Microwave dielectric properties of Ca[(Li_1/3Nb_2/3)_1−xM_x]O_3−δ (M = Sn, Ti) ceramics
Microwave dielectric properties of Ca[(Li_1/3Nb_2/3)_1−xM_x]O_3−δ (M = Sn, Ti) ceramics
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DOI：
10.1557/jmr.1999.0483
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发表时间：
1999-09
影响因子：
2.7
通讯作者：
Ji-won Choi;C. Kang;Seok-Jin Yoon;Hyun-Jai Kim;Hyung-Jin Jung;K. Yoon
中科院分区：
文献类型：
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作者：
Ji-won Choi;C. Kang;Seok-Jin Yoon;Hyun-Jai Kim;Hyung-Jin Jung;K. Yoon
研究了Ca[(Li_1/3Nb_2/3)_1− x M_ x ]O_3−δ (M = Sn, Ti, 0 ≤ x ≤ 0.5)陶瓷的微波介电性能。一般来说，制备的陶瓷是多相材料。然而，在Sn=0.2至0.3、Ti=0.2附近可以获得具有类似于CaTiO_3的斜方钙钛矿结构的单相样品。随着Sn浓度的增加，介电常数（ε_r）下降，品质因数（Q）在有限的Sn浓度内显着增加。随着Ti浓度的增加，介电常数(ε_r)增加，品质因数(Q)下降，谐振频率温度系数(τ_f)由负值变为正值。当 Ti = 0.2 时，实现了 0 ppm/°C 的谐振频率温度系数。发现该组合物的Q·f_o值和εr分别为26100GHz和38.6。
The microwave dielectric properties of Ca[(Li_1/3Nb_2/3)_1− x M_ x ]O_3−δ (M = Sn, Ti, 0 ≤ x ≤ 0.5) ceramics were investigated. In general, the ceramics prepared were multiphase materials. However, single-phase specimens having orthorhombic perovskite structure similar to CaTiO_3 could be obtained in the vicinity of Sn = 0.2 to 0.3, and Ti = 0.2. As Sn concentration increased, the dielectric constant (ε_ r ) decreased and the quality factor ( Q ) significantly increased within the limited Sn concentration. As Ti concentration increased, the dielectric constant (ε_ r ) increased, the quality factor ( Q ) decreased, and the temperature coefficient of resonant frequency (τ_ f ) changed from a negative to positive value. The temperature coefficient of resonant frequency of 0 ppm/°C was realized at Ti = 0.2. The Q · f _o value and ε r for this composition were found to be 26100 GHz and 38.6, respectively.