A fine-grained and low-loss X8R (Ba1-xDyx) (Ti1-x/2Cax/2)O3 ceramic

(Ba1-xDyx) (Ti1-x/2Cax/2)O-3 (BDTC) ceramics were prepared at 1400 degrees C using the solid-state reaction method. The solubility limit was determined by XRD to be x =0.15. The BDTC ceramic with x =0.10 exhibited a high relative density (95%), a fine-grained microstructure (1.2 mu m), X8R dielectric stability (vertical bar(epsilon' - epsilon'(RT)vertical bar/epsilon'(RT) <= 15% in a range -55 to 150 degrees C), and a lower loss (tan delta < 0.02) below 2 x 10(4) Hz. Ferroelectric and paraelectric phases coexist in a wide temperature region. The mixed A and B occupancy for Dy3+ and Ca2+ ions was proposed to be responsible for the X8R stability associated with double diffused dielectric peaks. (C) 2018 Elsevier B.V. All rights reserved.