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The Reaction Sequence and Dielectric Properties of BaAl2Ti5O14 Ceramics

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DOI: 10.4236/ampc.2012.24B008    2,774 Downloads   4,068 Views   Citations

ABSTRACT

To investigate the correct reaction sequence of BaO-Al2O3-5TiO2 system, powders calcined at different temperatures are analyzed by x-ray diffraction. The results show that the source phase BaCO3 decomposes below 800°C, TiO2 and Al2O3 start to consume at 900 and 1100°C, respectively. BaTi4O9 phase appears at 1000°C while BaAl2Ti5O14 phase starts to reveal at 1200°C. As the temperature increases, the density, dielectric constant and quality factor of the BaAl2Ti5O14 ceramic increase and keep unchanged at 1350°C. The dielectric properties of BaAl2Ti5O14 ceramic sintered at 1350°C for 3h are: εr=35.8, Q×f=5130GHz, τf=-6.8ppm/°C.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

X. Yao, W. Chen and L. Luo, "The Reaction Sequence and Dielectric Properties of BaAl2Ti5O14 Ceramics," Advances in Materials Physics and Chemistry, Vol. 2 No. 4B, 2012, pp. 28-30. doi: 10.4236/ampc.2012.24B008.

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