Volume 6 Issue 6, Pages 661 – 670

Jia-Jia Gan, Wen-Cheng J. Wei
Published Online: Oct 29 2008 1:06PM

DOI: 10.1111/j.1744-7402.2008.02301.x

Different from conventional powder mixing, this study demonstrates a
method of homogeneous coating for niobia (Nb2O5)
on ferroelectric barium titanate (BaTiO3)
powders. The precipitation of Nb coating with pH has been determined
quantitatively by the inductance-coupled plasma method. Crystalline
phases were determined by X-ray diffractometry, and the formation of a
“core-shell” structure with a Nb concentration gradient was observed by a
transmission electron microscope with X-ray energy-dispersive
spectroscopy. The dielectric constant (K) of the
samples prepared by the nanocoating method showed a more stable
temperature coefficient of capacitance and well satisfied the
requirements of X7R.

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