Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/86373
Title: Glass formation, structure and ion transport in 0̇45Li 2O-(0̇55?x)P 2O 5-xB 2O 3 glasses
Authors: Tho, T.D.
Rao, R.P. 
Adams, S. 
Issue Date: Jun-2011
Source: Tho, T.D.,Rao, R.P.,Adams, S. (2011-06). Glass formation, structure and ion transport in 0̇45Li 2O-(0̇55?x)P 2O 5-xB 2O 3 glasses. Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B 52 (3) : 91-100. ScholarBank@NUS Repository.
Abstract: The formation, atomic structure and transport properties of 0̇45Li 2O-(0̇55?x)P 2O 5-xB 2O 3 glasses are studied by keeping the molar ratio of Li 2O/(P 2O 5+B 2O 3) constant to focus on the cation mobility changes due to the mixed glass former effect. X-ray diffraction confirms glass formation of this system within the range of 0≤x≤0̇40. As the B 2O 3 content increases, the glass transition temperature (Tg) increases, molar volume decreases, and the glasses become more fragile. FT-IR, Raman and XPS spectroscopic studies indicate the formation of P-O-B bonds. Deconvolution of Raman and XPS spectra indicates a decrease of P-O-P, O-P-O stretching vibrations of phosphate chains, and an increase of P-O-B bonds with rising B 2O 3 content. The maximum fraction of P-O-B bonds was observed for x=0̇30. Nonbridging oxygens were found to reduce with increasing B 2O 3 content. The electrical conductivity of these glasses has been investigated over a temperature range from 300 to 479 K and the frequency range 150 Hz≤ω≤15 MHz by means of impedance spectroscopy. The highest ionic conductivity of 1̇02×10 ?7 S cm ?1 at room temperature with the lowest activation energy of 0̇63 eV was observed for x=0̇30. Analyses of impedance data, in the conductivity and modulus formalisms, as a function of temperature and frequency led to common super-master curves at all temperatures and all compositions indicating that the relaxation mechanism is a temperature independent universal process that essentially consists of a redistribution of the mobile Li + ions.
Source Title: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B
URI: http://scholarbank.nus.edu.sg/handle/10635/86373
ISSN: 00319090
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

26
checked on Feb 16, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.