Abstract
Microstructure, strength and other HTSC properties are defined by the existence of numerous components. This circumstance supposes different chemical, physical and mechanical influences during numerous technological operations to prepare final sample from initial powders. Super-sensitiveness of HTSC final properties to the technical conditions, their manufacture and to composition features, and also numerous effects have determined various ways of the oxide superconductor preparation. HTSC samples in the forms of films at the mono- and polycrystalline substrates, coated conductors, tapes and superconducting bulks are the most interesting for applications. Their preparation techniques are considered in this chapter.
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Notes
- 1.
Due to the high anisotropy of HTSC, films with c-axis orientation only have good transport and screening properties. At the same time, films with a-axis orientation, possessing greater coherence length in direction that is perpendicular to the surface and distinguished by high smoothness, could be convenient to prepare qualitative HTSC Josephson junctions, consisting of successively deposited “HTSC-normal metal” (or “dielectric–HTSC”) layers. Films demonstrating mixed orientation are not desirable in all cases.
- 2.
The varieties of impulse laser deposition, used to obtain YBCO films and coated conductors with high texture on the different mono- and polycrystalline substrates with and without buffer layers, permit to reach the critical current density J c = 2.4 MA/cm2 at 77 K and zero magnetic field [463].
- 3.
For simplicity and clearness, a thin passivation layer for stabilization, insulation and encapsulation is excluded.
- 4.
It should be noted that the term melt processing clearly distinguishes from a lower-temperature processing, where only a portion of the Bi-2212 is melted, which is called liquid-assisted processing [667].
- 5.
Obviously, the initial increase in critical current is connected with improvement in quality of intercrystalline boundaries. However, this factor has secondary value at longer sintering.
- 6.
This, in the first place, is explained by that Bi-2223 phase is stable only in very small temperature intervals (in difference from Bi-2212 phase) and kinetics of its formation is very slow to obtain mono-phase material.
- 7.
There are hot seeding and cold seeding [772]. In the first case, the seed is placed on YBCO sample at room temperature, in the second case the seed is placed at temperature T max above the peritectic temperature (Fig. 3.34c).
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© 2012 Springer-Verlag Berlin Heidelberg
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Parinov, I.A. (2012). Composition Features and HTSC Preparation Techniques. In: Microstructure and Properties of High-Temperature Superconductors. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34441-1_3
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DOI: https://doi.org/10.1007/978-3-642-34441-1_3
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Online ISBN: 978-3-642-34441-1
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