Calcium-doped MgTiO3–MgTi2O5 ceramics prepared using a reaction-sintering process

Calcium-doped MgTiO3-MgTi2O5 (MCT) ceramics prepared using a reaction-sintering process were investigated. Without any calcination involved, the mixture of MgO, CaCO3, and TiO2 was pressed and sintered directly. MCT ceramics were obtained after 2-6h sintering at 1150-1250 deg C. MCT containing high...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2007-09, Vol.142 (2-3), p.116-120
Main Authors: Liou, Yi-Cheng, Yang, Song-Ling
Format: Article
Language:English
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Summary:Calcium-doped MgTiO3-MgTi2O5 (MCT) ceramics prepared using a reaction-sintering process were investigated. Without any calcination involved, the mixture of MgO, CaCO3, and TiO2 was pressed and sintered directly. MCT ceramics were obtained after 2-6h sintering at 1150-1250 deg C. MCT containing high percentage of MgTi2O5 phase (45.6%) was observed at 1150 deg C/2h sintering and the percentage decreased to 37.2% at 1300 deg C/2h sintering. The maximum density 3.85g/cm3 could be obtained at 1250 deg C. Dielectric constant at 10MHz reaches 23.7-25.9 in MCT ceramics sintered at 1150 and 1200 deg C. r=22.4 and QXf40,400GHz (at 9.8GHz) and a tauf value of -9.6ppm/ deg C were obtained in MCT ceramic sintered at 1300 deg C/2h. The reaction-sintering process has been proven a simple and effective method to produce dense MCT ceramics with good dielectric properties even without the addition of sintering aid.
ISSN:0921-5107
DOI:10.1016/j.mseb.2007.06.027