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Preparation and Dielectric Characterization of Lead‐Free Niobate Glass‐Ceramic Composites Added with Lu 2 O 3
Author(s) -
Tian Yuming,
Zhou Yi,
Du Jun
Publication year - 2014
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.13010
Subject(s) - materials science , dielectric , ceramic , composite material , scanning electron microscope , dielectric loss , glass ceramic , crystallization , dissipation factor , doping , mineralogy , chemical engineering , chemistry , optoelectronics , engineering
Lead‐free niobate glass‐ceramic composites added with Lu 2 O 3 were synthesized through melt‐quenching followed by controlled crystallization techniques. X‐ray diffraction and scanning electron microscopy showed that a minor phase determined as LuNbO 4 was formed as the Lu 2 O 3 addition exceeded 1 mol% in the basic glass‐ceramic. The formation of LuNbO 4 was due to the saturation of Lu 3+ doping in the major crystalline phases. Analyses of the dielectric properties and breakdown strength ( BDS ) indicated that they were closely related to the formation of this new minor phase. Although the dielectric constant was not increased continuously, the dielectric loss tangent was well controlled below 0.017, and the BDS increased from 40.2 to 47.2 kV/mm for the glass‐ceramic composites with increasing Lu 2 O 3 addition. This study provided the Lu 2 O 3 added lead‐free niobate glass‐ceramic as an attractive candidate for making high‐energy density capacitors.