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Title: Mössbauer study of conductive oxide glass

Heat treatment of barium iron vanadate glass, BaO‐Fe{sub 2}O{sub 3}‐V{sub 2}O{sub 5}, at temperatures higher than crystallization temperature causes a marked decrease in resistivity (ρ) from several MΩcm to several Ωcm. {sup 57}Fe Mössbauer spectrum of heat-treated vanadate glass shows a marked decrease in quadrupole splitting (Δ) of Fe{sup III}, reflecting a structural relaxation, i.e., an increased symmetry of 'distorted' FeO{sub 4} and VO{sub 4} tetrahedra which are connected to each other by sharing corner oxygen atoms. Structural relaxation of 3D-network of vanadate glass accompanies a decrease in the activation energy for the conduction, reflecting a decreased energy gap between the donor level and conduction band. A marked increase in the conductivity was observed in CuO- or Cu{sub 2}O-containing barium iron vanadate glass after heat treatment at 450 °C for 30 min or more. 'n-type semiconductor model combined with small polaron hopping theory' was proposed in order to explain the high conductivity.
Authors:
;  [1] ;  [2]
  1. Tokyo Metropolitan University, Hachi-Oji, Tokyo 192-0397 (Japan)
  2. Kinki University, Iizuka, Fukuoka 820-8555 (Japan)
Publication Date:
OSTI Identifier:
22308100
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1622; Journal Issue: 1; Conference: Conference on Moessbauer spectroscopy in materials science 2014, Hlohovec u Breclavi (Czech Republic), 26-30 May 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; AFTER-HEAT; BARIUM OXIDES; COPPER OXIDES; CRYSTALLIZATION; ELECTRIC CONDUCTIVITY; ENERGY GAP; GLASS; HEAT TREATMENTS; IRON 57; IRON OXIDES; RELAXATION; SEMICONDUCTOR MATERIALS; TEMPERATURE DEPENDENCE; VANADATES