Structural, electrical and mechanical properties of the (NdFeO3)x/(CuTl)-1223 superconductor phase

Makdah, Marwa H. El; Ghouch, Nour El; El-Dakdouki, Mohammad H.; Awad, R.; Matar, M.

doi:10.1007/s00339-023-06547-8

Cited by 8 publications

(5 citation statements)

References 117 publications

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“…This indicated that LaF 3 and SmF 3 had a considerable impact on enhancing the microhardness of the samples at low doping levels. This enhancement is explained by increased grain connectivity as a result of decreased porosity, which increases sample resistance to fracture propagation among grains [23], as also supported by the SEM results. On the other hand, higher Sm, La, and F contents are associated with a drop in microhardness values.…”

Section: Vickers Microhardness Measurement Examinationsupporting

confidence: 73%

“…This indicated that LaF3 and SmF3 had a considerable impact on enhancing the microhardness of the samples at low doping levels. This enhancement is explained by increased grain connectivity as a result of decreased porosity, which increases sample resistance to fracture propagation among grains [23], as Furthermore, as demonstrated in Figure 8a,b, the Vickers microhardness values of all superconducting samples vary unsystematically with La and Sm concentrations. However, for Sm and La substituted at x = 0.025, H V achieved the highest values compared to the pure sample and all substituted samples.…”

Section: Vickers Microhardness Measurement Examinationmentioning

confidence: 75%

“…The predicted n values for samarium substituted samples range from 4.2 to 9.2 and from 4.2 to 11.5 for lanthanum substituted samples. More homogeneous superconductors have higher n values [23]. Figure 7 also shows the relationship between T c and J c of the produced samples as a function of Sm and La concentration.…”

Section: Critical Current Density (J C ) Measurementsmentioning

confidence: 99%

“…These peaks dominate over any impurities or alternative superconducting phases present in the samples [22]. The existence of secondary low-intensity peaks indicates the presence of impurity phases, such as the (Tl, Hg)-1212 phase, BaHgO 2 , BaCuO 2 , and CaHgO 2 [23]. Such impurities are formed as a result of fluctuations in the partial pressure of oxygen throughout the preparation procedure [14].…”

Section: Sample Investigationmentioning

confidence: 99%

“…Li and Bradt [54] introduced this model, which is employed to identify whether materials demonstrate ISE or RISE behavior. The Vickers hardness values, both load-dependent and load-independent, for the PSR model can be calculated using the following equation [23]:…”

Section: 4 Proportional Specimen Resistance (Psr) Modelmentioning

confidence: 99%

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Superconducting and Mechanical Properties of the Tl0.8Hg0.2Ba2Ca2Cu3O9−δ Superconductor Phase Substituted by Lanthanum and Samarium Fluorides

Khattar,

Anas,

Awad

et al. 2023

Condensed Matter

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This study investigated the impact of samarium and lanthanum fluorides (SmF3 and LaF3) on the physical and mechanical properties of Tl0.8Hg0.2Ba2Ca2−xRxCu3O9−δ−yFy superconducting phases (specifically the (Tl, Hg)-1223 phase), where R = Sm and La, with 0.00 ≤ x ≤ 0.10. The superconducting samples were synthesized using the solid-state reaction method. X-ray diffraction (XRD) verified the formation of the (Tl, Hg)-1223 phase without altering its tetragonal structure. Scanning electron micrographs (SEM) reveal the improvement of the grain size and inter-grain connectivity as Sm and La contents increased up to x=0.025. The electrical properties of (Tl, Hg)-1223 were studied using I-V and electrical resistivity measurements. Improved superconducting transition temperature (Tc) and transport critical current density (Jc) were observed up to x=0.025, beyond which they decreased substantially. Vickers microhardness (Hv) measurements were performed at room temperature to investigate their mechanical performance with various applied loads (0.49–9.80 N) and times (10–90 s). For both substitutions, the mechanical properties were enhanced up to an optimal value at x=0.025. All samples exhibited normal indentation size effect (ISE) behavior. The proportional sample resistance (PSR) model best explained Hv values among five theoretical models. Dislocation creep was the primary creep mechanism in the samples, according to indentation creep studies.

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Section: Vickers Microhardness Measurement Examinationsupporting

confidence: 73%

“…This indicated that LaF3 and SmF3 had a considerable impact on enhancing the microhardness of the samples at low doping levels. This enhancement is explained by increased grain connectivity as a result of decreased porosity, which increases sample resistance to fracture propagation among grains [23], as Furthermore, as demonstrated in Figure 8a,b, the Vickers microhardness values of all superconducting samples vary unsystematically with La and Sm concentrations. However, for Sm and La substituted at x = 0.025, H V achieved the highest values compared to the pure sample and all substituted samples.…”

Section: Vickers Microhardness Measurement Examinationmentioning

confidence: 75%

Section: Critical Current Density (J C ) Measurementsmentioning

confidence: 99%