Microwave assisted sol-gel synthesis of high dielectric constant CCTO and BFN ceramics for MLC applications

作者：Sonia; Chandrasekhar Mallam; Kumar Pawan

来源：Processing and Application of Ceramics, 2017, 11(2): 154-159.

DOI：10.2298/PAC1702154C

<jats:p>Ba(Fe1/2Nb1/2)O3 (BFN) and CaCu3Ti4O12 (CCTO) ceramic powders were
synthesized by microwave assisted sol-gel synthesis technique and sintered
at 1100?C and 1000?C, respectively. Calcination and sintering processes
were carried out in a microwave furnace. Dielectric constant (?r)~2450 and
dielectric loss (tan ?)~0.5 at frequency of 1 kHz and 20?C were observed
for the BFN ceramic samples. Higher value of ?r ~ 3600 and lower value of
tan ? ~ 0.07 at frequency of 1 kHz and in 20-60?C temperature range for the
CCTO ceramic samples suggested its utility for MLC applications. Sharp
decrease of ?r and sharp increase of tan ? at higher frequencies of BFN
ceramic samples indicated the presence of Debye like relaxation.</jats:p>

• 出版日期2017