Colossal Dielectric Permittivity in (Nb+Al) Codoped Rutile TiO 2 Ceramics: Compositional Gradient and Local Structure
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Hu, Wanbiao; Lau, Taim Soon (Kenny); Liu, Yun; Withers, Raymond; Chen, Hua; Fu, Lan; Gong, Bill; Hutchison, Wayne
Description
(Nb+Al) codoped rutile TiO<inf>2</inf> ceramics with nominal composition Ti4+<inf>0.995</inf>Nb5+<inf>0.005y</inf>Al3+<inf>0.005z</inf>O<inf>2</inf>, z = (4-5y)/3 and y = 0.4, 0.5, 0.6, 0.7, and Ti4+<inf>0.90</inf>Nb5+<inf>0.05</inf>Al3+<inf>0.05</inf>O<inf>2</inf> have been synthesized. The resultant samples in ceramic pellet form exhibit a colossal dielectric permittivity (>-104) with an acceptably low dielectric loss (-10-1) after optimization of the processing conditions. It is found that a...[Show more]
dc.contributor.author | Hu, Wanbiao | |
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dc.contributor.author | Lau, Taim Soon (Kenny) | |
dc.contributor.author | Liu, Yun | |
dc.contributor.author | Withers, Raymond | |
dc.contributor.author | Chen, Hua | |
dc.contributor.author | Fu, Lan | |
dc.contributor.author | Gong, Bill | |
dc.contributor.author | Hutchison, Wayne | |
dc.date.accessioned | 2016-06-14T23:21:40Z | |
dc.identifier.issn | 0897-4756 | |
dc.identifier.uri | http://hdl.handle.net/1885/104024 | |
dc.description.abstract | (Nb+Al) codoped rutile TiO<inf>2</inf> ceramics with nominal composition Ti4+<inf>0.995</inf>Nb5+<inf>0.005y</inf>Al3+<inf>0.005z</inf>O<inf>2</inf>, z = (4-5y)/3 and y = 0.4, 0.5, 0.6, 0.7, and Ti4+<inf>0.90</inf>Nb5+<inf>0.05</inf>Al3+<inf>0.05</inf>O<inf>2</inf> have been synthesized. The resultant samples in ceramic pellet form exhibit a colossal dielectric permittivity (>-104) with an acceptably low dielectric loss (-10-1) after optimization of the processing conditions. It is found that a conventional surface barrier layer capacitor (SBLC) effect, while it contributes significantly to the observed colossal permittivity, is not the dominant effect. Rather, there exists a subtle chemical compositional gradient inward from the pellet surface, involving the concentration of Ti3+ cations gradually increasing from zero at the surface without the introduction of any charge compensating oxygen vacancies. Instead, well-defined G<inf>r</inf> ± 1/<inf>3</inf>[011]∗ satellite reflections with the modulation wave-vector q = 1/<inf>3</inf>[011]<inf>r</inf>∗ and sharp diffuse streaking running along the G<inf>r</inf> ± ε011]∗ direction from electron diffraction suggest that the induced additional metal ions appear to be digested by a locally intergrown, intermediate, metal ion rich structure. This gradient in local chemical composition exists on a scale up to submillimeters, significantly affecting the overall dielectric properties. This work suggests that such a controllable surface compositional gradient is an alternative method to tailor the desired dielectric performance. | |
dc.publisher | American Chemical Society | |
dc.source | Chemistry of Materials | |
dc.title | Colossal Dielectric Permittivity in (Nb+Al) Codoped Rutile TiO 2 Ceramics: Compositional Gradient and Local Structure | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 27 | |
dc.date.issued | 2015 | |
local.identifier.absfor | 030206 - Solid State Chemistry | |
local.identifier.ariespublication | u8801298xPUB101 | |
local.type.status | Published Version | |
local.contributor.affiliation | Hu, Wanbiao, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Lau, Taim Soon (Kenny), College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Liu, Yun, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Withers, Raymond, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Chen, Hua, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Fu, Lan, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Gong, Bill, University of New South Wales | |
local.contributor.affiliation | Hutchison, Wayne, University of New South Wales ADFA | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 14 | |
local.bibliographicCitation.startpage | 4934 | |
local.bibliographicCitation.lastpage | 4942 | |
local.identifier.doi | 10.1021/acs.chemmater.5b01351 | |
local.identifier.absseo | 970103 - Expanding Knowledge in the Chemical Sciences | |
dc.date.updated | 2016-06-14T09:18:15Z | |
local.identifier.scopusID | 2-s2.0-84937948841 | |
Collections | ANU Research Publications |
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