TY - GEN
T1 - Preparation and microwave dielectric properties of Ca(Sm 0.5Nb0.5)O3 ceramics
AU - Li, Jiamao
AU - Qiu, Tai
PY - 2012
Y1 - 2012
N2 - Microstructures and microwave dielectric properties of Ca(Sm 0.5Nb0.5)O3 ceramics, prepared by a conventional solid-state reaction method, were systematically investigated by varying calcining temperature, sintering temperature and cooling rate. The XRD result showed that a single Ca(Sm0.5Nb0.5)O3 phase could be synthesized at a calcining temperature of 1200 °C. Optimized combination of microwave dielectric properties of εr = 22.36, Q×f = 18030 GHz and τf = -31.2 ppm/°C was obtained for the furnace-cooled Ca(Sm0.5Nb0.5)O3 ceramics sintered at 1550 °C for 4 h. However, some microcracks were found from the microstructures of the furnace-cooled specimens. Further, the Q×f value could be increased by controlling the cooling rate during the sintering process due to the disappearance of microcracks in the final material. With a cooling rate of 2 °C/min, Ca(Sm0.5Nb0.5)O3 ceramics exhibited an enhanced Q×f value of 37130 GHz.
AB - Microstructures and microwave dielectric properties of Ca(Sm 0.5Nb0.5)O3 ceramics, prepared by a conventional solid-state reaction method, were systematically investigated by varying calcining temperature, sintering temperature and cooling rate. The XRD result showed that a single Ca(Sm0.5Nb0.5)O3 phase could be synthesized at a calcining temperature of 1200 °C. Optimized combination of microwave dielectric properties of εr = 22.36, Q×f = 18030 GHz and τf = -31.2 ppm/°C was obtained for the furnace-cooled Ca(Sm0.5Nb0.5)O3 ceramics sintered at 1550 °C for 4 h. However, some microcracks were found from the microstructures of the furnace-cooled specimens. Further, the Q×f value could be increased by controlling the cooling rate during the sintering process due to the disappearance of microcracks in the final material. With a cooling rate of 2 °C/min, Ca(Sm0.5Nb0.5)O3 ceramics exhibited an enhanced Q×f value of 37130 GHz.
KW - Microstructure
KW - Microwave dielectric properties
KW - Preparation
UR - http://www.scopus.com/inward/record.url?scp=84862733289&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.512-515.1198
DO - 10.4028/www.scientific.net/KEM.512-515.1198
M3 - 会议稿件
AN - SCOPUS:84862733289
SN - 9783037854259
T3 - Key Engineering Materials
SP - 1198
EP - 1202
BT - High-Performance Ceramics VII
PB - Trans Tech Publications Ltd
T2 - 7th China International Conference on High-Performance Ceramics, CICC-7
Y2 - 4 November 2011 through 7 November 2011
ER -