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Here we report the processing of cellular, high-temperature polymers for electret applications based on polyetherimide (PEI) and polyetheretherketone (PEEK). The two approaches were utilized to improve the electret properties by insertion of cavities are the physical batch foaming process using carbon dioxide as the blowing agent and the stretching of polymeric plates containing suitable particles,...
Abstract.With the overall critical current density, Jc, remaining low for PbMo6S8, the addition of 0.3at.% Sn noticeably improved the performance. The enhancement occurs despite the presence of excess Pb and a slightly suppressed Tc. The increase in Jc can be attributed to a better homogeneity with respect to the chemical composition of the samples, which may be as a consequence of Sn substitution...
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