The Reaction Sequence and Dielectric Properties of BaAl2Ti5O14 Ceramics

Xiaogang Yao, Wei Chen, Lan Luo
2012 Advances in Materials Physics and Chemistry  
To investigate the correct reaction sequence of BaO-Al 2 O 3 -5TiO 2 system, powders calcined at different temperatures are analyzed by x-ray diffraction. The results show that the source phase BaCO 3 decomposes below 800°C, TiO 2 and Al 2 O 3 start to consume at 900 and 1100°C, respectively. BaTi 4 O 9 phase appears at 1000°C while BaAl 2 Ti 5 O 14 phase starts to reveal at 1200°C. As the temperature increases, the density, dielectric constant and quality factor of the BaAl 2 Ti 5 O 14 ceramic
more » ... 2 Ti 5 O 14 ceramic increase and keep unchanged at 1350°C. The dielectric properties of BaAl 2 Ti 5 O 14 ceramic sintered at 1350°C for 3h are: ε r =35.8, Q×f=5130GHz, τ f =-6.8ppm/°C.
doi:10.4236/ampc.2012.24b008 fatcat:vwusxzb3p5a45jbkuqqu44dpqe