FETEIRA, Antonio, SINCLAIR, Derek C. and LANAGAN, Michael T. (2007). Structural and electrical characterization of CeAlO[sub 3] ceramics. Journal of Applied Physics, 101 (6), 064110.Full text not available from this repository.
The crystal structure and electrical properties of CeAlO3 ceramics prepared by the mixed oxide route have been investigated. X-ray and electron diffraction data show the room temperature structure to be described by the tetragonal I4/mcm space group [a = 5.3253(5) Å and c = 7.5860(9) Å; Z = 4, and theoretical density, Dx = 6.64 g/cm3]. CeAlO3 ceramics sintered at 1500 °C under flowing 5%H2–95%N2 gas for 4 h reach ∼ 94% of Dx with a microstructure of randomly distributed equiaxed grains of average grain size ∼ 2 μm. Conventional transmission electron microscopy reveals needle-shaped ferroelastic domains in some grains. The relative permittivity εr of CeAlO3 ceramics is ∼ 18–20 in the range of ∼ 10–300 K. At room temperature and microwave frequencies, CeAlO3 ceramics exhibit εr ∼ 20.7, Qfr ∼ 40 117 GHz (at 9.5 GHz), and τf ∼ −57 ppm/K. The ion polarizability for Ce3+ is calculated to be 4.46 Å3. Revised dielectric polarizabilities for rare-earth lanthanides are also presented.
|Research Institute, Centre or Group:||Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology|
|Depositing User:||Hilary Ridgway|
|Date Deposited:||06 Jun 2012 16:19|
|Last Modified:||06 Jun 2012 16:19|
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