Title :
Improvement of structural and electrical properties of the (Ba,Sr,Ca)TiO3 ceramics by O2-sintering method
Author :
Han, Mvune-Soo ; Lim, Sung-Soo ; Hahn, Suk-Ryong ; Lee, Jaehyung
Author_Institution :
R & D Center, KEC Corp., Gyeongsangbuk, South Korea
fDate :
26 Jun-3 Jul 2001
Abstract :
(Ba0.6Sr0.3Ca0.1) TiO3 (BSCT) powders were prepared by the sol-gel method using a solution of Ba, Sr and Ca acetate and Ti isopropoxide. BSCT ceramics, doped with MnCO3 (0.1 mol%) and Y2O3 (0.5 mol%), were fabricated by the cold isostatic press method, and then the structural and electrical properties as a function of milling method and sintering atmosphere were studied. All specimens showed small and uniform grains of 1-3 μm in diameter. Average pore size of BSCT ceramics were sintered at air ambient, was 5 microns, BSCT ceramics were sintered at 1450°C, oxygen atmosphere was 3 microns. Dielectric constant and dielectric loss of air-sintered BSCT specimens at the Curie temperature were 16000 and 1.4% under a zero bias field, respectively. O 2-sintered BSCT ceramics were 36000 and 1.3%, respectively. The pyroelectric coefficient of BSCT ceramics was increased with an O 2-sintering showed a value of 650×10-9 C/cm 2 K under a 4 kV/cm DC bias field
Keywords :
X-ray diffraction; barium compounds; calcium compounds; dielectric losses; differential thermal analysis; ferroelectric Curie temperature; ferroelectric ceramics; grain size; permittivity; powder technology; pyroelectricity; scanning electron microscopy; sintering; sol-gel processing; strontium compounds; (BaSrCa)TiO3; 1450 C; Curie temperature; X-ray diffraction; chemical homogeneity; cold isostatic press method; crystallinity; dielectric constant; dielectric loss; dielectric properties; differential thermal analysis; electrical properties; ferroelectric ceramic; grain size; microstructure; milling; perovskite structure; pyroelectric properties; scanning electron microscopy; sintering atmosphere; sol-gel method; structural properties; thermogravimetry curves; uncooled infrared detector materials; zero bias field; Ceramics; Dielectric constant; Dielectric materials; Grain size; Infrared detectors; Plasma materials processing; Plasma temperature; Powders; Pyroelectricity; Strontium;
Conference_Titel :
Science and Technology, 2001. KORUS '01. Proceedings. The Fifth Russian-Korean International Symposium on
Conference_Location :
Tomsk
Print_ISBN :
0-7803-7008-2
DOI :
10.1109/KORUS.2001.975244
