OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Quasi-intrinsic colossal permittivity in Nb and In co-doped rutile TiO2 nanoceramics synthesized through a oxalate chemical-solution route combined with spark plasma sintering

Han, Hyuksu and Dufour, Pascal and Mhin, Sungwook and Ryu, Jeong Ho and Tenailleau, Christophe and Guillemet, Sophie Quasi-intrinsic colossal permittivity in Nb and In co-doped rutile TiO2 nanoceramics synthesized through a oxalate chemical-solution route combined with spark plasma sintering. (2015) Physical Chemistry Chemical Physics, 17 (26). 16864-16875. ISSN 1463-9076

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
4MB

Official URL: https://doi.org/10.1039/c5cp02653a

Abstract

Nb and In co-doped rutile TiO2 nanoceramics (n-NITO) were successfully synthesized through a chemical-solution route combined with a low temperature spark plasma sintering (SPS) technique. The particle morphology and the microstructure of n-NITO compounds were nanometric in size. Various techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG)/differential thermal analysis (DTA), Fourier transform infrared (FTIR), and Raman spectroscopy were used for the structural and compositional characterization of the synthesized compound. The results indicated that the as-synthesized n-NITO oxalate as well as sintered ceramic have a co-doped single phase of titanyl oxalate and rutile TiO2, respectively. Broadband impedance spectroscopy revealed that novel colossal permittivity (CP) was achieved in n-NITO ceramics exhibiting excellent temperaturefrequency stable CP (up to 104) as well as low dielectric loss (B5%). Most importantly, detailed impedance data analyses of n-NITO compared to microcrystalline NITO (m-NITO) demonstrated that the origin of CP in NITO bulk nanoceramics might be related with the pinned electrons in defect clusters and not to extrinsic interfacial effects.

Item Type:Article
HAL Id:hal-02003098
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Korea Institute of Industrial Technology - KITECH (KOREA)
Other partners > Korea National University of Transportation - KNUT (KOREA)
Laboratory name:
Statistics:download
Deposited By: cirimat webmestre
Deposited On:01 Feb 2019 09:11

Repository Staff Only: item control page