文章基本信息

标题：Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)xTi1-xO2
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作者：Wen Dong ; Dehong Chen ; Wanbiao Hu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2017
卷号：7
期号：1
DOI：10.1038/s41598-017-08992-x
语种：English
出版社：Springer Nature
摘要：This work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg(2+), Ta(5+)) co-doped rutile TiO2 polycrystalline ceramics with nominal compositions of (Mg(2+)1/3Ta(5+)2/3) x Ti1-x O2. Colossal permittivity (>7000) with a low dielectric loss (e.g. 0.002 at 1 kHz) across a broad frequency/temperature range can be achieved at x = 0.5% after careful optimization of process conditions. Both experimental and theoretical evidence indicates such a colossal permittivity and low dielectric loss intrinsically originate from the intragrain polarization that links to the electron-pinned [Formula: see text] defect clusters with a specific configuration, different from the defect cluster form previously reported in tri-/pent-valent ion co-doped rutile TiO2. This work extends the research on colossal permittivity and defect formation to bi-/penta-valent ion co-doped rutile TiO2 and elucidates a likely defect cluster model for this system. We therefore believe these results will benefit further development of colossal permittivity materials and advance the understanding of defect chemistry in solids.