Open AccessMicrostructure and dielectric properties of sub‐micron hollow sphere (Ba 0.6 Sr 0.4 )TiO 3 /PVDF composites
Author(s) -
Guo Yiting,
Zhang Kena,
Meng Nan,
Wu Wanli,
Wang Yujian,
Xu Jie,
Pawlikowska Emilia,
Szafran Mikołaj,
Gao Feng
Publication year - 2019
Publication title -
iet nanodielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.23
H-Index - 9
ISSN - 2514-3255
DOI - 10.1049/iet-nde.2019.0013
Subject(s) - materials science , dielectric , composite material , microstructure , composite number , particle size , dielectric loss , particle (ecology) , chemical engineering , optoelectronics , oceanography , engineering , geology
Hollow sphere (Ba 0.6 Sr 0.4 )TiO 3 (HS‐BST) powders with sub‐micron size and different shell thickness were synthesised through template‐assisted method. HS‐BST/poly(vinylidene fluoride) (PVDF) composites were prepared using tape casting method. The effects of particle size and shell thickness of HS‐BST on the microstructure, dielectric tunability, and energy storage properties of HS‐BST/PVDF composites were investigated. Results showed that all HS‐BST particles were uniformly dispersed in PVDF matrix without agglomeration. With decreasing the size of HS‐BST particles, the dielectric constant and loss of HS‐BST/PVDF composites decreased, while the breakdown strength initially decreased and then increased. In addition, the theoretical model of the dielectric tunability of inorganic/organic system related to the shape factor ( n ) of inorganic particles was used to simulate and n value of 0‐dimensional spherical particles was estimated. For HS‐BST/PVDF composite, the n in the model was 2–2.5, corresponding to HS‐BST particles with a diameter ranging from 0.44 to 2.57 μm, and a shell thickness ranging from 40 to 500 nm.