Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

Abdeen, W.; Marahba, S.; Awad, R.; Aly, A. I. Abou; Ibrahim, I. H.; Matar, M.

doi:10.1007/s40145-015-0173-x

Cited by 39 publications

(7 citation statements)

References 83 publications

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“…One of the most practical technique for enhancing the microhardness of superconducting phases is the filling of voids by addition/substitution of nanoparticles. (Karara, Uzun, Kolemen, Yilmaz, & Sahin 2009) (Abdeen, et al, 2016) (Awad, 2008) (Mohammed, Abou Aly, Ibrahim, Awad , & Rekaby, 2011) (Aydin, Cakiroglu, Nursoy, & Terzioglu, 2009) (Terzioglu, 2011). The introducing of ZnO in Bi 1.84 Pb 0.34 Sr 1.91 Ca 2.03 Cu 3.06 O 10 superconductors increased the indentation hardness and the elastic modulus values as observed by Karaca et al (Karaca, Uzun, Kolemen, Yilmaz, & Sahin, 2009).…”

Section: Introductionmentioning

confidence: 78%

“…The introducing of ZnO in Bi 1.84 Pb 0.34 Sr 1.91 Ca 2.03 Cu 3.06 O 10 superconductors increased the indentation hardness and the elastic modulus values as observed by Karaca et al (Karaca, Uzun, Kolemen, Yilmaz, & Sahin, 2009). Abdeen et al (Abdeen et al, 2016) showed that the substitution of 0.025 of holmium increased the Vickers microhardness of (Bi,Pb)-2223 superconducting phase and it had a normal indentation behavior. Awad (Awad, 2008) found that 0.6 wt% of MgO addition enhanced Vickers microhardness of (Cu 0.25 Tl 0.75 )-1234.…”

Section: Introductionmentioning

confidence: 99%

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Effect of BaFe12O19 Nanoparticles Addition on (Bi,Pb)-2223 Superconducting Phase

Habanjar¹,

Hassan²,

Awad³

2019

MAS

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The aim of this work is to investigate the effect of BaFe12O19 nanoparticles on the microstructure, phase formation and mechanical properties of (Bi,Pb)-2223 superconducting phase. Co-precipitation and solid-state reaction techniques were used to synthesize BaFe12O19 nanoparticles and (BaFe12O19)x(Bi,Pb)-2223 superconducting samples with , respectively. BaFe12O19 nanoparticles and (BaFe12O19)x(Bi,Pb)-2223 structures were performed using X-ray diffraction. The morphology of BaFe12O19 nanoparticles and (BaFe12O19)x(Bi,Pb)-2223 were observed by means of transmission electron microscope (TEM) and scanning electron microscope (SEM), respectively. The experimental results reveal the composition of Bi-2223 phase and traces of Bi-2212 as a secondary phase when compared to the undadded sample. Lattice parameters are not altered with BaFe12O19 addition which indicate that nanoparticles do not enter the host crystal of (Bi,Pb)-2223. Vickers microhardness Hv is measured as function of indentation load and time. It was found that microhardness has a non-linear trend with applied load and time. The experimental results were analyzed using different models. The analysis revealed that the HK model was more suitable than the other approaches in estimating the load independent hardness of the samples.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Effect of BaFe12O19 Nanoparticles Addition on (Bi,Pb)-2223 Superconducting Phase

Habanjar¹,

Hassan²,

Awad³

2019

MAS

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“…In this section, we focused on the variation of the porosity degree (porosity) concerning the elastic modulus of calcium oxide added Bi-2212 samples prepared under applied test forces for determining the role of applied test loads on the porosity degree that is responsible for potential engineering and industrial applications of ceramic compounds [18]. On this basis, we investigated the role of calcium oxide particles addition and applied test forces on the elastic modulus of the bulk Bi-2212 ceramic structure using the granularity degree (porosity) deduced from the Vickers microindentation hardness tests [19]. The relationship between the Young's modulus and porosity is utilized to determine the relative degrees of porosity for pure and Ca added Bi-2212 ceramics as given below [19]:…”

Section: Role Of Calcium Oxide Impurity In Elastic Modulus For Bi-221...mentioning

confidence: 99%

“…On this basis, we investigated the role of calcium oxide particles addition and applied test forces on the elastic modulus of the bulk Bi-2212 ceramic structure using the granularity degree (porosity) deduced from the Vickers microindentation hardness tests [19]. The relationship between the Young's modulus and porosity is utilized to determine the relative degrees of porosity for pure and Ca added Bi-2212 ceramics as given below [19]:…”

