The effects of TiO 2 and SnO 2 additives on the sinterability and the microwave dielectric properties of Ba(Mg 1/3Ta 2/3)O 3 (BMT) ceramics were investigated. X-ray diffraction and electron probe microanalysis results implied that Ti +4 and Sn +4 ions substituted for the Ta +5 ions in BMT. The splitting of the (422) and (226) peaks was significantly reduced when the contents of the additives exceeded 1.0 mol%, indicating a decrease of 1 : 2 ordering. The grain size, the relative density, the dielectric constant and the Q-value of BMT increased with the addition of a small amount of TiO 2 (or SnO 2). However, a large addition of TiO 2 or SnO 2 reduced the relative density, the dielectric constant, and the Q-value of BMT. The temperature coefficient of the resonant frequency (TC f) of BMT increased with the addition of TiO 2 and decreased with the addition of SnO 2. The following values were obtained with a 0.2 mol% TiO 2 addition: ε r=24.9, Q × f 0≃100,000 (f o = 8 GHz), and TC f=8.7 ppm/°C.
|Journal||Journal of the Korean Physical Society|
|Issue number||SUPPL. 2|
|Publication status||Published - 1999|
ASJC Scopus subject areas
- Physics and Astronomy(all)