Effect of Li super(+) ion mobility on the grain boundary conductivity of Li sub(2)TiO sub(3) nanoceramics

Lithium titanate (Li sub(2)TiO sub(3)) is one of the most promising candidates among the tritium breeding materials because of its good tritium release capacity. Li concentration has much significance on the diffusivity of tritium in the material. The nanocrystalline single-phase Li sub(2)TiO sub(3)...

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Bibliographic Details
Published in:Journal of advanced ceramics 2014-06, Vol.3 (2), p.98-108
Main Authors: Dash, Umasankar, Sahoo, Subhanarayan, Parashar, SKS, Chaudhuri, Paritosh
Format: Article
Language:English
Subjects:
Activation energy
Field emission
Grain boundaries
Ionic mobility
Lithium
Nanocrystals
Nanostructure
Tritium
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Summary:Lithium titanate (Li sub(2)TiO sub(3)) is one of the most promising candidates among the tritium breeding materials because of its good tritium release capacity. Li concentration has much significance on the diffusivity of tritium in the material. The nanocrystalline single-phase Li sub(2)TiO sub(3) with monoclinic structure has been prepared by high energy ball milling followed by calcination at 700 degree C for 2 h. The field emission scanning electron microscopy (FESEM) studies confirmed uniform distribution of nanocrystalline phase with particle size below 100 nm. The study of the Li super(+) ion diffusion on the sintered sample was investigated by means of electrical conductivity measurements. Electrical properties of the samples were studied in wide temperature (50-500 degree C) and frequency (100 Hz-1 MHz) ranges. The complex impedance spectroscopy (CIS) studies showed the presence of both bulk and grain boundary effects in nanocrystalline Li sub(2)TiO sub(3). The bulk resistance of the samples has been observed to decrease with rise in temperature showing a typical negative temperature coefficient of resistance (NTCR) behavior. The low activation energies of the samples suggested the presence of singly ionized oxygen vacancies in the conduction process. The hopping frequency shifted toward higher frequency with increase in temperature. Activation energy of 0.86 eV was calculated from AC conductivity.
ISSN:2226-4108
2227-8508
DOI:10.1007/s40145-014-0098-9