarization curves of (NiO) x (Bi, Pb)-2223 phase superconductor (x = 0.05 Wt.%) at different aging times.…”

Section: Resultsmentioning

confidence: 99%

“…Although (Bi, Pb)-2223 has been known to be the most stable high-superconducting compound, it still suffers from high brittleness and low ductility, resulting in limited usage of this phase material (Cevizci et al, 2016). The incorporation of nanooxides such as NiO, Al 2 O 3 , Zr 2 O 3 , Fe 2 O 3 and SnO 2 into the superconductors is one of the most efficient methods in enhancing their electrical, superconducting and mechanical properties (Rahal et al, 2017a;Awad et al, 2012;Albiss et al, 2010). On the other side, investigating the superconductor's chemical properties is also significant because of their impact on the durability of such ceramic materials in various environments, for example, corrosion resistance and weathering of superconductors, which determine their suitability in various potential applications.…”

Section: Introductionmentioning

confidence: 99%

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Influence of nitrogen immersion and NiO nanoparticles on the electrochemical behavior of (Bi, Pb)-2223 superconductor in sodium sulfate solution

Rahal

Abdel‐Gaber

Awad

et al. 2018

ACMM

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Purpose The paper aims to examine the inhibition effect of NiO nanoparticles and the influence of liquid nitrogen immersion on the corrosion behavior of (NiO)x(Bi1.6 Pb0.4)Sr2Ca2Cu3O10-δ and (NiO)x (Bi, Pb 2223), where x = 0.00 and 0.05 Wt.% phase superconductor in 0.1 M Na2SO4 at 30°C. Design/methodology/approach This study was done using open-circuit potential electrochemical impedance spectroscopy, potentiodynamic polarization curves and chronoamperometry measurements. Findings Potentiodynamic polarization technique showed that NiO nanoparticles suppress both the anodic and cathodic parts of the polarization curves of (NiO)x(Bi, Pb)-2223 superconductor in 0.1 M Na2SO4 solution. A significant enhancement in the corrosion resistance of the prepared superconductors is observed on immersing them in liquid nitrogen. This is owing to the fact that immersion in liquid nitrogen increases the volume contraction of the superconductor matrix, causing the shrinkage of the pores and voids present in the samples and thus reducing the active surface area for the dissolution of (NiO)x(Bi, Pb)-2223 superconductor matrix. Originality/value This paper fulfills the need to investigate the corrosion behavior of superconductors and the influence of liquid nitrogen immersion on such behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of nitrogen immersion and NiO nanoparticles on the electrochemical behavior of (Bi, Pb)-2223 superconductor in sodium sulfate solution

Rahal

Abdel‐Gaber

Awad

et al. 2018

ACMM

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“…Electrochemical impedance (EIS) and polarization measurements were achieved using ACM 1709 potentiostat provided from ACM instruments (UK). The used cell setup and conditions were comparable to that described previously, in which a saturated calomel electrode (SCE) was used as the reference electrode and a platinum electrode as the auxiliary electrode [19]. The working electrode consists of the prepared superconductor pellets free from and containing different percentages of Mn 2 O 3 of area 1.893 cm 2 .…”

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confidence: 99%

Corrosion Behavior of Mn2O3 Nanoparticles Doped Samarium Superconductor in 0.5 M HCl

Najjar¹,

Abdel‐Gaber²,

Awad³

2019

JNMES

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High performance single-domain (RE)Ba 2 Cu 3 O 7-δ where RE denoted rare earth element, such as Gd, Nd, Sm, Eu , Y, etc., have received technological and scientific attention since it is used for a wide range of large-scale utilization such as wind turbines, magnetic separation devices for water purification, in transportation as well as in power transmission [1]. Some applications of these new materials will be critically dependent on their stability in hostile aqueous environments which can limit their use in different environments, specifically in humid media [2]. Gao et al. [3] studied the effect of rare earth elements on the structure and electrochemical properties of La 0.63 R 0.2 Mg 0.17 Ni 3.1 Co 0.3 Al 0.1 alloy electrodes. They found that the substitution of La with Ce, Pr and Gd increases the electrochemical capacity and greatly improves hydrogen diffusion rate in the bulk as well as the charge transfer rate at the surface, and hence increase the rate of discharge-ability. Considerable research effort has been focused on the corrosion resistance of ceramic materials and composite oxides to determine the suitable conditions for different potential applications of these materials and find the protective measures in a corrosive medium. One of the functional methods to enhance the corrosion resistance of these materials is the addition of nanoparticles that became much attractive due to their effect on the microstructure., Singh et al. investigated the Mn-substitution in Mn x Fe 3-x O 4 (0 ≤ x ≤ 1.5) [4]. It was found that Mn improves significantly the electrocatalytic activity of this material specifically with 0.5 mol Mn-substitution. In addition, the deposition of MnO 2 on carbon nanotube (CNT) /Al show that this composite electrode was characterized by its capacitive behavior, displaying a much higher capacitance compared to MnO 2 / Ni electrodes [5]. Furthermore, Wang et al. [6] showed that the LiNi 0.5 Mn 1.5 O 4 cathode material shows the optimal overall electrochemical performance in view of the relatively lower discharge capacity at all rates. Nichelson et al. proved that a maximum ionic conductivity of 10 -6 S/cm at ambi-

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A comparative study on the influence of the addition of different nano-oxide particles on the thermopower of (Bi,Pb)-2223 superconductor

et al. 2019

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Thermopower of NiO/(Bi, Pb)-2223 composite

Cited by 5 publications

References 13 publications

Influence of nitrogen immersion and NiO nanoparticles on the electrochemical behavior of (Bi, Pb)-2223 superconductor in sodium sulfate solution

Influence of nitrogen immersion and NiO nanoparticles on the electrochemical behavior of (Bi, Pb)-2223 superconductor in sodium sulfate solution

Corrosion Behavior of Mn2O3 Nanoparticles Doped Samarium Superconductor in 0.5 M HCl

A comparative study on the influence of the addition of different nano-oxide particles on the thermopower of (Bi,Pb)-2223 superconductor

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