Abstract
Acceptor (Mn-, Co-) doped and donor Y-doped Ba 0.6Sr 0.4TiO 3 have been prepared by traditional ceramic processing and their structural, surface morphological, dielectric and tunable properties were investigated. The results show all dopants to have a strong effect on the average grain size. The curie temperature of all doped specimens decreases and their temperature spectrum broadens. Loss tangent at 15 °C and low frequency (10 kHz) increases for all doped specimens whereas the loss tangent at high frequency (100 MHz) is not affected. The tunability of all the doped specimens is lower than the undoped one.
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