TY - JOUR
T1 - Dielectric properties of (1-y)Ca1-xLa2x/3TiO3-y(Li,Nd)1/2 TiO3 ceramic system at microwave frequency
AU - Huang, Cheng Liang
AU - Tsai, Jsung Ta
AU - Chen, Yuan Bin
N1 - Funding Information:
This work was supported by the National Science Council of the Republic of China under grant NSC86–2221-E-006–024.
PY - 2001/2
Y1 - 2001/2
N2 - The solid solution of dielectric ceramic Ca1-xLa2x/3TiO3 system for the composition range of 0.1 ≤ x ≤ 0.9 is studied. The crystal structure of the system is single perovskite. From the X-ray diffraction patterns, the superstructure reflection lines are detected for the composition x ≥ 0.5. With an increase in the substitution amount of La, the permittivity and the temperature coefficient of resonant frequency (TCF) decrease. A maximum Q × f value of 17600 appears at x = 0.4 since that the extrinsic origin for the dielectric loss degrades the Q × f value due to the poor grain growth for the composition x ≥ 0.5. (1-y)Ca1-xLa2x/3TiO3-y(Li,Nd)1/2 TiO3 compounds are introduced to obtain a good temperature stability of resonant frequency. With x = 0.4, the composition y = 0.5 shows good temperature stability (τf = +4.5ppm/°C) with a high permittivity of 105 and a Q × f value of 7000 GHz.
AB - The solid solution of dielectric ceramic Ca1-xLa2x/3TiO3 system for the composition range of 0.1 ≤ x ≤ 0.9 is studied. The crystal structure of the system is single perovskite. From the X-ray diffraction patterns, the superstructure reflection lines are detected for the composition x ≥ 0.5. With an increase in the substitution amount of La, the permittivity and the temperature coefficient of resonant frequency (TCF) decrease. A maximum Q × f value of 17600 appears at x = 0.4 since that the extrinsic origin for the dielectric loss degrades the Q × f value due to the poor grain growth for the composition x ≥ 0.5. (1-y)Ca1-xLa2x/3TiO3-y(Li,Nd)1/2 TiO3 compounds are introduced to obtain a good temperature stability of resonant frequency. With x = 0.4, the composition y = 0.5 shows good temperature stability (τf = +4.5ppm/°C) with a high permittivity of 105 and a Q × f value of 7000 GHz.
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U2 - 10.1016/S0025-5408(01)00528-1
DO - 10.1016/S0025-5408(01)00528-1
M3 - Article
AN - SCOPUS:0035245409
SN - 0025-5408
VL - 36
SP - 547
EP - 556
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 3-4
ER -