Distortion of ReO6 octahedron in the Hg0.82Re0.18Ba2Ca2Cu3O8+d superconductor

Critical Current Model for Polycrystalline Compounds with an Intrinsic Solid Solution of Two Mixed Superconductor Phases

“…The ceramic precursor preparation protocol began with a mixture of Ba 2 Ca 2 Cu 3 O x (99.0 %, PRAXAIR) and ReO 2 (99.0 %, Aldrich) in powder form with the molar relationship 1:0.18 [21]. These powders were homogenized, pelleted, and heated at 850 • C in a flow of oxygen (99.5 % purity) for 15 h. The precursor obtained was crushed, homogenized, and compacted again before being heated a second time at 920 • C for 12 h in a flow of oxygen.…”

“…These powders were homogenized, pelleted, and heated at 850 • C in a flow of oxygen (99.5 % purity) for 15 h. The precursor obtained was crushed, homogenized, and compacted again before being heated a second time at 920 • C for 12 h in a flow of oxygen. The latter procedure was repeated an additional seven times to provide good homogenization [22], as discussed in more detail in a prior work [21].…”

“…The ceramic precursors were prepared with different partial pressures of oxygen and Ar (PO 2 of 5 % for sample A, PO 2 of 10 % for sample B, and PO 2 of 15% for sample C) [21,23].…”

Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics

“…In order to improve the grain growth, the annealing time was changed to 72 h at 865°C, as compared to Sin et al 27 . All details of the synthesis processes and sample characterization were reported elsewhere [28][29][30] . Samples of SmBa 2 Cu 3 O 7-d were prepared by a solid-state reaction method using commercial oxide powders of Sm 2 O 3 (99.99% ), CuO (99.99%), and BaCO 3 (99.99%).…”

“…Prior to weighing and mixing, the oxides and carbonate powder were pre-annealed at 110°C for more than 24 h in air to release moisture. Then, the powders were weighed in a glove box, homogenized in an agate mortar for one hour, and put placed into alumina crucibles and calcined at 930°C for 40 hours in air 24,[27][28][29][30][31] . The obtained precursors were again homogenized, pressed into pellets (with the a diameter of 16 mm), sintered in a horizontal tube furnace in flowing oxygen (10 ml/min) at about approximately 1060°C for 72 h, then cooled to 520°C and, held at this temperature for 24 h, subsequently cooled in the furnace to room temperature 31 .…”