Paper Title:
Study of Structure and Li+ Ions Dynamics in Presence of Fe2O3 in Bi2O3∙B2O3 Glasses
  Abstract

Glasses having composition xLi2O∙(30-x)Fe2O3∙20Bi2O3∙50B2O3 (0 ≤ x ≤ 30, in mol%) have been prepared using normal melt-quench technique. The variation in density and molar volume with composition has been investigated in terms of the structural modification that takes place in the glass matrix on decreasing Fe2O3. Infrared spectra of these glasses were recorded over continuous spectral range (400-4000 cm-1) in an attempt to study their structure systematically. IR spectra show that with increase in Li2O/Fe2O3 ratio there is formation of more structural units (e.g. [FeO4/2]-Li+) in the glass network. Bi3+ cations are present as [BiO6] octahedral units and acts as modifier in this glass system. Further, the effect of transition metal ions (iron) on the dynamics of lithium bismuth borate glasses has been studied in the frequency range of 20 Hz - 1 MHz and in the temperature range 240 – 350 °C using impedance spectroscopy. Possible conduction mechanisms are discussed. Various AC and DC electrical and dielectric parameters have been calculated and analyzed. The results show that the contribution of electronic conduction towards conductivity decreases with decreasing iron concentration, which is understood to be due to hopping of electrons from Fe2+→Fe3+. The frequency dependent conductivity has been studied using both conductivity and modulus formalism. The absence of maximum observed in dielectric permittivity in the temperature and frequency range studied, indicate the non-ferroelectric behavior of the glasses.

  Info
Periodical
Solid State Phenomena (Volume 161)
Edited by
Nandyala Sooraj Hussain and José Domingos Santos
Pages
51-61
DOI
10.4028/www.scientific.net/SSP.161.51
Citation
S. Rani, S. Sanghi, A. Agarwal, N. Kishore, "Study of Structure and Li+ Ions Dynamics in Presence of Fe2O3 in Bi2O3∙B2O3 Glasses", Solid State Phenomena, Vol. 161, pp. 51-61, 2010
Online since
June 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Tan Winie, S.R. Majid, M.F. Hassan, A.K. Arof
Abstract:Hexanoyl chitosan that exhibited solubility in THF was prepared by acyl modification of chitosan. Films of hexanoyl chitosan-based polymer...
85
Authors: Kuldeep Mishra, D.K. Rai
Chapter 1: Materials Behavior
Abstract:Dielectric properties of proton conducting polymer electrolyte system, containing polyethylene oxide (PEO) as host polymer and ammonium...
278
Authors: Monica Sindhu, N. Ahlawat, Sujata Sanghi, Ashish Agarwal, A. Ashima, Rekha Kumari, Navneet N. Ahlawat
Chapter 4: Electronic Materials
Abstract:Potassium Sodium Niobate, Na0.5K0.5NbO3 is a promising base material for lead free piezoceramics. The polycrystalline sample Na0.5K0.5NbO3...
210