Effect of Nb doping on properties of Y-Ba-Cu ceramics

Abstract

The properties of Nb-doped YBa,Cu,O, ceramics obtained by thermolysis of the oxide or nitrate (Y, Ba, Cu) solution in ammonium nitrate melt were studied. For t h e composition YBa,Cu,~,Nb,,,,O,., , T, = 92 K and the transport critical current J , = 100&4000 A cm? were obtained. The magnetic flux profile was studied by a magneto-optic method at B = 290 G. Domains of size 200400 fin-were found with magnetic critical current J," = 2 x lo4 A cm-2 at 77 K and IO5 A cm-2 at 11 K.

Oxygen Doping Effects on Super-resolution Scattering-mode Near-field Optical Data Storage

“…This phase is the most stable Nb-related compound when in equilibrium with YBCO, explaining why when we add Nb 2 O 5 or BaNbO 3 to YBCO, the double perovskite YBa 2 NbO 6 still forms [14][15][16]. We find that nanoparticles of the phase self-assemble in a manner similar to the tantalates [13] and BZO [17].…”

Properties of YBCO superconductors prepared by ammonium nitrate melt and solid-state reaction methods

“…The same method can be used for ceramic materials such as high T c superconductors (HTs). The technique was first applied to YBa 2 Cu 3 O 7−x (Y-123) by the Russian group [6][7][8] in the Institute of Solid State Physics (ISSP-RAS) in 1990 and later by the other groups [4,9,10]. High-T c phase of the Bi-based superconductors [11][12][13][14], ruthenium based HTs (Ru-1222 and Ru-1212) were also synthesized using ANM with shorter heat treatments [15].…”

Phase formation and magnetic anomalies in RuSr2RECu2O8 (RE=Eu, Gd, Ho) samples

“…When the precursor is heat-treated above the crystallization temperature of the target phase, the amount of oxygen reaches a balance which results in the formation of the desired oxide phase. We have successfully applied this method to obtain different oxide systems, such as superconductive YBa 2 Cu 3 O 7 and ferromagnetic BaFe 12 O 19 [20,21]. Recently, we also succeeded in synthesizing RuEu 1.5 Ce 0.5 Sr 2 Cu 2 O 10 samples, having a T c $70 K, in a short time at low annealing temperatures [22].…”