Preparation and magnetic properties of barium ferrites substituted with manganese, cobalt, and tin

Barium ferrites substituted by Mn–Sn, Co–Sn, and Mn–Co–Sn with general formulae BaFe12−2xMnxSnxO19 (x=0.2–1.0), BaFe12−2xCoxSnxO19 (x=0.2–0.8), and BaFe12−2xCox/2Mnx/2SnxO19 (x=0.1–0.6), respectively, have been prepared by a previously reported co-precipitation method. The efficiency of the method was refined by lowering the reaction temperature and shortening the required reaction time, due to which crystallinity improved and the value of saturated magnetization increased as well. Low coercivity temperature coefficients, which are adjustable by doping, were achieved by Mn–Sn and Mn–Co–Sn doping. Synthesis efficiency and the effect of doping are discussed taking into account accumulated data concerning the synthesis and crystal structure of ferrites.

How to watch television? Pedagogy and paedocracy in Beckett’s television plays

This article responds to scholarship on Beckett’s television plays that regards them as positive interventions which encourage the viewer to reconsider the conventions of the medium, and that raise the cultural standards of television drama. In making claims about how the plays address and educate their viewers, critical approaches shift between conceptions of audience. This analysis of Beckett’s plays on British television reconsiders their aesthetic strategies, their relationship with television culture, and the dominant assumptions of critical writing about them by examining the parallel between conceptions of the audience and conceptions of the child in writing about television and Beckett’s television plays.