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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Subramanian, Balasubramanian
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Publications (6/6 displayed)
- 2018Fabrication of sputtered titanium vanadium nitride (TiVN) thin films for micro-supercapacitorscitations
- 2017Antimicrobial Characteristics of Pulsed Laser Deposited Metal Oxides on Polypropylene Hydroentangled Nonwovens for Medical Textilescitations
- 2017AC, DC conduction and dielectric behaviour of solid and liquid phase sintered Al2O3-15 mol% V2O5 pelletscitations
- 2017Biomineralisation with Saos-2 bone cells on TiSiN sputtered Ti alloyscitations
- 2016Apatite layer growth on glassy Zr48Cu36Al8Ag8 sputtered titanium for potential biomedical applicationscitations
- 2016Nanostructured TiCrN thin films by Pulsed Magnetron Sputtering for cutting tool applicationscitations
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article
AC, DC conduction and dielectric behaviour of solid and liquid phase sintered Al2O3-15 mol% V2O5 pellets
Abstract
Microstructural and dielectric characterization of porous Al2O3-V2O5 pellets sintered under both solid (600 °C) and liquid phase (850 °C) conditions are reported. The low temperature solid state sintering (SSS) leaves a very porous network of dense alumina particles surrounded by smaller facetted vanadia, whereas under liquid phase sintering (LPS), the V2O5 melts and recrystallizes over the relatively inert Al2O3, leading to a connected network structure. The ac conductivity and dielectric parameters of the pellets investigated from room temperature (RT) to 400 °C exhibited both universal dielectric (diffusive) behaviour at low frequencies and nearly constant loss (sub-diffusive) regimes at low temperatures. Activation energies calculated for dc/ac conduction at different frequencies suggests a composite conduction mechanism controlled by the Vanadia phase: at low frequencies, the calculated energies (Ea≈0.5 eV) compare with ionic diffusion of vanadium in V2O5, while at high frequencies and low temperatures an additional (Ea≤0.16 eV) polaronic hopping mechanism is seen. This cross-over frequency is significant for the LPS specimen indicating that the vanadia connected network assists conduction by providing a continuous (but disordered) diffusion route. Impedance and modulus spectral analysis show the presence of distributed time constants arising from electrodes, pore/matrix and phase interfaces and GBs.