Concentration of RE (Y, Pr, Sm, Gd, Dy, Yb) Elements in Liquid of Ba-Cu-O Liquid/REBa&lt;SUB&gt;2&lt;/SUB&gt;Cu&lt;SUB&gt;3&lt;/SUB&gt;O&lt;SUB&gt;7&amp;minus;&amp;delta;&lt;/SUB&gt; or RE&lt;SUB&gt;2&lt;/SUB&gt;BaCuO&lt;SUB&gt;5&lt;/SUB&gt; Two Phase Region

YBCO/Ag superconducting composites were fabricated by the unidirectional solidification method under various oxygen partial pressures. The effect of oxygen partial pressure on the growth interface stability and the morphology of (Y123)-Ag composite was investigated. The growth interface changed from planar to not planar with decreasing oxygen partial pressure. This phenomenon indicated that the interface stability was dominantly affected by the slope of liquidus, which is a significant function of the oxygen partial pressure. The morphology of the Y123-Ag composite was also strongly influenced by the oxygen partial pressure. In the case of 0.21 atm oxygen partial pressure , rod-like silver particles elongated along the growth direction were formed around the bottom of the facet crystal. On the other hand, spherical silver droplets were entrapped at the grain boundaries in the case of atm.

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Hybrid liquid phase epitaxy processes for YBa₂Cu₃O₇film growth

Kuršumović

Tomov

Hühne

et al. 2004

Supercond. Sci. Technol.

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A number of liquid phase epitaxy (LPE) related growth methods have been investigated. These hybrid-LPE processes enable high rate 'liquid assisted' growth of epitaxial YBa 2 Cu 3 O 7 films without the many disadvantages of classical LPE. Growth occurs by diffusive transport of Y through a thin liquid flux layer. This layer may be pre-deposited onto the substrate by various means including vacuum and non-vacuum techniques, or deposited at the growth temperature. The composition of the liquid layer is maintained during film growth by feeding YBa 2 Cu 3 O 7 , or the separate components, either from the vapour or by a powder route. Growth rates up to 10 nm s −1 have been demonstrated. Deposition of c-axis oriented epitaxial YBa 2 Cu 3 O 7 is reported on both seeded and non-seeded substrates; the process is tolerant of a high substrate mismatch. Films 1-2 µm thick with T c ∼ 90 K and a critical current density J c > 2 MA cm −2 have been grown on a range of single crystal substrates as well as on buffered textured metallic tapes. The mechanism of nucleation and growth from a thin liquid layer is described within the general theoretical framework of crystal growth. Particular features of the growth are the short time constant for equilibration of transients in the deposition conditions, the wide range of relative supersaturation spanned by the process, and dominance of interface kinetic effects compared to volume diffusion in the liquid flux.

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Concentration of RE (Y, Pr, Sm, Gd, Dy, Yb) Elements in Liquid of Ba-Cu-O Liquid/REBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7−δ</SUB> or RE<SUB>2</SUB>BaCuO<SUB>5</SUB> Two Phase Region

Cited by 3 publications

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The Growth Modes and Transport Properties of YBaCuO Prepared by Batch and Continuous Liquid Phase Epitaxy

The Growth Modes and Transport Properties of YBaCuO Prepared by Batch and Continuous Liquid Phase Epitaxy

Influence of oxygen partial pressure on growth morphologies in unidirectionally solidified YBCO-Ag superconducting composites

Hybrid liquid phase epitaxy processes for YBa₂Cu₃O₇film growth

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Concentration of RE (Y, Pr, Sm, Gd, Dy, Yb) Elements in Liquid of Ba-Cu-O Liquid/REBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7&minus;&delta;</SUB> or RE<SUB>2</SUB>BaCuO<SUB>5</SUB> Two Phase Region

Cited by 3 publications

References 0 publications

The Growth Modes and Transport Properties of YBaCuO Prepared by Batch and Continuous Liquid Phase Epitaxy

The Growth Modes and Transport Properties of YBaCuO Prepared by Batch and Continuous Liquid Phase Epitaxy

Influence of oxygen partial pressure on growth morphologies in unidirectionally solidified YBCO-Ag superconducting composites

Hybrid liquid phase epitaxy processes for YBa2Cu3O7film growth

Contact Info

Product

Resources

About

Concentration of RE (Y, Pr, Sm, Gd, Dy, Yb) Elements in Liquid of Ba-Cu-O Liquid/REBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7−δ</SUB> or RE<SUB>2</SUB>BaCuO<SUB>5</SUB> Two Phase Region

Hybrid liquid phase epitaxy processes for YBa₂Cu₃O₇film growth