High-temperature deformation of polycrystalline Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub x}.

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Appl. Supercond.

DOI:https://doi.org/10.1016/S0964-1807(97)00013-6· OSTI ID:937954

Didier, L; Routbort, J L; Mitchell, J F; Goretta, K C

High-temperature deformation of {approx} 75-80% dense polycrystalline Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub x} (Tl-2212) was studied at {approx} 90% of its melting temperature. For strain rates Image of 5 x 10{sup -6} - 2 x 10{sup -5} s{sup -1}, deformation occurred by diffusional flow. The creep rate could be described by an Arrhenius relationship: {dot {eta}} = A{sigma}{sup 1.3 {+-} 0.2}pO{sub 2}{sup -1/(2.2 {+-} 0.5)}{center_dot} exp(-(566 {+-} 150 kJ/mole)/RT), where A is a constant, {sigma} is stress, pO{sub 2} is oxygen partial pressure, R is the gas constant, and T is absolute temperature. The activation energy was ascribed to diffusion of one of the cations along short-circuiting paths such as grain boundaries, stacking faults, or dislocation cores. The pO{sub 2} dependence of {dot {eta}}was similar to that obtained previously for YBa{sub 2}Cu{sub 3}O{sub x}.

• Research Organization: Argonne National Laboratory (ANL)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 937954
• Report Number(s): ANL/ET/JA-24607
• Journal Information: Appl. Supercond., Journal Name: Appl. Supercond. Journal Issue: 7/8 ; 1996 Vol. 4
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
BARIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
CREEP
DEFORMATION
DIFFUSION
HEAT TREATMENTS
POLYCRYSTALS
THALLIUM OXIDES