Growth of a/c grain boundary with well-defined facet in single-crystalline YBa2Cu3O7−δ film by liquid phase epitaxy

Evolution of Oriented Structures in YBa2Cu3O7−δ Films by Liquid Phase Epitaxy through Manipulating Supersaturation

“…Figure schematically illustrates the relationship between the supersaturation and the growth rates ( R ) of the a - and c -films, where σ a , σ a 2 , and σ c are critical supersaturations for nucleation of 0° a- grain, 90° a- grain, and c -grain, respectively. Furthermore, it is noticeable that two R ∼ σ curves cross each other at σ cross , where R a equals R c .…”

The Orientation Transition and Control of REBaCu3Oy Films Grown by Liquid Phase Epitaxy

“…Except for a - and c -films, the a/c -axis oriented grain boundary ( a/c GB), one of the most important microstructures among the Josephson junctions, has also attracted significant attention and has been actively studied. Superior to the conventional polycrystalline films with ill-defined grain boundary facets through prior art deposition, − the LPE processed a/c GB in a single-crystalline YBCO film featuring a well-defined facet was achieved by the LPE technique through selective growth on the NGO substrate coated with a half of c -axis YBCO film . In this approach, suitable seed materials and driving force for a - and c -phases to simultaneously nucleate on the identical substrate are essential prerequisites for the growth of the desirable microstructure.…”

“…More recently, based on those theories, effective novel approaches have been developed to tune supersaturation in the solution for the controllable growth of oriented films. − Moreover, it is achievable to grow the a- and c -axis oriented phase ( a -, c -phase) on an identical NGO substrate. Through fine manipulating supersaturation, desirable artificial microstructures, such as a/c grain boundary structures and a -grains composited with c -films have been successfully fabricated, − which expand the application field of REBCO films and facilitate the exploration of underlying physics. The thriving research on crystallographic orientation of REBCO films has generated a great number of publications.…”

c-Oriented YBa2Cu3O7−δ film with embedded a-oriented grains grown by liquid phase epitaxy under fine-tuning supersaturation

“…5 presents the growth rates (R) of a-and c-films as a function of supersaturation in the LPE solution, schematically illustrating the formation of a-and c-films and the composite epitaxial structure on the (110) NGO substrate. Here, a and c are the critical s for a-and c-film nucleation (Cai et al, 2006;Tang et al, 2009;Xiang et al, 2017), respectively. As noted earlier (Cai et al, 2006;Chen et al, 2012;Guo et al, 2014a), low and high provide suitable conditions for the a-and c-film growth, respectively, by which we obtained Films I and II.…”

“…More importantly, some artificial microstructures in oriented films have been of particular interest for both science and technology. For instance, a/c grain boundaries have been successfully prepared by so-called selective growth, potentially acting as Josephson junctions (Ushida et al, 1991;Hontsu et al, 1992;Mukaida & Miyazawa, 1993;Shingai et al, 2005;Xiang et al, 2017). In addition, c-films with a variety of epitaxial nanoparticles as sources of flux pinning (Haugan et al, 2004;MacManus-Driscoll et al, 2004;Gutié rrez et al, 2007;Abellá n et al, 2011) have been widely produced by various deposition methods, greatly enhancing the critical current density (J c ).…”