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Title: Studies of interface characteristics of fine-grain ferroelectric based glass-ceramic composites using impedance spectroscopy
Authors: Zhang, H
Sun, TY
Wang, Y
Kong, LB
Kwok, KW 
Karaki, T
Lam, KH 
Mak, CL 
Hou, F
Keywords: Breakdown strength
Modified hybrid processing
Issue Date: 2016
Publisher: Elsevier
Source: Journal of alloys and compounds, 2016, v. 682, p. 196-202 How to cite?
Journal: Journal of alloys and compounds 
Abstract: High-quality fine-grained ferroelectric glass-ceramic composites were successfully fabricated by using a modified hybrid processing. The properties of interfaces were investigated by using impedance spectroscopy (IS). In our measured impedance spectra, a polarization with an ideal Debye behavior was observed at intermediate frequency ranging between 1 kHz and 100 kHz. This polarization was attributed to the space charge accumulation at the grain-boundary interfaces, due to the presence of large dielectric constant difference between the fillers and the host. Basing on the IS results, a brick-layer microstructural model was proposed for the ferroelectric glass-ceramic composites. Our studies indicated that the new modified hybrid processing can be used to design composites with desired interfaces that have a homogeneous dielectric constant, so as to achieve high breakdown strength, thus leading to high electrical energy density storage devices.
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2016.04.274
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