Open AccessEnhanced dielectric and ferroelectric characteristics in Ca-modified BaTiO3 ceramics
Author(s) -
Xiao Na Zhu,
Wei Zhang,
Xiang Ming Chen
Publication year - 2013
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4819482
Subject(s) - dielectric , materials science , ferroelectricity , ceramic , curie temperature , dielectric loss , ferroelectric ceramics , grain size , analytical chemistry (journal) , high κ dielectric , mineralogy , composite material , condensed matter physics , chemistry , optoelectronics , physics , chromatography , ferromagnetism
Synergic modification of BaTiO3 ceramics was investigated by Ca-substitution, and the superior dielectric and ferroelectric properties were determined together with the structure evolution. X-ray diffraction (XRD) analysis demonstrated a large solubility limit above x = 0.25 in Ba1−xCaxTiO3 solid solution where the fine grain structure was observed with increasing x. Room temperature dielectric constant as high as 1655 was achieved in the present ceramics together with the significantly reduced dielectric loss of 0.013 (x = 0.20 at 100 kHz), where the Curie temperature kept almost a constant while other two transition temperatures decreased continuously with increasing x. More importantly, the remanent polarization Pr and dielectric strength Eb were significantly enhanced by Ca-substitution, and the best Pr (11.34 μC/cm2) and the highest dielectric strength Eb (75 kV/cm) were acquired at x = 0.25. The present ceramics should be very desirable for the applications such as high density energy storage devices