Microstructure and dielectric properties of CCTO glass-ceramic prepared by the melt-quenching method

In this work, CaCu3Ti4O12 (CCTO) glass-ceramic was prepared by using the melt-quenching method followed by a two-step heat treatment. The prepared glass frits with the chemical composition of 24SiO2-65PbO-3K2O-7B2O3-1ZnO (wt. %) were mixed with 32, 34 and 38 wt % of CCTO including 14.03 CaO-29.66 Cu...

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Bibliographic Details
Published in:Ceramics international 2019-10, Vol.45 (15), p.19316-19322
Main Authors: Nazari Aliabadi, Tahere, Alizadeh, Parvin
Format: Article
Language:English
Subjects:
CaCu3Ti4O12
Dielectric properties
Glass
Glass-ceramic
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Summary:In this work, CaCu3Ti4O12 (CCTO) glass-ceramic was prepared by using the melt-quenching method followed by a two-step heat treatment. The prepared glass frits with the chemical composition of 24SiO2-65PbO-3K2O-7B2O3-1ZnO (wt. %) were mixed with 32, 34 and 38 wt % of CCTO including 14.03 CaO-29.66 CuO-56.31 TiO2 (wt. %) and melted at 1070-1090°C. The glass with 32 wt % of CCTO, which was XRD amorphous, was selected as the final composition. The heat treatment conditions were found to be 6 and 2 h at 468 °C and 830 °C, respectively. The faceted crystals of CCTO, two solid-solution of (Pb1-xCax)TiO3, and CaTiO(SiO4) were formed in the glassy matrix during the crystallization based on the studies related to XRD, SEM, EDS, and elemental mapping in the glass-ceramic. The measured dielectric constant of the glass was 16.3 at 1 MHz, which reached 41.2 after the heat treatment process, and the value of the tanδ increased from 4.6×10−5 to 0.012.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2019.06.182