Sains Malaysiana 38(1): 103-107(2009)

Heat Treatment And Characterization of Yb Doped Barium

 Cerate Prepared via Sol-Gel Technique

(Rawatan Haba dan Pencirian Barium Serat Terdop Yb yang

disediakan Melalui Teknik Sol-Gel)

Nafisah Osman*, Ibrahim Abu Talib** & Hamidi Abd Hamid

Faculty of Applied Sciences

Universiti Teknologi MARA

02600 Arau, Perlis, Malaysia

**Faculty of Science & Technology

Universiti Kebangsaan Malaysia

43600 Bangi, Selangor, Malaysia

Received:  24 March 2008 / Accepted: 10 May 2008

ABSTRACT

The BaCe_0.95Yb_0.05O_2.975 compound was successfully prepared by the sol-gel method using metal acetate salts as starting materials. Fourier transform infrared (FTIR) results showed that the carbonate ions residue almost disappeared at calcination temperature of 1300 ^oC. Particles size of the final calcined powder obtained from particle size distribution was in the range of 300-450 nm. Diameter of grains for the sintered pellet (relative density ≈85 %) obtained from scanning electron microscope was between 2-5 μm. It is interesting to note that eliminating the carbonate ions residue  enhanced the mechanical and chemical stability of the sample.

Keywords: Yb-doped BaCeO₃; sol-gel method; microstructure; mechanical stability

ABSTRAK

Sebatian BaCe_0.95Yb_0.05O_2.975 telah berjaya disediakan melalui kaedah sol-gel menggunakan garam berasaskan asetat. Keputusan daripada spektroskopi transformasi Fourier infra-merah (FTIR) menunjukkan bahawa sisa ion karbonat hampir dapat disingkirkan pada suhu kalsinan 1300 ^oC. Saiz partikel bagi serbuk yang di ambil pada tahap akhir proses kalsinan didapati berada pada julat 300-450 nm. Diameter butiran bagi pellet yang di sinter (ketumpatan relatif ≈85 %) yang diperolehi dari mikroskop imbasan elektron adalah berada di antara 2-5 μm. Adalah menarik untuk di nyatakan bahawa dengan menyingkirkan sisa ion karbonat telah didapati meningkatkan kestabilan mekanik dan kimia sampel.

Kata kunci: BaCeO₃ terdop Yb; kaedah sol-gel; mikrostruktur; kestabilan mekanik

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*Pengarang untuk surat menyurat