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Novel Core–Shell Nanostructure in Percolative PZN−PZT/Ag Ferroelectric Composites
Author(s) -
Zheng Mupeng,
Hou Yudong,
Fan Xinwei,
Zhu Mankang
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13314
Subject(s) - dielectric , materials science , composite material , ferroelectricity , nanostructure , nanocomposite , ceramic , dielectric loss , polarization (electrochemistry) , nanoscopic scale , nanoparticle , core (optical fiber) , nanotechnology , optoelectronics , chemistry
Novel percolative PZN − PZT / Ag ferroelectric composites with intragranular structure were prepared with micro‐ PZN − PZT and nano‐ Ag particles. The typical core–shell nanostructures were systematically investigated by TEM , in which, the nanoscale shells act as interlayers between the Ag cores and the ceramic matrix. Excellent dielectric properties, such as high dielectric constant (ε r ~16600) and low dielectric loss (< 0.056) were reported. The high dielectric constant originates from the coeffect of “microcapacitors” and Maxwell–Wager–Sillars ( MWS ) polarization. Especially, the core−shell structure may reinforce the MWS effect. Meanwhile, the insulating interlayers reduce the tunnel current between neighboring Ag cores by causing potential barriers, endowing the nanocomposites with low dielectric loss. This approach can be used to realize a novel material with high dielectric constant over a wide frequency and temperature range.