Effects of oxygen content on the pinning energy and critical current in the granular (Hg,Re)-1223 superconductors

A Description of the Transport Critical Current Behavior of Polycrystalline Superconductors Under the Applied Magnetic Field

“…This Josephson-type mechanism of conduction is responsible to the dependence of the critical current density on the magnetic field J c (H), as noted in several experimental studies [9][10][11]. On the other hand, the intragranular critical current is limited by an activated flux flow at high temperature and a high magnetic field [9,12,13].…”

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

“…A quartz rod (7 mm diameter and 40 mm length) was also introduced together with the pellet received an extra quantity of Hg (l) which turned immediately into amalgam form with gold. The ratio between the mercury mass and the gold mass was 0.045 [27,28] . Based on the study of quartz tube filling factor (ff) 26 , we used ff ≅ 1.0 g/cm 3 and ff Hg ≅ 0.010 g/cm 3 [26] .…”

“…The quartz tubes were sealed in a high vacuum of 3 × 10 -6 Torr. The average density of the pellet samples was ρ = 4.2(2) g/cm 3 [28,29] . All procedures have taken place inside a glove box filled with argon gas.…”

“…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 .…”