Open AccessInfluence of Bi nonstoichiometry on the energy storage properties of 0.93KNN–0.07BixMN relaxor ferroelectrics
Author(s) -
Xiaoshuang Qiao,
Xiaoshuai Zhang,
Di Wu,
Xiaolian Chao,
Zupei Yang
Publication year - 2018
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x18300062
Subject(s) - materials science , dielectric , energy (signal processing) , ceramic , perovskite (structure) , stoichiometry , grain size , vacancy defect , content (measure theory) , phase (matter) , condensed matter physics , phase transition , analytical chemistry (journal) , thermodynamics , physics , crystallography , mathematics , mathematical analysis , composite material , chemistry , quantum mechanics , optoelectronics , chromatography
Ceramic-based dielectric capacitors are becoming more and more important in electronic devices. The ceramics of 0.93K[Formula: see text]Na[Formula: see text]NbO 3 –0.07Bi x (Mg[Formula: see text]Nb[Formula: see text])O 3 (0.93KNN–0.07Bi x MN) ([Formula: see text], 2/3, 0.75 and 0.95) were successfully fabricated by virtue of the solid reaction process in this work. The results showed that the amount of Bi content has a significant impact on the ceramics of 0.93KNN–0.07Bi x MN. XRD indicates that all specimens exhibit a pure perovskite structure and existing oxygen vacancy in the specimens. The mean grain size for all specimens belong to submicron scale, and the sample of [Formula: see text] owns the smallest grain size is 0.11[Formula: see text][Formula: see text]m. The maximum dielectric constant increases but the phase transition temperature [Formula: see text] exhibits a contrary tendency at 1[Formula: see text]MHz with increasing Bi concentration. Besides, all ceramics are relaxor ferroelectric. The impedance analysis further revealed that the activation energy of the ceramics increases with Bi content. Eventually, the highest [Formula: see text] of 58.8% and [Formula: see text] of 1.30[Formula: see text]J/cm 3 are simultaneously achieved in the sample with [Formula: see text]. Overall, we demonstrate in this work that stoichiometry control of Bi in 0.93KNN–0.07Bi x MN ceramics is a practical method to obtain the desired structural, dielectric and energy storage properties.