Title :
The effect of dysprosium on the microstructure and dielectric properties of (Ba1-xSrx)TiO3 ceramics
Author :
Wang, Hong-Wen ; Hall, David A.
Author_Institution :
Manchester Univ., UK
fDate :
30 Aug-2 Sep 1992
Abstract :
A study was performed on the microstructure and dielectric properties of barium strontium titanate ceramics having the compositions (Ba1-xSrx)TiO3, and (Ba0.99-xSrxDy0.01)TiO3 with x in the range from 0 to 0.3. In all cases, the addition of dysprosium resulted in a marked reduction in grain size, from ≈50 μm to ≈1 μm, which was accompanied by a substantial increase in permittivity below the Curie temperature. The peak in permittivity at the Curie point was strongly suppressed by Dy-doping, and the phase transition range became broad and diffuse, particularly at the higher levels of strontium. TEM (transmission electron microscope) observations of a high density of dislocations and an inhomogeneous distribution of strontium within the grains suggest that the chemical segregation of strontium is largely responsible for this diffuse phase transition behavior
Keywords :
barium compounds; ceramics; dislocation density; dysprosium compounds; ferroelectric Curie temperature; ferroelectric materials; grain size; permittivity; segregation; strontium compounds; transmission electron microscope examination of materials; (Ba0.99-xSrxDy0.01)TiO3 ; (Ba1-xSrx)TiO3 ceramics; Curie point; Curie temperature; Dy-doping; chemical segregation; compositions; density; dielectric properties; diffuse phase transition behavior; dislocations; grain size; inhomogeneous distribution; microstructure; permittivity; phase transition range; transmission electron microscope; Barium; Ceramics; Dielectrics; Electrons; Grain size; Microstructure; Permittivity; Strontium; Temperature; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 1992. ISAF '92., Proceedings of the Eighth IEEE International Symposium on
Conference_Location :
Greenville, SC
Print_ISBN :
0-7803-0465-9
DOI :
10.1109/ISAF.1992.300620
