Synthesis and Electric Property of CeAlO₃ Ceramics

Abstract

Cerium monoaluminate (CeAlO3) ceramics were synthesized at 1350–1500°C in a reducing atmosphere with H3BO3 as flux and characterized of their structural and electric properties. Pellets of such ceramics, sintered at 1400°C or above, showed a perovskite-like tetragonal structure with a density higher than 92% of its theoretical. These ceramic pellets were found to have a large dielectric constant higher than 600 and a small loss tangent lower than 0.04 in the frequency range of 10 kHz to 10 MHz. This sample also showed an electric conductivity of 4.71×10-9 S/cm and an optical bandgap width of 3.29 eV at room temperature.

Enhancement of Photoluminescence in CaTiO3:Pr3+ by Ba and Sr Substitution for Ca

“…The (1 À x)CaTiO 3 -xBaTiO 3 systems were studied early for their excellent dielectric and piezoelectric properties, 14,15) in which insolubility or a diphasic coexistence region was formed when x is 10-80%. Our recent research also showed a similar result; 16) we noted that the Pr doped BaTiO 3 based tetragonal phase scarcely has luminescence. For that reason, Ba addition was limited to 10% in our experiments (one more sample of x ¼ 0:2 was prepared for comparison).…”

CeAlO[sub 3] Nanowire Arrays in Porous Anodic Alumina Templates

“…12,13 Shelykh et al 14 reported a surprisingly high dielectric constant, r , of 3000-10 000 measured at a frequency of 1 kHz. Wang et al 15 reported that CeAlO 3 exhibits r Ͼ 600 in the frequency range of 10 kHz-10 MHz, which is of importance for ferroelectrical applications ͑e.g., resonators and antennas͒. 16 In general, intrinsic r values in excess of ϳ100 require some form of dipolar polarization mechanism in addition to the electronic and ionic polarizabilities.…”