TY - JOUR
T1 - Effect of bond valence on microwave dielectric properties of (1-x)CaTiO 3-x(Li 0.5La 0.5)TiO 3 ceramics
AU - Li, Jiamao
AU - Han, Yuxian
AU - Qiu, Tai
AU - Jin, Chuangui
PY - 2012/9
Y1 - 2012/9
N2 - The origins of microwave dielectric properties (1 - x)CaTiO 3-x(Li 0.5La 0.5)TiO 3 (0.2 ≤ x ≤ 0.8) ceramics, prepared by a conventional solid-state reaction method, were investigated based on the theory of bond valence. The XRD and SEM results showed that complete solid solutions with orthorhombic perovskite structure were formed in the whole investigated compositional range. The dielectric constant (ε r), quality factor (Q × f) and temperature coefficient of resonant frequency (τ f) were closely related to B-site, A-site and the difference between A-site and B-site bond valences of ABO 3 perovskite compounds, respectively. As x value increased from 0.2 to 0.8, the dielectric constant increased from 198.3 to 276.8, the Q × f value decreased from 4340 to 1880 GHz, and the τ f value varied from +489.7 to -178 ppm/°C. For practical applications, excellent microwave dielectric properties of ε r = 245, Q × f = 2750 GHz and τ f = +0.75 ppm/°C were obtained for 0.4CaTiO 3-0.6(Li 0.5La 0.5)TiO 3 ceramics.
AB - The origins of microwave dielectric properties (1 - x)CaTiO 3-x(Li 0.5La 0.5)TiO 3 (0.2 ≤ x ≤ 0.8) ceramics, prepared by a conventional solid-state reaction method, were investigated based on the theory of bond valence. The XRD and SEM results showed that complete solid solutions with orthorhombic perovskite structure were formed in the whole investigated compositional range. The dielectric constant (ε r), quality factor (Q × f) and temperature coefficient of resonant frequency (τ f) were closely related to B-site, A-site and the difference between A-site and B-site bond valences of ABO 3 perovskite compounds, respectively. As x value increased from 0.2 to 0.8, the dielectric constant increased from 198.3 to 276.8, the Q × f value decreased from 4340 to 1880 GHz, and the τ f value varied from +489.7 to -178 ppm/°C. For practical applications, excellent microwave dielectric properties of ε r = 245, Q × f = 2750 GHz and τ f = +0.75 ppm/°C were obtained for 0.4CaTiO 3-0.6(Li 0.5La 0.5)TiO 3 ceramics.
KW - A. Ceramics
KW - C. X-ray diffraction
KW - D. Dielectric properties
UR - http://www.scopus.com/inward/record.url?scp=84864631155&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2012.05.024
DO - 10.1016/j.materresbull.2012.05.024
M3 - 文章
AN - SCOPUS:84864631155
SN - 0025-5408
VL - 47
SP - 2375
EP - 2379
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 9
ER -