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Title: Effect of substituting iron on structural, thermal and dielectric properties of lithium borate glasses

Highlights: • There is increase in NBOs with iron content. • FTIR spectra supported the results predicted by density. • Glass stability has been examined. • Iron shows “blocking effect” on migration of mobile ions. • Internal Circuit varies with temperature and composition. - Abstract: Glasses with composition xFe{sub 2}O{sub 3}·(30 − x)Li{sub 2}O·70B{sub 2}O{sub 3} (x = 0, 2, 5, 7 and 10 mol%) were prepared via melt-quenching technique and their physical, thermal and dielectric properties are discussed. XRD was carried out to confirm the amorphous nature of prepared glasses. Density (ρ) and molar volume (V{sub m}) were found to increase with increase in Fe{sub 2}O{sub 3} content. Infrared absorption spectra depicted that Fe{sub 2}O{sub 3} is acting as a network modifier. DTA has been carried out to determine glass transition temperature (T{sub g}) and crystallization temperature (T{sub x}). Electrical properties have been studied using impedance spectroscopy and dc conductivity. The dc conductivity decreases and activation energy increases on replacing Li{sup +} ions with Fe{sup 3+}. The impedance measurements reveal that the total conductivity obeys Jonscher’s power law. Study of the equivalent circuit analysis up to a temperature of 523 K shows a significant change in the equivalent circuitrymore » with change in temperature and composition.« less
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [4] ;  [5]
  1. Physics Department, Deenbandhu Chhotu Ram University of Science & Technology, Murthal 131039 (India)
  2. (India)
  3. Applied Physics Department, Guru Jambheshwar University of Science and Technology, Hisar 125001 (India)
  4. Retd Professor, Physics Department, Maharshi Dayanand University Rohtak 124001 (India)
  5. Physics Department, Baba Mast Nath University, Asthal Bohr 124001 (India)
Publication Date:
OSTI Identifier:
22475942
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 70; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTRA; ABSORPTION SPECTROSCOPY; ACTIVATION ENERGY; BORATES; CRYSTALLIZATION; DENSITY; DIELECTRIC PROPERTIES; DIFFERENTIAL THERMAL ANALYSIS; FOURIER TRANSFORMATION; GLASS; INFRARED SPECTRA; IRON ADDITIONS; IRON OXIDES; LITHIUM COMPOUNDS; LITHIUM OXIDES; TRANSITION TEMPERATURE; X-RAY DIFFRACTION