Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 25, Issue 3, Pages 350-356Publisher
SPRINGER
DOI: 10.1007/s12613-018-1578-7
Keywords
ceramics; cullet glass; paper ash; wollastonite; structural properties; dielectric properties
Categories
Funding
- Ministry of Higher Education, Universiti Teknologi Malaysia [08H42, 4F752]
- Universiti Kebangsaan Malaysia
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Novel ceramics from waste material made of (x) paper ash-(80 - x) cullet-20 kaolin clay (10wt% <= x <= 30wt%) were successfully synthesized using a conventional solid-state reaction technique. Energy-dispersive X-ray analysis confirmed the presence of Si, Ca, Al, and Fe in the waste material for preparing these ceramics. The influence of the cullet content on the phase structures and the dielectric properties of these ceramics were systematically investigated. The impedance spectra were verified in the range from 1 Hz to 10 MHz at room temperature. The phase of the ceramics was found to primarily consist of wollastonite (CaSiO3), along with minor phases of gamma-dicalcium silicate (Ca2SiO4) and quartz (SiO2). The sample with a cullet content of 55wt% possessed the optimum wollastonite structure and exhibited good dielectric properties. An increase of the cullet content beyond 55wt% resulted in a structural change from wollastonite to dicalcium silicate, a decrease in dielectric constant, and an increase in dielectric loss. All experimental results suggested that these novel ceramics from waste are applicable for electronic devices.
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