Fluorine-free sol–gel preparation of YBa2Cu3O7−x superconducting films by a direct annealing process

Influence of sintering conditions in the preparation of acetate-based fluorine-free CSD YBCO films using a direct sintering method

“…Crossing the YBCO unstability temperature (zone 5), Y 2 BaCuO 5 is formed according to reaction (15). Moreover, small YBCO reflections are present, presumably formed during heating and not completely decomposed during sintering.…”

“…Avoiding the introduction of fluor is a huge advantage because the release of toxic HF and critical partial water vapor pressures during processing are avoided. Therefore, during the last years, low fluorine [8,9] and non-fluorine [10][11][12][13][14][15][16][17][18][19][20][21] containing CSD methods are gaining ground. In order to generate sustainable fluorine-free YBCO films, a precursor solution containing water as primary solvent was developed by us previously, the so-called AWAT precursor (metal-Acetates, Water, Acetic acid and Tri-ethanolamine).…”

Fluorine-free propionate route for the chemical solution deposition of YBa2Cu3O7−x superconducting films

“…The formation of BaCO 3 phase during the heat treatment can degrade the superconductivity of the YBCO films. Several authors report on the successful precursor decomposition during the heat treatment and obtained YBCO films with high critical current [16][17][18]. These studies have revealed that BaCO 3 can react with CuO to generate the BaCuO 2 phase which then reacts with Y 2 O 3 to form YBCO, thus achieving the elimination of the BaCO 3 in the final films.…”

Nanoscopic yttrium oxide fluorides: non-aqueous fluorolytic sol–gel synthesis and structural insights by19F and89Y MAS NMR

“…Due to its stabilizing properties it is used as additive in ceramics, usually as additive to zirconium oxide [1,2], as sintering aid or as coating material . [6] Moreover, Y 2 O 3 is the basic material for the production of melts allowing the extraction of doped or undoped laser crystals like Y 3 Al 5 O 12 (YAG, yttrium-aluminium garnet) [7][8][9], or crystals like Y 3 Fe 2 (FeO 4 ) 3 (YIG, yttrium-iron garnets), used as microwave filters. for IR-and UV transparent glasses or laser glasses.…”