Hardness response of YBa2Cu3O7−x

Martı́nez, L.; Albarrán, J.L.; Valdés, S.H. Díaz; Fuentes, J.

doi:10.1016/0921-4534(88)90063-9

Cited by 15 publications

(8 citation statements)

References 4 publications

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“…Sakai et al [22] reported a value of 370 GPa for samples prepared by TSMG using a single domain of Sm-123 as a seed [4], and they attributed the difference in E value compared to other published values to the 40% excess of Y-211 phase present in their material. Our results for Y-123 from the different samples, without any doping agents, agree with Johansen [3], Alford et al [6], and Roa et al [2] The Y-211 values for the different samples textured by the Bridgman and TSMG techniques agree with Martínez et al [23].…”

Section: Resultssupporting

confidence: 93%

AFM as an alternative for Young’s modulus determination in ceramic materials in elastic deformation regime

Roa

Oncins

Dias

et al. 2011

Physica C: Superconductivity

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Section: Resultssupporting

confidence: 93%

AFM as an alternative for Young’s modulus determination in ceramic materials in elastic deformation regime

Roa

Oncins

Dias

et al. 2011

Physica C: Superconductivity

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“…On the other hand, the true hardness H 0 for samples S1, S2, and S3 are 0.741, 0.927, and 1483 GPa, respectively. These values were lower than those reported in the literature [18,26].…”

Section: Resultscontrasting

confidence: 82%

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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“…Ling and Yan [6] have reported that the microhardness of YBa,Cu,O, increased to the single crystal value 8.73 GPa [7] by doping 10"h Li to the Cu ratio and to 7.75 G P a by doping Zn to the Cu ratio. Anisotropic hardness response of YBa,Cu,O,-, has also been reported by Martinez et al [8]. But to our knowledge, detailed hardness studies on Bi-0 compounds have not yet been initiated.…”

Section: Introductionsupporting

confidence: 64%

“…where Y is the yield strength, (8) the effect of friction between the indenter and the surface of the sample on the indentation mark is assumed as negligible, since the frictional coefficient is usually of the order of 0.1 to 0.2 [14]. When the friction exists, the indentation pressure P / A , exerted on the surface, is modified [14] to P p' 1 A(1 + pcotb)' (9) where p is the coefficient of friction.…”

Section: Volume Term a mentioning

confidence: 99%

Hardness and elastic moduli of Bi2−xPbxCa2Sr2Cu3Oy superconductors

Veerender

Dumke

Nagabhooshanam

1994

Phys. Stat. Sol. (a)

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X‐ray diffraction, de resistivity, and microhardness studies of Bi2−xPbxCa2Sr2Cu3Oy Superconductors with x = 0 to 0.4 are performed. The first two studies evidence the formation and improvement of the 2223 phase with the rise in Pb concentration up to 0.3, and later a reduction. The variation of microhardness with load P is analysed for each Bi2−xPbxCa2Sr2Cu3Oy SuperconductorsBi2−xPbxCa2Sr2Cu3Oy Superconductors with x = 0 to 0.4. Experimental results of the diagonal length of the indenter impression, d, corresponding to each load P is fitted with the relation P = A1d + A2d2 and the constants A1 and A2 are determined for each sample. Both A1 and A2 are found to have an anomalous variation with Pb concentration attaining, at x = 0.3 a minimum and a maximum, respectively. Young's modulus and yield strength of each sample are determined using the constant A2 and their values are maximum for the sample with x = 0.3. Moreover, the constant A1 is negative for the sample with x = 0.3 and positive for the rest of the samples. These results are explained on the basis of low and high Tc phases, surface energy, and bulk hardness.

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Hardness response of YBa2Cu3O7−x

Cited by 15 publications

References 4 publications

AFM as an alternative for Young’s modulus determination in ceramic materials in elastic deformation regime

AFM as an alternative for Young’s modulus determination in ceramic materials in elastic deformation regime

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

Hardness and elastic moduli of Bi2−xPbxCa2Sr2Cu3Oy superconductors

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