Title :
Pore-dependent dielectric and electrical properties of barium titanate ceramic
Author :
Cho, Kyeong Ho ; Lee, Hee Young
Author_Institution :
Dept. of Electron. Eng., Yeungnam Univ., Kyongsan, South Korea
Abstract :
Dielectric and electrical properties of pore-containing barium titanate ceramic were studied. Porosity was controlled in the 5-37% range, and two different sizes of spherical pores were successfully incorporated into the ceramic using 25 μm and 80 μm polymer microspheres. The transition from closed porosity to open porosity was found to be pore size dependent and occurred at lower porosity value as pore size decreased. In addition, the gradual decrease of both dielectric constant and Curie temperature was noticed as porosity increased. The amount of pores greatly affected the resistance of barium titanate ceramic. A qualitative model, which is based an lumped parameters, is proposed in an attempt to rationalize experimental results
Keywords :
barium compounds; ceramics; electrical resistivity; ferroelectric Curie temperature; ferroelectric materials; permittivity; porosity; porous materials; 25 mum; 80 mum; BaTiO3; Curie temperature; barium titanate ceramic; closed porosity; dielectric constant; electrical properties; lumped parameters; open porosity; polymer microspheres; pore-containing barium titanate ceramic; pore-dependent dielectric properties; porosity; qualitative model; resistance; spherical pores; Barium; Ceramics; Dielectric constant; Impedance measurement; Microstructure; Polymers; Powders; Shape; Temperature; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
DOI :
10.1109/ISAF.1994.522432
