ScienceAsia 27 (2001) : 239-243 |doi: 10.2306/scienceasia1513-1874.2001.27.239

Effect of Calcination Temperature on Phase Transformation and Particle size of Barium Titanate Fine Powders Synthesized by the Catecholate Process

Wongduan Maison^a,*, Supon Ananta^b, Tawee Tunkasiri^b, Prasak Thavornyutikarn^a and Sukon Phanichphant^a

ABSTRACT: A modified catecholate process has been developed for the synthesis of high purity barium titanate fine powders. The barium titanium-catechol complex, Ba[Ti(C₆H₄O₂)₃] was prepared from TiCl₄, C₆H₄(OH)₂ and BaCO₃. The complex was freeze-dried and calcined for 3 hours at temperatures ranging from 700 to 1100 ^oC. Phase transformation and particle size of the calcined powders have been investigated as a function of calcination temperature by room-temperature X-ray diffraction and scanning electron microscopy techniques. It is seen that the perovskite-like phase of BaTiO₃ was successfully obtained. With increasing calcining temperature, BaTiO₃ transformed from the cubic to the tetragonal phase. Higher temperatures clearly favoured particle growth and the formation of large and hard agglomerates. After calcination at 700 ^oC, the average particle size ranged between 0.1-0.2 m.

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a Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
b Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.

* Corresponding author, E-mail: maison202@hotmail.com

Received 13 Sep 2000, Accepted 8 Jun 2001