The effect of low quasi-hydrostatic pressure on the melting temperature of the superconductor Bi2Sr2CaCu2O8+

Microstructure, texture and superconducting properties of Bi2212 ceramics, deformed by torsion under pressure

“…The preservation of the Bi2212 phase until 940°C is due to an increase of the melting temperature of this phase caused by the applied quasihydrostatic pressure. As shown by Imayev et al [18] the melting onset temperature of Bi2212 varies from 941 to 943°C for the pressure range 5-35 MPa. Moreover, the deformation results in formation of a strong texture, verified by the increased intensity of the (0 0 l) peaks.…”

“…Since the samples are kept under quasihydrostatic compression extra oxygen slowly flows out from the samples resulting in a loss of thermal stability and a decomposition of the Bi2212 phase [18]. The outflow of extra oxygen becomes significant at high temperatures (samples 9 and 11) and for the high-torsion tests at hardly lower temperatures (sample 29).…”

“…One of such procedures is torsion under pressure [15] where quasihydrostatic pressure prevents destruction of the material and torsion leads to deformation up to very high strains [16,17]. Recently it has been revealed that applying low quasi-hydrostatic pressure (slightly above 0.6 MPa) increases the onset temperature for melting of Bi2212 by almost 60°C, which essentially expands the useable temperature range for hot deformation [18]. An open question is the influence of the deformation performed near the melting temperature of the Bi2212 phase on structure and on superconducting properties.…”

Effect of magnetic field treatment on the electromagnetic properties of polymer composite based on barium hexaferrite at microwave frequencies

“…One way to change the internal structure of magnetic radiomaterials is magnetic texturing. This method for polycrystalline materials has been known for a long time [9,10,12]. However, this method concerning the production of polymer composite is insufficiently elucidated in literature [13].…”

Electromagnetic properties of Z-hexaferrities composites with magnetic texture

“…These materials must be of low weight, thickness, cost, efficiency, hardness/flexibility, stability and electromagnetic compatibility [1][2][3][4][5]. These properties are characteristic of radar absorbers, protecting and shielding electromagnetic radiation materials.…”