Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)(x)Ti1-xO2
Dong, Wen; Chen, Dehong; Hu, Wanbiao; Frankcombe, Terry J.; Chen, Hua2; Zhou, Chao3; Fu, Zhenxiao3; Wei, Xiaoyong4,5; Xu, Zhuo4,5; Liu, Zhifu6; Li, Yongxiang6; Liu, Yun
AbstractThis work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg2+, Ta5+) co-doped rutile TiO2 polycrystalline ceramics with nominal compositions of (Mg2+ Ta-1/3(5+) (2/3))(x)Ti1-xO2. 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 electronpinned Mg ''(Ti) + V-O(center dot center dot) + 2Ta(Ti)(center dot) + 2Ti '(Ti) 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.
WOS IDWOS:000408622400044
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Document Type期刊论文
Affiliation1.Australian Natl Univ, Res Sch Chem, Canberra, ACT 2601, Australia
2.Frankcombe, Terry J.] Univ New South Wales, Sch Phys Environm & Math Sci, Canberra, ACT 2601, Australia
3.Australian Natl Univ, Ctr Adv Microscopy, Canberra, ACT 2601, Australia
4.Fenghua Adv Technol Holding Co Ltd, Zhaoqing 526020, Guangdong, Peoples R China
5.Xi An Jiao Tong Univ, Minist Educ, Elect Mat Res Lab, Key Lab, Xian 710049, Shaanxi, Peoples R China
6.Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Shaanxi, Peoples R China
7.Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Inorgan Funct Mat & Devices, Shanghai 200050, Peoples R China
Recommended Citation
GB/T 7714
Dong, Wen,Chen, Dehong,Hu, Wanbiao,et al. Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)(x)Ti1-xO2[J]. SCIENTIFIC REPORTS,2017,7.
APA Dong, Wen.,Chen, Dehong.,Hu, Wanbiao.,Frankcombe, Terry J..,Chen, Hua.,...&Liu, Yun.(2017).Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)(x)Ti1-xO2.SCIENTIFIC REPORTS,7.
MLA Dong, Wen,et al."Colossal permittivity behavior and its origin in rutile (Mg1/3Ta2/3)(x)Ti1-xO2".SCIENTIFIC REPORTS 7(2017).
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