Colossal permittivity in titanium dioxide ceramics modified by tantalum and trivalent elements
Colossal permittivity in titanium dioxide ceramics modified by tantalum and trivalent elements
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DOI：
10.1016/j.actamat.2015.09.046
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发表时间：
2016-01-15
期刊：
影响因子：
9.4
通讯作者：
Wu, Wenjuan
中科院分区：
文献类型：
--
作者：
Li, Zhenwei;Wu, Jiagang;Wu, Wenjuan
巨介电常数（CP）材料在高性能电容器和电子器件规模化方面的应用继续吸引着人们的极大兴趣。然而，它们的介电常数、介电损耗和稳定性的不平衡发展仍然阻碍着实际应用。在这项研究中，我们在一系列新的二氧化钛（即，含有Ta和三价元素的（A（0.5）Ta（0.5））（x）Ti 1-xO 2，其中A = Al、Sm、Bi、Fe、In、Dy、Ga、Gd、Yb或Sc）陶瓷，其与之前报道的In和Nb共掺杂陶瓷的结果相当或优于之前报道的结果。上级。此外，通过调整所使用的三价元素的类型，在陶瓷中实现了低介电损耗（tan δ类似于5.4%，1 kHz）;这种陶瓷还显示出关于频率（10（2）类似于10（6）Hz）和温度（~ 150 - 200 ℃）稳定性的相对良好的介电性质。缺陷偶极簇的形成（例如，由Ta和三价元素诱导的Al ~（3+）PVo-Ti ~（3+）和Ta（5+）Ti（3+）A（Ti）（A = Ti ~（3+）/Al ~（3+）/Ti ~（4+））应该是所观察到的介电性能增强的原因。我们认为，二氧化钛基陶瓷是一个最有前途的候选人在该领域的电子和能量存储设备。(c)2015 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Colossal permittivity (CP) materials continue to attract significant interest for their applications in highperformance capacitors and scaling advances in electronic devices. However, the unbalanced developments of their dielectric constants, dielectric losses, and stabilities still hinder practical applications. In this study, we attained a colossal permittivity (epsilon(r) = 10(4)similar to 10(5), 1 kHz) in a series of new titanium dioxide (i.e., (A(0.5)Ta(0.5))(x)Ti1-xO2, where A = Al, Sm, Bi, Fe, In, Dy, Ga, Gd, Yb, or Sc) ceramics containing Ta and trivalent elements that is comparable or superior to the previously reported results in In and Nb co-doped ceramics. In addition, a low dielectric loss (tan delta similar to 5.4%, 1 kHz) was achieved in the ceramics by tailoring the types of trivalent elements used; such a ceramic also shows relatively good dielectric properties with regard to frequency (10(2)similar to 10(6) Hz) and temperature (-150-200 degrees C) stabilities. The formation of defectdipole clusters (e.g., Al3+PVo-Ti3+ and Ta(5+)Ti(3+)A(Ti) (A = Ti3+/Al3+/Ti4+)) induced by Ta and trivalent elements should be responsible for the observed enhancements in dielectric properties. We believe that TiO2-based ceramics are one of the most promising candidates in the field of electronic and energy-storage devices. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.