Dielectric Properties of Ca-Based Complex Perovskite at Microwave Frequencies.
Dielectric Properties of Ca-Based Complex Perovskite at Microwave Frequencies.
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DOI：
10.1143/jjap.33.5463
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发表时间：
1994-09
影响因子：
1.5
通讯作者：
H. Kagata;J. Kato
中科院分区：
文献类型：
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作者：
H. Kagata;J. Kato
我们研究了Ca(B3+1/2B1/2'5+)O3 (B: Al, Cr, Mn, Fe; B': Nb, Ta)和Ca(B2+1/3B2/3'5+)O3 (B: Mg, Ca, Co, Ni, Cu, Zn; B': Nb, Ta)钙钛矿陶瓷的微波介电性能和晶体结构。与众所周知的Ba基钙钛矿电介质相比，Ca基复合钙钛矿电介质具有较低的相对介电常数（er）、较低的Q值和较大的谐振频率负温度系数（τf）。 Ca(Mg1/3Ta2/3)O3 在本次研究中具有最高的 Q 值（Qf=78000 GHz）。所有 Ca(B1/2B1/2')O3 都具有与 CaTiO3 类似的钙钛矿结构，其晶胞包括四个简单的钙钛矿电池。 Ca(B1/3B2/3')O3 与 Ni 等小 B 离子具有相同的结构 Ca(B1/2B1/2')O3。然而，当 B 离子具有较大的离子半径时，Ca(B1/3B2/3')O3 具有钙钛矿结构，其晶胞比 CaTiO3 更大。
We have investigated microwave dielectric properties and crystal structures of Ca(B3+1/2B1/2'5+)O3 (B: Al, Cr, Mn, Fe; B': Nb, Ta) and Ca(B2+1/3B2/3'5+)O3 (B: Mg, Ca, Co, Ni, Cu, Zn; B': Nb, Ta) perovskite ceramics. Compared with well-known Ba-based perovskite dielectrics, the Ca-based complex perovskite dielectrics had lower relative permittivities (er), lower Q values, and larger negative temperature coefficients of resonant frequencies (τf). Ca(Mg1/3Ta2/3)O3 had the highest Q value (Qf=78000 GHz) in this investigation. All Ca(B1/2B1/2')O3 had perovskite structures similar to CaTiO3 with a unit cell including four simple perovskite cells. Ca(B1/3B2/3')O3 with a small B ion such as Ni had the same structure Ca(B1/2B1/2')O3. Ca(B1/3B2/3')O3, however, had perovskite structures with larger unit cells than CaTiO3 when B ions had larger ionic radii.