Dolomite Addition in Non-Stoichiometric Cordierite Glass-Ceramic: Effects on Dielectric Constant


M. Hasmalizaa, A.A. Zainala and I. Norfadhulahb


a Structural Materials Niche Area,

School of Materials and Mineral Resources Engineering,

Universiti Sains Malaysia Engineering Campus,

14300 Nibong Tebal, Penang, Malaysia.


b Faculty of Earth Science, Universiti Malaysia Kelantan Kampus Jeli,

Karung Berkunci No.100, 17600 Jeli,Kelantan, Malaysia


Corresponding author:




Glass-ceramic was successfully synthesis using glass route by dolomite addition in cordierite (MgO-SiO2-Al2O3) using natural mineral kaolin and talc. The raw materials have been dictated due to their natural abundance (low price) and their beneficial properties. In this study, non-stoichiometric cordierite glass xCaO.(21-x)MgO.26Al2O3.53MgO was melt at 1540C followed by quenching process. The quenched glass was milled to < 3 m and was used to prepare glass ceramic. The phase evolution and physical properties of the samples sintered at 980C for 2 hour was characterized. It is found that when dolomite addition (x < 3), the predominant phase in glass ceramics was found to be α-cordierite and the secondary crystalline phase to be forsterite. Anorthite start to appear when x = 5 and subsequently increased when x = 10. The dielectric constant of the samples increases by addition of dolomite. However, when x = 10, the dielectric constant decreases. The results shows that, a dense and low dielectric loss glass ceramic with predominant crystal phase of α-cordierite and some amount of anorthite was achieved using fine glass powders from talc and kaolin with an addition of dolomite.


Keywords: α-Cordierite; dolomite; rietvield quantitative; electrical properties



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