Improved microwave dielectric properties for CaTi0.55(Al0.5Nb0.5)0.45O3 ceramics with low firing temperature by B2O3 addition
Improved microwave dielectric properties for CaTi0.55(Al0.5Nb0.5)0.45O3 ceramics with low firing temperature by B2O3 addition
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DOI：
10.1007/s10854-017-7940-0
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
G. H. Chen;C. Xia;J. -. Chen
中科院分区：
文献类型：
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作者：
G. H. Chen;C. Xia;J. -. Chen
采用传统固相法制备了CaTi 0.55（Al 0.5Nb 0.5）0.45 O3陶瓷，其中B2 O3的添加量为xwt %（0 ≤x≤ 5）。研究了添加B2 O3的CaTi0.55（Al0.5Nb0.5）0.45O3陶瓷的烧结行为、显微结构和微波介电性能。结果表明，B2 O3的加入使CaTi0.55（Al0.5Nb0.5）0.45O3陶瓷的烧成温度从1540 ° C降低到1350 °C，并提高了介电性能。XRD结果表明，所研究的复合材料均为单一固溶体相，具有正交结构。SEM结果也证实没有第二相的证据。介电常数（εr）随B2 O3含量的变化不明显，谐振频率温度系数（τ ε）随B2 O3含量的变化正向增大。当x = 3时，品质因数（Q × Q）明显增大，随着x的进一步增大，品质因数（Q × Q）略有下降。当B2 O3含量为3wt%时，在1350 °C空气中烧结4 h，CaTi0.55（Al0.5Nb0.5）0.45O3陶瓷的介电常数εr= 53.9，Q × ε r = 30308.5GHz，τ r = 13.2ppm/°C，可用于微波通信领域。
CaTi0.55(Al0.5Nb0.5)0.45O3ceramics withxwt% of B2O3additive (0 ≤x≤ 5) were prepared by the conventional solid-state method. And the sintering behavior, microstructure, and microwave dielectric properties of the B2O3-added CaTi0.55(Al0.5Nb0.5)0.45O3ceramics were investigated. The results show that the additions of B2O3significantly lower firing temperature of CaTi0.55(Al0.5Nb0.5)0.45O3ceramics from 1540 to 1350 °C and enhance dielectric properties. The XRD results suggest that all studied compositions adopt single solid solution phase with orthorhombic structure. The SEM results also confirm no evidence of secondary phase. The permittivity (εr) varies inconspicuously with the B2O3content, and the temperature coefficient of resonant frequency (τƒ) changes toward more positive. While, the quality factor (Q × ƒ) increases obviously up tox= 3 and degrades slightly with further increasingx. Typically, an excellent dielectric properties of εr= 53.9, Q × ƒ = 30308.5 GHz, τƒ= 13.2 ppm/°C are achieved for CaTi0.55(Al0.5Nb0.5)0.45O3ceramics with 3 wt% B2O3sintered at 1350 °C for 4 h in air, suitable for application in microwave communication fields.