Improved dielectric properties of Ba_xSr_(1-x)TiO_3-based composite ceramics derived from core-shell structured nanopowders

摘要

We performed a study on the dielectric properties of Ba_xSr_(1-x)TiO_3-Mg_(0.9)Zn_(0.1)O (BST-MZO) composite ceramics derived from core-shell structured nanopowders with the shell of zinc doped MgO and core of Ba_xSr_(1-x)TiO_3.It was found that the ceramics exhibit a significant improvement in dielectric response under a DC electric field.The Curie temperature decreases more significantly in the BST-MZO composite ceramics compared to that of pure BST ceramics.The tunability of Ba_(0.75)Sr_(0.25)TiO_3-40%MZO is 23.49% at 20 deg C.The dielectric properties at high frequency also show low dielectric constant and great reduction in dielectric loss.These ceramics are expected to be useful in microwave devices.