Growth-induced inhomogeneities in bulk melt-textured YBaCuO crystals

Surzhenko, A. B.; Schauroth, S.; Litzkendorf, D.; Zeisberger, Matthias; Habisreuther, T.; Gawalek, W.

doi:10.1016/s0921-4534(02)00975-9

Cited by 12 publications

(11 citation statements)

References 8 publications

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“…( 12). This feature is accompanied by the obvious tendency for j m to decrease (from the top surface to the bottom one) and may readily be explained by the growth-related inhomogeneities of the MT material 29,30 .…”

Section: A Cut Rings In the Remanent Statementioning

confidence: 92%

“…8). At our growth temperature (T = 988 • C) the height of the c-GS is approximately a half of its base 30 . So, high rings (2L ≥ R i ) seem to consist of the superconducting material with different j m .…”

Section: A Cut Rings In the Remanent Statementioning

confidence: 94%

“…This feature is accompanied by the obvious tendency for j m to decrease ͑from the top surface to the bottom one͒ and may readily be explained by the growth-related inhomogeneities of the MT material. 29,30 In particular, the top-seeded MT crystal grows due to the motion of five habitus planes-viz., ͑100͒, (1 00), ͑010͒, (01 0), and (001 )-which form, respectively, four a-growth sectors ͑GS's͒ and the c-GS. The latter usually has the shape of a regular pyramid with a vertex in the seeding point ͑see Fig.…”

Section: A Cut Rings In the Remanent Statementioning

confidence: 99%

“…At our growth tempera-ture (Tϭ988°C) the height of the c-GS is approximately a half of its base. 30 So high rings (2LуR i ) seem to consist of the superconducting material with different j m . Grinding the ring bottom, we gradually deleted a part with a worse j m and, thereby, made the ring more homogeneous.…”

Section: A Cut Rings In the Remanent Statementioning

confidence: 99%

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Intergrain and intragrain currents in bulk melt-grownYBa2Cu3O7

Surzhenko¹,

Zeisberger²,

Habisreuther³

et al. 2003

Phys. Rev. B

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A simple contactless method suitable for discerning between the intergrain ͑circular͒ current, which flows in the thin superconducting ring, and the intragrain current, which does not cross the weakest link, has been proposed. At first, we show that the intergrain current may directly be estimated from the magnetic flux density B(Ϯz 0 ) measured by the Hall sensor positioned in the special points Ϯz 0 above or below the ring center. The experimental and numerical techniques to determine the value z 0 are discussed. Being very promising for the characterization of a current flowing across the joints in welded YBaCuO rings ͑its dependences on the temperature and external magnetic field as well as the time dissipation͒, the approach has been applied to study the corresponding properties of the intragrain and intergrain currents flowing across the a-twisted grain boundaries which are frequent in bulk melt-textured ͑MT͒ YBaCuO samples. We present experimental data related to the flux penetration inside a bore of MT YBaCuO rings both in the nonmagnetized, virgin state, and during the field reversal. The shielding properties and their dependence on external magnetic fields are also studied. Besides, we consider flux creep effects and their influence on the current redistribution during a dwell.

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Section: A Cut Rings In the Remanent Statementioning

confidence: 92%

Section: A Cut Rings In the Remanent Statementioning

confidence: 94%

Section: A Cut Rings In the Remanent Statementioning

confidence: 99%

Section: A Cut Rings In the Remanent Statementioning

confidence: 99%

See 2 more Smart Citations

Intergrain and intragrain currents in bulk melt-grownYBa2Cu3O7

Surzhenko¹,

Zeisberger²,

Habisreuther³

et al. 2003

Phys. Rev. B

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“…Numerous studies on YBCO bulk materials focus on the optimisation of their microstructure and electrical properties [5,8,10,13,[15][16][17][18], but little is known about the mechanical properties of these materials.…”

mentioning

confidence: 99%

The contribution of 211 particles to the mechanical reinforcement mechanism of 123 superconducting single domains

Mathieu

Cano

Koutzarova

et al. 2003

Supercond. Sci. Technol.

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Hardness and fracture toughness of Dy-123 single-domains were studied by Vickers microindentation. A significant anisotropy of the mechanical properties was observed. Hardness tests give higher values when performed in (001) planes rather than in planes parallel to the caxis. Moreover cracks pattern around the indentation follows preferential orientation in planes parallel to the c-axis whereas a classical four-cracks pattern is observed in the (001) planes.It has been possible to show the crucial role played by the 211-particles in the deviating mechanism of cracks and the relevance of the 211-particle distribution high homogeneity in the material.

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