Preparation and properties of barium titanate glass-ceramics sintered from sol–gel-derived powders |
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Authors: | KUI Yao Liangying Zhang Xi Yao Weiguang Zhu |
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Affiliation: | (1) Electronic Materials Research Laboratory, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China;(2) Microelectronic Center, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798 |
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Abstract: | Homogeneous Ba–Ti–B–Si, Ba–Ti–Al–Si and Ba–Ti–B gels have been successfully prepared by the sol–gel process. A novel method
is presented for fabricating barium titanate glass-ceramics by sintering the gel powders with small barium titanate crystallites.
The structural development, grain size, crystallization process and dielectric properties were systematically studied by differential
thermal analysis, thermogravimetric analysis, X-ray diffraction techniques, scanning electron microscopy and dielectric measurements.
The glass-ceramic samples were sintered at lower temperatures compared to the barium titanate ceramic sintering, and showed
improved dielectric properties. It was found that the small size effect of the barium titanate grains on the dielectric constant
in the glass-ceramics was quite evident. Ferroelectric hysteresis loop analyses were also performed to manifest the ferroelectric
nature of the barium titanate grains in situ grown from the gels.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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