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Lithium titanate (Li2TiO3) 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 Li2TiO3 with monoclinic structure has been prepared by high energy ball milling followed by calcination at 700 ℃ 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+ 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 ℃) 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 Li2TiO3. 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.


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Effect of Li+ ion mobility on the grain boundary conductivity of Li2TiO3 nanoceramics

Show Author's information Umasankar DASHa( )Subhanarayan SAHOObS. K. S. PARASHARaParitosh CHAUDHURIc
School of Applied Sciences, KIIT UniversityBhubaneswar-751 024, India
Department of Electrical and Electronics Engineering, Trident Academy of Technology, Bhubaneswar-751 024, India
Institute for Plasma Research, Bhat, Gandhinagar, Gujurat-382 428, India

Abstract

Lithium titanate (Li2TiO3) 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 Li2TiO3 with monoclinic structure has been prepared by high energy ball milling followed by calcination at 700 ℃ 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+ 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 ℃) 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 Li2TiO3. 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.

Keywords:

high energy ball milling, AC conductivity, impedance spectroscopy, nanocrystalline
Received: 08 September 2013 Revised: 06 February 2014 Accepted: 19 February 2014 Published: 01 June 2014 Issue date: June 2014
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Publication history
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Publication history

Received: 08 September 2013
Revised: 06 February 2014
Accepted: 19 February 2014
Published: 01 June 2014
Issue date: June 2014

Copyright

© The author(s) 2014

Acknowledgements

We thank the Board of Research in Fusion Science and Technology (BRFST), Institute for Plasma Research Gandhinagar, India for financial support of the research (Grant No. NFP/MAT/F10/01).

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