Investigation on the Effect of Mn on the Dielectric Properties of Ba0.4Sr0.6TiO3/MgAl2O4/MgO Composite Ceramics
xMnCO3–(1–x)[70wt% (10wt% MgO–90wt% Ba0.4Sr0.6TiO3)–30wt% MgAl2O4] (where x=0.0, 0.5, 1.0, 2.0, 5.0 and 10.0wt%) composite ceramics have been prepared through the solid-state reactions. Three phases, corresponding to the Ba0.4Sr0.6TiO3(BST), MgAl2O4(MA) and MgO phases, are clearly visible in the composite ceramics. The permittivity peak is initially enhanced and shifted toward a higher temperature and then suppressed, shifted toward a lower temperature. Meanwhile, the tunability (calculated by [ε(E0)−ε(E)]/ε(E0)) is also initially improved and then decreased by doping MnCO3.
Tadashi Takenaka, Hajime Haneda, Kazumi Kato, Masasuke Takata and Kazuo Shinozaki
J. J. Zhang et al., "Investigation on the Effect of Mn on the Dielectric Properties of Ba0.4Sr0.6TiO3/MgAl2O4/MgO Composite Ceramics ", Key Engineering Materials, Vols. 421-422, pp. 65-68, 2010