Section: Role Of Calcium Oxide Impurity In Elastic Modulus For Bi-221...mentioning

confidence: 99%

Dependence of General Mechanical Properties of Bi-2212 Ceramics on Calcium Oxide

2023

International Conference on Innovative Academic Studies

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In this study, we investigated the role of calcium oxide (CaO) impurity addition and applied micro-indentation test loads on some mechanical performance parameters including elastic moduli (E), shear (G) modulus and resilience (Ur) of Bi2.1Sr2.0Ca1.1Cu2.0Oy ceramics using Vickers hardness test measurements. The tests were conducted in test forces ranges from 0.245 N to 2.940 N. Additionally, experimental findings reveal the relationship between Vickers results and test forces applied, and specifically identify the impact of Ca ion impurity on the elastic modulus for Bi-2212 ceramics. All experimental findings indicated a strong dependence of the examined mechanical performance quantities on both the loads applied and the amount of calcium oxide impurity addition. As the level of calcium impurity addition increased in bulk Bi-2212 ceramic compounds, it was noted that mechanical performances are systematically deteriorated due to an increase in microvoids, strains, prevalent defects, bonding problems, and crystallinity faults based on interaction between adjacent layers of ceramics. Furthermore, increasing the applied test force damaged the mechanical performances of Bi-2212 ceramics due to their granular structure. Thus, it was indicated that the pure sample has the best crystal quality while the Bi-2212 ceramic prepared with the maximum CaO addition amount of x=0.1 has the maximum crystal structure problems. In this regard, the former ceramic exhibited much stronger mechanical performance quantities compared to the other prepared ceramics. In other words, the pure ceramic material showed the least response and sensitivity to the microindentation test load. In summary, the idea of adding calcium oxide impurity fails to improve the mechanical performance, durability of the tetragonal phase, and stabilization of the Bi-2212 superconducting system.

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“…Moreover, the configuration of this phase is strongly depending on the process conditions such as sintering condition, annealing time and time of thermal processing. in this field several attempts have been made to promote the formation of the high T C phase: The accurate control of the sintering temperature and heat treatment for long periods (more than 200 hours [5][6][7], moreover synthesis atmosphere, sintering under low oxygen pressure, as well as the modification the components of a starting materials, such as, substitution for a part of Bi by combinations of Tl 0.3-x Sn x [8], part of Ca by Dy [9], part of Ca by holmium [10]. To date, an appropriate mechanism for the formation and strengthening of 2223 phase, for Bisystem as a single-phase has not yet been established.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sb2O3 and/or CdO nanoparticle substitution on the properties of high-TC superconducting Bi1.6-x SbxPb0.4Sr2Ca2-yCdyCu3OZ material

Salih¹

2018

IJP

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High temperature superconductors materials with composition Bi1.6-xSbxPb0.4Sr2Ca2-yCdyCu3OZ (x = 0, 0.1, 0.2 and 0.3) and (y = 0.01 and 0.02), were prepared by using the chemical reaction in solid-state ways, and test influence of partial replacement of Bi and Ca with Sb and Cd respectively on the superconducting properties, all samples were sintered at the same temperature (850 oC) and for the same time (195 h). The structural analysis of the prepared samples was carried out using X-ray diffraction (XRD) measurements performed at room temperature, scanning electron microscope (SEM) and dc electrical resistivity was measured as a function of temperature. It was found that the sample prepared by partial substitution of Sb at ratio (x= 0.2) and Cd with ratio (y=0.01), has the maximum value of zero resistance temperature, where was the TC(onset) and TC(0) values for this sample are (140 K) and (123 K) respectively, and XRD results reveal that this sample has the highest percentage of Bi- 2223 phase, as well as the analysis of XRD patterns of the prepared materials showed polycrystalline structure and signalize that all samples had an orthorhombic crystalline structure. It was concluded that Sb2O3 nanoparticles it may be acts as a flux agent in the matrix to lower the partial melting temperature of the samples and that leads to the promotion of the high-TC phase.

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Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

Cited by 39 publications

References 83 publications

Effect of BaFe12O19 Nanoparticles Addition on (Bi,Pb)-2223 Superconducting Phase

Effect of BaFe12O19 Nanoparticles Addition on (Bi,Pb)-2223 Superconducting Phase

Dependence of General Mechanical Properties of Bi-2212 Ceramics on Calcium Oxide

Effect of Sb2O3 and/or CdO nanoparticle substitution on the properties of high-TC superconducting Bi1.6-x SbxPb0.4Sr2Ca2-yCdyCu3OZ material

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