Determination of strain fields on two-dimensional images using the STC method

Chang, Won-Jae

doi:10.1016/j.commatsci.2019.03.032

Cited by 1 publication

(1 citation statement)

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“…For GPA, strain-free reference regions were selected in the REBCO matrix, as indicated with the red rectangle shown in figure 1. Both direct [80] and Fourier space strain calculations [81] have been implemented and crosscompared to ensure consistency of the results. Phase optimization relative to the reference crystal has been implemented utilizing non-linear optimization, yielding sub-pixel resolution.…”

Section: Methodsmentioning

confidence: 99%

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

Majkic

Jeong

Yun

et al. 2021

Supercond. Sci. Technol.

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We report on strain and composition effects associated with growth of self-assembled BaZrO 3 (BZO) nanorods in REBa 2 Cu 3 O 7−δ (REBCO) superconductors (RE = rare earth = Y and Gd), which have a profound effect on flux pinning and in-field critical current performance. The a-b plane mismatch between BZO and REBCO is never fully coherently accommodated. Instead, the nanorods always assume a size at least one unit cell smaller than the corresponding 'hole' in the REBCO matrix, thus providing deep minima of in-plane mismatch strain. Next, we show that the nominal BZO nanorods are in fact solid solution Ba 2+ (Zr 4+ 1−z RE 3+ z )O 3−δ perovskite, thus strongly affecting the stoichiometry and relative amounts of REBCO and BZO. We demonstrate that by varying only the Ba content in the nominal composition of 15 mol.% BZO + REBCO, the unit cell density of BZO can be tuned from 5% to 23%, and the linear density of RE 2 O 3 (REO) precipitates from 18 to 1 µm −1 . The results explain the wide range of pinning performances observed for the same nominal amount of Zr addition and provide insight into the mechanisms behind the complex phenomenon of growth of nanorods by self-assembly in REBCO superconductors.

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Section: Methodsmentioning

confidence: 99%

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

Majkic

Jeong

Yun

et al. 2021

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Determination of strain fields on two-dimensional images using the STC method

Cited by 1 publication

References 25 publications

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

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Determination of strain fields on two-dimensional images using the STC method

Cited by 1 publication

References 25 publications

New insight into strain and composition of BaZrO3 nanorods in REBCO superconductor

New insight into strain and composition of BaZrO3 nanorods in REBCO superconductor

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New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor

New insight into strain and composition of BaZrO₃ nanorods in REBCO superconductor