Effect of low-temperature treatment and subsequent high-temperature annealing on the critical current density of YBa2Cu3O y

Бобылев, И. Б.; Zyuzeva, N. A.

doi:10.1134/s1063783412070074

Cited by 16 publications

(6 citation statements)

References 15 publications

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“…Moreover, after the double heat treat ment, depending on field, the critical current density increases as compared to that for samples prepared by the traditional ceramic technology [15] is observed. The cause for improvement is the retention of a por tion of stacking faults formed in the course of low temperature annealing.…”

Section: Introductionmentioning

confidence: 89%

Effect of plastic deformation on the electrophysical properties and structure of YBa2Cu3O y ceramics subjected to low-temperature treatment

Бобылев

Zyuzeva

Degtyarev

et al. 2015

Phys. Metals Metallogr.

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The electrophysical properties and structure of HTSC YBa 2 Cu 3 O y compound (123) subjected to plastic deformation by shear under a pressure of 1.7 GPa have been studied. After deformation, the electro physical properties of samples prepared using the traditional ceramic technology were found to deteriorate. Subsequent annealing at 930°C cannot restore the critical current density (j c ) in low magnetic fields to initial magnitudes; however, in magnetic fields of more than 0.1 T, the j c magnitude increases compared to that for the starting state. The deformation of 123 ceramics treated at 200°C in a humid atmosphere that has under gone phase transformation into the 124 tetragonal phase allows its structure and electrophysical properties to be restored. In this case, the reverse transformation of phase 124 into 123, which is accompanied by the recrystallization of the material, takes place. The combination of low temperature treatment and high shear ing deformation leads to the appearance of texture and an increase of j c , in particular in high magnetic fields.

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Section: Introductionmentioning

confidence: 89%

Effect of plastic deformation on the electrophysical properties and structure of YBa2Cu3O y ceramics subjected to low-temperature treatment

Бобылев

Zyuzeva

Degtyarev

et al. 2015

Phys. Metals Metallogr.

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“…We simulate the metal sphere using two-component homogeneous solid environment consisting of two continuous continuums: the conduction electrons and lattice ions, for which carried out the hypothesis of continuity and local thermodynamic equilibrium [2,3].…”

Section: Research Objectmentioning

confidence: 99%

“…To describe mechanoelectric distributions in the sphere we consider two pairs of parameters of the thermodynamic state : a) for redistribution of electrical charges -concentration of electrons Ce, ions Cion and the chemical potentials Me, Mion corresponding them (concentrations are dimensionless, dimension of chemical potentials -J/kg); b) for the stressed state -tensors of deformation ê and mechanical stresses  [2][3][4][5].…”

Section: Selecting State Parametersmentioning

confidence: 99%

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Mechano-electric Characteristics of the Near-surface Layer of Some Materials

Yuzevych¹,

Koman²,

Dzhala³

2016

J. Nano- Electron. Phys.

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Based on the proposed mathematical model the mechano-electric characteristics of the near-surface layer of solids included in the linear equation of state and connecting the parameters of states were calculated. Quasiequilibrium condition model of conduction electrons (related charges) on electric double layer on the surface of solid were presented. For the first time, the most important physical quantities to the surface-surface and interfacial charge Ω, the electrical component of the surface energy e, the thickness of the surface layer h, electric double layer capacitance C and Galvani potential  for a number of materials: Cr, W, Gd, Hf, Pd, Mg, Ta, Sm, Si, Cu were calculated. These parameters for the diagnosis of structural elements in aggressive environments can be used and energy characteristics of surface and interfacial layers can be determinated.

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“…In [12], it was found that, during the treatment of highly-textured YBa 2 Cu 3 O 6.8 ceramics, packets of 124-type planar stacking faults are formed. In [14][15][16], it was shown that such defects are pinning centers favoring a substantial increase in the critical current density, especially in magnetic fields applied perpendicularly to the axis c.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of interaction of YBa2Cu3O y with water vapor at low-temperature annealing

Бобылев

Zyuzeva

2016

Phys. Solid State

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The interaction of YBa 2 Cu 3 O y (123) with water vapor at temperatures T ≤ 150° has been studied. It has been shown that, with an increase in temperature, the mechanism of its interaction with water changes. Near room temperature, the main process is hydrolytic decomposition. At T ~ 100°C, the absorption of water is significantly reduced, because the role of hydrolysis becomes less important and water penetrates the structure weakly and is incorporated into oxygen vacancies mainly in the form of OH --groups, which leads to the transition of YBa 2 Cu 3 O y from the tetragonal to orthorhombic phase. With an increase in temperature to 150°C, the absorption of water increases again. In this case, the main mechanism is the penetration of water to the 123 structure, which leads to splitting of Cu-O chains and a phase transition from the 123 to pseudo-124 structure. The role of different mechanisms of interaction with water essentially depends on the oxygen content in the 123 structure. At a low oxygen index (y = 6.3), the role of hydrolysis is more important, and, at y ≥ 6.5, the incorporation of water into the structure prevails. It has been revealed that, at T = 150°C, after absorption of water, YBa 2 Cu 3 O 6.96 becomes a proton conductor.

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Effect of low-temperature treatment and subsequent high-temperature annealing on the critical current density of YBa2Cu3O y

Cited by 16 publications

References 15 publications

Effect of plastic deformation on the electrophysical properties and structure of YBa2Cu3O y ceramics subjected to low-temperature treatment

Effect of plastic deformation on the electrophysical properties and structure of YBa2Cu3O y ceramics subjected to low-temperature treatment

Mechano-electric Characteristics of the Near-surface Layer of Some Materials

Mechanisms of interaction of YBa2Cu3O y with water vapor at low-temperature annealing

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