Solid State Science and Technology, Vol. 17, No 2 (2009) 182-188
Corresponding Author: email@example.com
DIELECTRIC PROPERTIES OF STRONTIUM TITANATE FILLED
MULLITE COMPOSITES AT 10 Hz - 1 MHz
Alex See, Jumiah Hassan, Mansor Hashim,
Abdul Halim Shaari and W. Mohd. Daud W. Yusoff
Physics Dept. Faculty of Science, Universiti Putra Malaysia,
43400 UPM, Serdang Malaysia
This research was designed to form better dielectric composite material using one steady state dielectric (mullite) with a good dielectric material (strontium titanate). Distinct dielectric composites were successfully produced using locally sourced kaolinite clay. The samples were made using mullite as the base matrix and strontium titanate (ST) added at varying ratios. Strontium titanate was synthesized via solid-state reaction using strontium carbonate and rutile titanium (IV) oxide sintered at 1300°C. Local white kaolinite was used to fuse the strontium titanate material at varying weight ratios. The powders were dry-mixed and made into pellets for calcination at 1000°C. XRD and SEM characterizations were made. The dielectric measurements were carried out using the HP 4192A LF Impedance Analyzer dielectric setup in the frequency range of 10 Hz to 1 MHz. Three samples were prepared, namely ST 60%, ST 70% and ST 80%. The dielectric measurements were carried out in a controlled LT furnace at 30°C - 400°C. Measurements showed distinct varying interfacial encapsulation and dipolar relaxation for all composite samples.
. Cornelius Klein and Barbara Dutnow, 2008, The 23rd Ed.of the Manual of
Mineral Science, 23rd Ed., John Wiley and Sons, New Jersey, 521- 523.
. X.Y. Fang, O.K. Tan, Q. Wei, M.W. Yao, and S.C. Tjin, 2006, Sensors and
Actuators B, No. 119, 78–83
. Janusz Nowotny, 1992, Electronic Ceramic Materials, Trans Tech Publications,
. Rex W. Grimshaw, 1971,The Chemistry and Physics of Clay and Allied
Ceramic Material, 4th Ed., Wiley Interscience, London, 723-727.
. S.A. Howard, J.K. Yau and H.U. Anderson, 1989, J. Appl. Phys., 65,
1492.(Under PAnalytical Database)
. W. D. Kingery, H. K. Bowen and D. R. Uhlmann, 1960, Introduction to
Ceramics, 2nd Ed. John Wiley and Sons, New York, 419- 420.
. Rex W. Grimshaw, 1971, The Chemistry and Physics of Clay and Allied
Ceramic Material, 4th Ed., Wiley Interscience, London, 446-448.
. H. Schneider and S. Komarneni (editors), 2005, Mullite, Wiley-VCH,
. V.S.Nisa, S.Rajesh, K.P.Murali, V.Priyadarsini, S.N.Potty and R.Ratheesh,
2008, Preparation, Characterization and Dielectric Properties of Temperature
Stable SrTiO3/PEEK composites for microwave substrate applications,
Composite Science and Technology, 68, 106-112.
. S. Somiya and Y.Hirata, 1991, Mullite Powder Technology and Application in
Japan, Amer. Ceram. Soc. Bull., 70, 1624-1632.