Influence of oxygen content and structural defects on low-temperature mechanical properties of high-temperature superconducting single crystals and ceramics

Lubenets, S. V.; Нацик, В. Д.; Fomenko, L. S.; Kaufmann, H; Bobrov, V. S.; Izotov, A. N.

doi:10.1063/1.593440

Cited by 14 publications

(6 citation statements)

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“…We note that the hardness also increases with increasing ZnO amount in the YBCO system. This correlation between hardness and density was reported by other researchers [19,20]. Figure 1 shows the X-ray diffraction patterns of the samples (a) S1 (b) S2, and (c) S3.…”

Section: Methodssupporting

confidence: 73%

Superconducting and Vickers hardness properties of ZnO‐added YBCO polycrystalline superconductors

Kölemen

Çelebi

Karal

et al. 2004

Physica Status Solidi (b)

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The effects of ZnO addition on the microstructure and mechanical properties of the YBCO have been investigated through XRD, SEM, EDX, ac susceptibility measurements and the standard Vickers microhardness testing method. We have prepared the samples by a conventional solid-state reaction method and used an additive method for the YBCO system (0, 0.5 and 1 wt% of ZnO). The orthorhombic strain ∆ = (b -a)/(b + a) increases as the Zn content increases, where a and b are the relevant lattice parameters of the samples. The superconducting transition temperatures and hardness depend on the Zn content of the samples. The hardness is found to be load dependent. From the relation between applied load F and the square of the impression diagonal, d 2 , the true hardness, H 0 , and the dissipative portion of the indentation load F 0 , were derived from the slope and the intercept (at d 2 = 0) of the straight line, respectively. The hardness was increased while the transition temperature decreased with the amount of ZnO addition to YBCO.

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Section: Methodssupporting

confidence: 73%

Superconducting and Vickers hardness properties of ZnO‐added YBCO polycrystalline superconductors

Kölemen

Çelebi

Karal

et al. 2004

Physica Status Solidi (b)

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“…This relation between hardness and density was reported by some other researchers. 23,24 In order to estimate the effect of ZnO addition on porosity of the samples, we measured the density of the samples and results were given in Table 1. When the results are examined comparatively, it is clearly seen that all measured and calculated characteristic parameters of the samples (i.e.…”

Section: Samplementioning

confidence: 99%

Modulus and hardness evaluation of polycrystalline superconductors by dynamic microindentation technique

Uzun

Kölemen

Çelebi

et al. 2005

Journal of the European Ceramic Society

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“…Bulk hardness of YBCO determinated at room temperature has been mostly obtained by conventional Vickers measurements and the values are in the range from 5 to 8 GPa [5,6]. Elastic modulus values measured in the range from nitrogen to room temperature and having a broad interval between 100-160 GPa [7].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of Ag-doped top-seeded melt-grown YBCO pellets

Foerster¹,

Lima²,

Rodrigues³

et al. 2008

Braz. J. Phys.

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In the present work we report the mechanical properties of ca(b)-planes of Ag-doped top-seeded melt-grown YBaCuO (YBCO) pellets at different concentrations. Hardness and elastic modulus were obtained by instrumented indentation and fracture toughness by conventional Vickers indentation. Hardness profiles for both planes indicated values between 7-8 GPa at deep tip penetration. Significant differences in elastic modulus were observed as a function of Ag content for the ab-plane while no difference were seen for the ca(b)-plane. Doping with 5 wt. % Ag 2 O increases the hardness and elastic modulus for the ab-plane in relation to the undoped sample due to Ag solid-solution hardening. Indentation fracture toughness rises with Ag doping for the ab-plane. Intensive plastic deformation was observed in ca(b) plane for conventional Vickers indentation.

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Influence of oxygen content and structural defects on low-temperature mechanical properties of high-temperature superconducting single crystals and ceramics

Cited by 14 publications

References 0 publications

Superconducting and Vickers hardness properties of ZnO‐added YBCO polycrystalline superconductors

Superconducting and Vickers hardness properties of ZnO‐added YBCO polycrystalline superconductors

Modulus and hardness evaluation of polycrystalline superconductors by dynamic microindentation technique

Mechanical properties of Ag-doped top-seeded melt-grown YBCO pellets

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