Mechanical properties of (Cu0.5Tl0.5)-1223 added by nano-SnO2

Mohammed, N. H.; Abou‐Aly, A. I.; Ibrahim, I. H.; Awad, R.; Rekaby, M.

doi:10.1016/j.jallcom.2009.07.034

Cited by 64 publications

(9 citation statements)

References 44 publications

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“…Almost all the diffraction peaks are associated with the tetragonal structure of CuTl-1223 superconducting phase followed by p4/mmm symmetry. The comparison of XRD spectra shows no change in crystal structure of CuTl-1223 superconductors with addition of Al 2 O 3 nanoparticles, which indicates the presence of nanoparticles over inter-granular sites [31]. Few un-indexed peaks of very low intensity correspond to CuTl-1234 phase and other impurity phases.…”

Section: Resultsmentioning

confidence: 94%

Infield response of (Al2O3)x/CuTl-1223 nanoparticles-superconductor composites

Waqee-ur-Rehman

Qasim

Mumtaz

et al. 2015

Physica B: Condensed Matter

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Section: Resultsmentioning

confidence: 94%

Infield response of (Al2O3)x/CuTl-1223 nanoparticles-superconductor composites

Waqee-ur-Rehman

Qasim

Mumtaz

et al. 2015

Physica B: Condensed Matter

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“…As for the state of n>2 (the exponential power value of n is higher than 2), the material studied presents the unusual RISE nature. At the last condition of n=2 (n is equal to 2), the material is called as Kick's material whose mechanical characteristic behavior is totally independent upon the indentation test load applied [21,22]. As for the investigation according to the Meyer's law of our materials in Figure 1 (linear differentiations of ln F over ln d curves), all the exponential power values of n are found to be lesser than 2 ( Table 2).…”

Section: Load-dependent Vickers Performance Parameters Of Solid Vanadmentioning

confidence: 83%

EXAMINATION OF VANADIUM EFFECT ON GENERAL MECHANICAL CHARACTERISTICS OF Bi-2223 MATERIALS VIA SEMI-EMPIRIC MODELS

Soykan

Valiyeva

2020

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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In the current work, we semi-empirically investigate the load-independent Vickers hardness values of vanadium added Bi-2223 compounds in the plateau limit regions evaluated from the experimental microhardness graphics (Vickers hardness parameters versus applied indentation test loads) to determine the role of vanadium particles on the general mechanical characteristics with the aid of six mechanical modeling approaches, namely law of Meyer, proportional sample resistance, elastic/plastic deformation, modified proportional sample resistance, Hays-Kendall and indentation-induced cracking models. Throughout the study, the samples are prepared with the different molar rations varying from x=0 to 0.3 by the conventional ceramic method in the normal atmospheric pressure at the room temperature conditions. All the model findings show that the mechanical performances tend to constantly reduce with increasing the vanadium concentration level embedded in the Bi-2223 superconducting crystal system. This is in accordance to the fact that the concentration level of vanadium remarkably damages the main structural problems and permanent irreversible deformations. In this respect, it is not wrong to verify that the vanadium inclusions unstabilize the inherit durable tetragonal phase of Bi-2223 inorganic solids, resulting in the regression in the mechanical durability (resistance towards to the applied loads) in case of the applied test loads. Moreover, the models indicate that every material prepared exhibits the conventional indentation size effect (related to the formation of elastic and plastic deformations in the host crystal structures simultaneously due to the recovery of systems) but within the suppression trend. Shortly, all the semi-empiric models preferred in the present work are found to be useful descriptors to define the suitable relationship between the ion-addition mechanism in the crystal lattice and mechanical durability/performances of vanadium-added Bi-2223 materials. We should, of course, declare here that Hays-Kendall approach is gathered to be the best approach model for the load-independent Vickers hardness values in the plateau limit regions.

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“…If n> is higher than the value of 2, the compound exhibits the unconventional RISE feature. If n = 2, the microindentation hardness parameters are independent upon the applied test load [20]. The main difference between the ISE and RISE characteristic behavior is the recovery mechanism.…”

Section: Examination Of True Vickers Microindentation Hardness Parameters With Meyer's Lawmentioning

confidence: 99%

Effect of annealing ambient conditions on crack formation mechanisms of bulk Bi-2212 ceramic systems

Erdem

Akkurt

Ülgen

et al. 2021

Journal of Asian Ceramic Societies

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This study paves way to examine the influence of different annealing conditions (temperature range of 830-850°C and duration intervals 24-48 h) on the fundamental mechanical performance and characteristic quantities of polycrystalline Bi 2.1 Sr 2.0 Ca 1.1 Cu 2.0 O y (Bi-2212) superconducting ceramics by means of Vickers microindentation hardness tests at the various indentation test loads (0.245 N≤F≤2.940 N) and some available theoretical approaches. The annealing ambient plays an important role on the operable slip systems and crystal quality. The bulk Bi-2212 superconducting compound prepared at 840 °C and 24 h is found to be the least sensitive to the applied test load due to less structural problems, voids, cracks and stress raisers in the crystal system. Conversely, the excess annealing ambient complicates remarkably the control of crack growth size and velocity. Thus, relatively lower load can lead to the formation of crack and acceleration of crack rate up to the critical size and terminal velocity. The samples exhibit the typical indentation size effect (ISE) behavior as a result of predominant character of elastic recovery mechanism. As for the theoretical examination in the saturation limit regions, the indentation-induced cracking (IIC) model wins the comparison as it provides the most accurate results to the experimental findings.

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Mechanical properties of (Cu0.5Tl0.5)-1223 added by nano-SnO2

Cited by 64 publications

References 44 publications

Infield response of (Al2O3)x/CuTl-1223 nanoparticles-superconductor composites

Infield response of (Al2O3)x/CuTl-1223 nanoparticles-superconductor composites

EXAMINATION OF VANADIUM EFFECT ON GENERAL MECHANICAL CHARACTERISTICS OF Bi-2223 MATERIALS VIA SEMI-EMPIRIC MODELS

Effect of annealing ambient conditions on crack formation mechanisms of bulk Bi-2212 ceramic systems

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