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: hasmaliza@usm.my

 

Abstract

 

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

 

References

[1].             Hing P, Sinha V, Ling PB, J. Mater. Process. Technol 63 604-609 (1997)

[2].             Shi ZM, Liang KM, Gu SJ, Mater. Lett. 51 68-72 (2001)

[3].             Tomba AG, Camerucci MA, Cavalieri AL, J. Eur. Ceram. Soc. 26 2527-2531(2006)

[4].             Torres FJ, Alarcon LJ, J. Eur. Ceram. Soc. 23 (6) 817-826(2003)

[5].             Bouzerara F, Harabi A, Achour S, Larbot A, J. Eur. Ceram. Soc. 26 1663-1671 (2006)

[6].             Yalamac E, Akkurt S, Ceram. Int. 32 825-832 (2006)

[7].             Banjuraizah J, Mohamad H, Ahmad ZA, J. Alloys Compd. 494 256-260 (2010)

[8].             Cheng CM, Yang CF, Lo SH, Ceram Int. 25 581-586 (1999)

[9].             Chen GH, J. Alloys Compd. 455 298-302 (2008)

[10].           Camerucci MA, Urretavizcaya G, Cavalieri AL, Ceram Inter, 29 159-168 (2003)