The Effect of the Pressure for the Formation of YBa2Cu3O7–d Bulk Ceramics with Domestic Microwave Oven

Abstract

We fabricated YBa 2 Cu 3 O 7-d bulk ceramics with a domestic microwave oven and investigated the effect of pressure at the press procedure. If the pressure was not high enough, the ratio of BaCuO 2 phase became large, estimated from x-ray diffraction (XRD) measurements. We found that the pressure should be 700 kgf/cm 2 at least in order to suppress the BaCuO 2 phase.

Effects of Forming Pressure on Physicochemical Properties of YBCO Ceramics

“…Currently, the work is focused on improving the efficiency of the process of obtaining this superconductor and reducing production costs. Many modifications of this process are also proposed, e.g., the use of weak microwaves during YBCO synthesis, the replacement of BaCO 3 with BaO [17].…”

“…There has been virtually no works on the dependence of properties on the technological parameters of obtaining solid YBCO material. One of the few works is that of Ohmukai [17], which dealt with microwave annealing and studied the influence of pressure during YBCO molding in the range of 80-2000 kgf cm −2 (about 7. . He concluded that in order to minimise the undesirable phase of BaCuO 2 in YBCO, the pressure should be 700 kgf cm −2 (about 68.6 MPa) [17].…”

“…Ohmukai [17] studied the effect of molding pressure on properties of the YBCO ceramics obtained during the use of the microwave method. Al-Shibani [23] studied the effect of molding pressure on the structural and physical properties of YBCO obtained by conventional calcination.…”