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- W2023367346 abstract "A low-frequency internal friction peak was observed at 200 ifmmode^circelsetextdegreefi{}C for sintered ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{x}}$ bar specimens annealed at different temperatures between 400 and 650 ifmmode^circelsetextdegreefi{}C. This peak is interpreted in terms of diffusional jumps of oxygen atoms in the basal planes between sublattice sites ${mathrm{O}}_{mathrm{A}}$((1/2, 0,0) and ${mathrm{O}}_{mathrm{B}}$(0,(1/2,0). These two sites are not crystallographically equivalent in orthorhombic symmetry. Oxygen diffusivity for planar diffusion in the basal planes was derived on the basis of a one-dimensional random-walk process, which yields: D=((1/4)${d}^{2}$${C}_{B}$/(${C}_{A}$+${C}_{B}$)ensuremath{nu} ${ensuremath{nu}}_{0}$ exp(-${H}_{B}$/kT) =${D}_{0}$exp(-${H}_{B}$/kT), where ${H}_{B}$=${H}_{A}$+ensuremath{Delta}E. The parameters ${C}_{A}$, ${C}_{B}$, ${ensuremath{nu}}_{0}$, and ${H}_{A}$ are evaluated from internal friction data for the specimens of known oxygen deficiency x and ensuremath{Delta}E, the poten- tial energy difference between sites ${mathrm{O}}_{mathrm{A}}$ and ${mathrm{O}}_{mathrm{B}}$, from Boltzmann's distribution law ${C}_{A}$/${C}_{B}$=exp(-ensuremath{Delta}E/kT). The preexponential factor ${D}_{0}$=3.5ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}4}$ ${mathrm{cm}}^{2}$/sec and the activation energy of the 200 ifmmode^circelsetextdegreefi{}C internal-friction peak ${H}_{A}$=1.03 eV are both temperature insensitive. By contrast, ensuremath{Delta}E is temperature dependent; it is 0.23 eV at 400 ifmmode^circelsetextdegreefi{}C and decreases as the temperature is raised, vanishing at 670 ifmmode^circelsetextdegreefi{}C, the temperature of the orthorhombic-to-tetragonal transition temperature at which ${mathrm{O}}_{mathrm{A}}$ and ${mathrm{O}}_{mathrm{B}}$ sites become indistinguishable. Non-Arrhenius behavior exists between the oxygen diffusivity and the diffusion temperature in this type of diffusion mechanism." @default.
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- W2023367346 date "1989-09-01" @default.
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- W2023367346 title "Oxygen diffusion in the superconducting oxide<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math…" @default.
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- W2023367346 doi "https://doi.org/10.1103/physrevb.40.4549" @default.
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