Sains Malaysiana 43(9)(2014): 1373–1378
Characterization of Cerate-Zirconate
Ceramics Powder Prepared by Three Different Methods:
A Comparative Study
(Pencirian
Serat-Zirkonat Seramik Serbuk Disediakan oleh Tiga Kaedah yang Berbeza:
Suatu
Kajian Perbandingan)
NAFISAH OSMAN1*, NAJWA ‘ADNI IBARAHIM1,2, MOHD AZLAN MOHD ISHAK1 & OSKAR HASDINOR HASSAN3
1Faculty of Applied
Sciences, Universiti Teknologi MARA, 02600 Arau, Perlis
Malaysia
2Faculty of Applied
Sciences, Universiti Teknologi MARA, 40450 Shah Alam,
Selangor Darul Ehsan, Malaysia
3Faculty of Art and
Design, Universiti Teknologi MARA, 40450 Shah Alam,
Selangor Darul Ehsan, Malaysia
Diserahkan: 15 Mei
2013/Diterima: 1 Mei 2014
ABSTRACT
Ceramics powder of
BaCe0.54Zr0.36Y0.1O2.95 (BCZY)
was synthesized using three different methods namely sol-gel (SG),
supercritical fluid (SC)
and supercritical fluid assisted sol-gel (SCSG).
The respective prepared samples were denoted as S1, S2 and S3. TG thermogram of the dried powders for all samples showed three
stages of weight loss. Each stage was corroborated by one or two exothermic
peaks as shown in DTG signal.
Complete thermal decomposition for all the samples was almost accomplished at
1000°C for about 2 h. At calcination temperature of 1100°C, S1 showed a
single-phase of perovskite-type oxides as proven by XRD result. Morphology of the calcined powders by SEM micrograph showed that S1 is in spherical shape, S2 is in cubic
structure and S3 has a mixture of spherical and rod-like structure. Therefore,
as comparison, SG method
gives better characteristics of cerate-zirconate ceramics powder compared to SC and SGSC.
Keywords:
Cerate-zirconate ceramic; sol-gel; supercritical fluid; supercritical fluid
assisted sol-gel
ABSTRAK
Serbuk seramik BaCe0.54Zr0.36Y0.1O2.95 (BCZY)
telah disintesis menggunakan tiga kaedah yang berbeza iaitu sol-gel (SG),
bendalir lampau genting (SC)
dan bendalir lampau genting dibantu sol-gel (SGSC).
Sampel masing-masing telah ditandakan sebagai S1, S2 dan S3. Isyarat TG bagi semua serbuk
sampel yang dikeringkan telah menunjukkan tiga peringkat kehilangan berat.
Setiap peringkat kehilangan diiringi oleh satu atau dua puncak eksotermik
seperti ditunjukkan oleh isyarat DTG.
Penguraian terma yang lengkap untuk semua sampel didapati hampir sempurna pada
suhu 1000°C selama 2 jam. Pada suhu pengkalsinan 1100°C, S1 menunjukkan satu
fasa tunggal oksida perovksite seperti dibuktikan oleh analisis XRD.
Morfologi serbuk yang dikalsinkan menggunakan mikrograf SEM mendedahkan S1 adalah dalam bentuk sfera, S2 berbentuk kubus dan
S3 adalah campuran bentuk sfera dan rod. Sebagai perbandingan, didapati kaedah
SG memberi ciri serbuk seramik serat-zirkonat yang lebih baik daripada SC dan SGSC.
Kata kunci: Cecair
genting lampau; cecair genting lampau membantu sol-gel; serat-zirkonat seramik;
sol-gel
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*Pengarang untuk
surat-menyurat; email; fisha@perlis.uitm.edu.my
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