Ag-doped NdBa2Cu3O7-δ (Nd123) superconducting ceramics were prepared by a sol-gel method using Nd(O-iC3H7)3, Ba(O-iC3H7)2, Cu(OH)2 and CH3COOAg as starting materials. Powders consisting of Nd123 and Ag (metal) were obtained by heating a calcined gel at 700°C in vacuum. The incongruent melting temperature of the Ag-doped Nd123 powders decreased probably due to interfacial reaction between Nd123 and Ag. Dense, sintered bodies could be prepared from the Ag-doped Nd123 powders through a heat-treatment process including incongruent melting. The sintered sample doped with 10mass% Ag showed Tc(onset) at 93 K and Tc(end) at 86 K after annealing in O2 at 400°C for 200 h. The improvement of the superconducting properties in Ag-doped Nd123 is attributed to densification of the samples by incongruent melting.
|Number of pages||6|
|Journal||Key Engineering Materials|
|Publication status||Published - 1999 Dec 1|
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering