Title :
Particle size dependent high frequency dielectric properties of barium titanate
Author :
McNeal, Mark P. ; Jang, Sei-Joo ; Newnham, Robert E.
Author_Institution :
Intercollege Mater. Res. Lab., Pennsylvania State Univ., University Park, PA, USA
Abstract :
Dielectric measurements on BaTiO3 ceramics and BaTiO 3 powder-polypropylene composites were carried out through microwave frequencies using various techniques. Ceramic BaTiO3 exhibited a large relaxation with a peak in the loss occurring at 776 MHz. Dielectric dispersion was also evident in the composites fabricated with ~1 μm TAM HPB BaTiO3 powder, which exhibited a peak in loss at 1.58 GHz. Composites fabricated with ~0.1 μm Cabot BT-8 hydrothermal powder, showed a broad relaxation over the measured frequency range. The reduction in particle size and subsequent modulation of the domain structure has been attributed to the shift in the relaxation frequency
Keywords :
barium compounds; dielectric losses; dielectric relaxation; electric domains; ferroelectric materials; filled polymers; particle size; permittivity; piezoceramics; powder technology; 0.1 mum; 1 mum; 1.58 GHz; 10 kHz to 5.6 GHz; 776 MHz; BaTiO3; BaTiO3 ceramics; BaTiO3 powder-polypropylene composites; Cabot BT-8 hydrothermal powder; TAM HPB BaTiO3 powder; dielectric constant; dielectric dispersion; dielectric relaxation; domain structure modulation; loss peak; microwave frequencies; particle size dependent high frequency dielectric properties; relaxation frequency shift; Barium; Ceramics; Dielectric losses; Dielectric materials; Dielectric measurements; Frequency; Polymers; Powders; Resonance; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on
Conference_Location :
East Brunswick, NJ
Print_ISBN :
0-7803-3355-1
DOI :
10.1109/ISAF.1996.598154
