Studies of interface characteristics of fine-grain ferroelectric based glass-ceramic composites using impedance spectroscopy

Hongfang Zhang, Tie Yu Sun, Yu Wang, Ling Bing Kong, Kin Wing Kwok, Tomoaki Karaki, Kwok Ho Lam, Chee Leung Mak, Fang Hou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)196-202
Number of pages7
JournalJournal of Alloys and Compounds
Volume682
DOIs
Publication statusPublished - 15 Oct 2016

Keywords

  • Breakdown strength
  • Glass-ceramics
  • Impedance
  • Interface
  • Modified hybrid processing

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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