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Barium-doped Ca 2 Nb 2 O 7  ceramics were prepared in the form of Ca[Formula: see text]Ba x Nb 2 O 7  (0 [Formula: see text] 0.6) by solid-state reaction. The solubility limit of barium in Ca 2 Nb 2 O 7  was found to be [Formula: see text] based on X-ray diffraction and Raman spectroscopy analysis. When [Formula: see text] 0.4, Ca[Formula: see text]Ba x Nb 2 O 7  solid solutions with a monoclinic perovskites-like layered structure (PLS) were formed, whereas beyond [Formula: see text], a secondary phase CaNb 2 O 6  was detected. The dielectric properties obviously depended on the barium substitution. With increasing barium amount, the dielectric constant increased from 33.5 for pure Ca 2 Nb 2 O 7  to 38.6 for [Formula: see text] ([Formula: see text][Formula: see text]MHz). The Curie temperature ([Formula: see text] of the [Formula: see text] sample was 1280[Formula: see text][Formula: see text][Formula: see text]5[Formula: see text]C. The phase transition was confirmed to be the second order.

Effects of barium substitution on the sintering behavior, dielectric properties of Ca2Nb2O7 ferroelectric ceramics

Effects of barium substitution on the sintering behavior, dielectric properties of Ca₂Nb₂O₇ ferroelectric ceramics