Multiseeding with (100)/(100) grain junctions in top-seeded melt growth processed YBCO superconductors

Multiseeded melt growth of bulk Y–Ba–Cu–O using thin film seeds

“…9 The results of the present study, however, indicate clearly that the presence of residual melt is also determined by the growth orientation of impinging grains. The growth fronts of two impinging YBCO grains are parallel to each other during the formation of the (100)/(100) grain boundary, as shown schematically shown in Fig.…”

“…Unfortunately, the MSMG method may result in the trapping of unreacted liquid phase material at grain boundaries, which can degrade the field trapping ability of the bulk sample. [7][8][9][10][11] The presence of unreacted liquid has been observed frequently at the (100)/(100) grain boundary, but rarely at the (110)/(110) grain boundary. [8][9][10] SmBCO (Sm-123) and NdBCO (Nd-123) bulk and single crystal superconductors are used commonly as seeds for the growth of single grain YBCO due to their good lattice match and higher melting points than the Y-123 phase.…”

Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

“…Unfortunately, the MSMG method may result in the trapping of unreacted liquid phase material at grain boundaries, which can degrade the field trapping ability of the bulk sample [139][140][141][142][143]. The presence of unreacted liquid has been observed normally at the (1 0 0)/(1 0 0) grain boundary, but rarely at the (1 1 0)/(1 1 0) grain boundary [140][141][142]. However, with conventional SmBCO and NdBCO crystal-seeds, the contact angle of grains cannot be controlled accurately in a multi-seeding process.…”

A Method of Mechanical Control of Structure-property Relationship in Grains-containing Material Systems

“…The force field acts as if it would assure the uniform squeezing of the material from each space side, causing this way the small grains to occur at the expense of fine-graining and densification conditions expected to manifest in parallel [2,7]. By applying so-described procedure, one can obtain materials with a superplastic behavior (such as the ones concerning Al-type nanomaterials [1,2]) or materials with improved superconducting properties (such as YBaCuO ceramic materials created by top-seeded multilayers method [7]). This force field would modify accordingly the SD-drift function (Eq.…”

“…It assumes that one is able to embody to the material the superconductivity property, when a certain secondary phase will be removed from the grain-boundary territory [7]. The experimental strategy relies on squeezing out a molten residual phase this way rendering the grain boundaries clean, i.e.…”