Abstract
New dielectric composite ceramics Na0.5Bi0.5TiO3–Ba(1–x)Sr x Ti0.995Zr0.005O3 (NBT–BSTZ) ( x= 0.05, 0.1, 0.2, 0.3) have been fabricated by the wet solid-state route. The effect of Sr content on phase structure and electrical properties has been studied in detail. The X-ray diffraction analysis illustrates that the composites consist of tetragonal perovskite. With increasing Sr content, the ceramic capacitors display larger dielectric constant, better temperature stability, and lower dielectric loss in dielectric behavior. The ceramics with composition x = 0.3 possess a large dielectric constant (er) of 2522. The temperature coefficient of capacitance of NBT–BSTZ varies from –39% to 36% in the temperature range between 0 and 200°C. The dielectric loss of capacitance is below 0.07 while the Sr content is 0.3 in the whole range of measured temperatures. The results indicate that Sr-doping is an effective method to modulate the temperature stability and dielectric loss of the NBT– BSTZ dielectric ceramics.
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