Mechanical properties of RE–Ba–Cu–O bulk superconductors

Sakai, Naomichi; Seo, Sehun; Inoue, Kazuo; Miyamoto, Takeshi; Murakami, Masato

doi:10.1016/s0921-4534(00)00153-2

Cited by 62 publications

(43 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Ag presence increases slightly the value from 140 to 150 GPa, but as also observed in the hardness profiles, the error bars are very large for all of the studied samples. The measured values of the elastic modulus in the present situation agree with the reported data [26][27][28][29][30][31][32] and the same interpretation of composite behavior can be used to interpret these results. 12 served.…”

Section: Resultssupporting

confidence: 90%

“…The measured hardness in these cases corresponds to an averaged behavior between the superconductor ceramic, the metallic Ag grains and the presence of defects. Taking into account this composite character of ours samples, the present hardness profiles are in agreement with reports in the literature for Y-123 based structures where hardness varies from 4 to 12 GPa [26][27][28][29][30][31][32]. Consequently, the broad range of the reported values can then be attributed to the different sample processing conditions and also to the employed measurement technique, which in almost of all reported situations corresponds to the conventional Vickers method.…”

Section: Resultssupporting

confidence: 89%

See 1 more Smart Citation

Effects of Ag addition on some physical properties of granular YBa2Cu3O7-δ superconductor

Azambuja¹,

Júnior²,

Jurelo³

et al. 2009

Braz. J. Phys.

View full text Add to dashboard Cite

The effects of Ag addition on some physical properties of Y Ba 2 Cu 3 O 7−δ superconductor has been studied. The samples were produced by different routes and characterized by scanning electron microscopy, differential thermal analysis, thermogravimetric analysis, X-ray diffraction and nanoindentation. The superconducting properties were studied by dc magnetization and electrical resistivity measurements. The X-ray patterns revealed that all samples were polycrystalline and corresponded to the orthorhombic Y Ba 2 Cu 3 O 7−δ phase. However, for some samples, silver appears to be present within the grains. The superconducting properties were not significantly influenced by Ag addition. Hardness and elastic modulus were also obtained by instrumented indentation. Ag addition was found to be effective in improving the mechanical properties, probably by filling the pores in the grain boundaries. Hardness profiles indicated values between 3.1 and 3.4 GPa at deep tip penetration depths. The highest elastic modulus of 146 GPa was attained for samples prepared using Y 2 O 3 , BaCO 3 , CuO and Ag 2 O as precursors, while the lowest modulus (125 GPa) was obtained for the pure Y Ba 2 Cu 3 O 7−δ sample.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%

Effects of Ag addition on some physical properties of granular YBa2Cu3O7-δ superconductor

Azambuja¹,

Júnior²,

Jurelo³

et al. 2009

Braz. J. Phys.

View full text Add to dashboard Cite

show abstract

“…Moreover, there is a tendency of the cracks direction to follow the indenter diagonals or/and along specific crystallographic planes. These crystallographic orientations are reported in the literature as {100} planes [10]. For the ca(b)-plane (Fig.…”

Section: Resultsmentioning

confidence: 59%

“…It is known that the addition of Ag causes a reduction in the number of pores and cracks in the YBCO microstructure [16]. Also, the increase of its concentration produces higher tensile and bending strengths [10]. Miyamoto et al [19] observed in melt-textured samples that Ag doping improves the mechanical properties of YBCO and SBCO using a strain gage technique as well as Markov et al [20] noticed an increase of microplasticity of polycrystalline YBCO ceramic with 3-5 wt.…”

Section: Resultsmentioning

confidence: 99%

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

Foerster¹,

Lima²,

Rodrigues³

et al. 2008

Braz. J. Phys.

View full text Add to dashboard Cite

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.

show abstract

“…One of them is the addition of Ag, which causes the reduction of pores and cracks in the microstructure [8][9], higher tensile and bending strengths [10] and an increase in microplasticiy [11].…”

Section: Introductionmentioning

confidence: 99%