NDLI: Electrical conductivity and local structure of lithium iron tungsten vanadate glass

Content Provider	Springer Nature Link
Author	Matsuda, Koken Kubuki, Shiro Akiyama, Kazuhiko Homonnay, Zoltán Kuzmann, Ernő Nishida, Tetsuaki
Copyright Year	2013
Abstract	A relationship between physical properties and local structure of 20Li2O·10Fe2O3·xWO3·(70–x)V2O5 glass, abbreviated as xLFWV glass (x = 0 − 25 in mol%), was investigated by 57Fe-Mössbauer spectroscopy, Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), leaching test using 20 vol% HCl and DC two- or four-probe method. 57Fe-Mössbauer spectra of xLFWV glass showed an increase of quadrupole splitting (Δ) from 0.67 to 0.73±0.02 mm s − 1 and a constant isomer shift (δ) of 0.39±0.01 mm s − 1 with an increase of ‘x’ from 0 to 25. This suggests that FeIIIO4 tetrahedra gradually increase their local distortion along with a substitution of WO3 for V2O5. DTA of xLFWV glass showed an increase in glass transition temperature (T g) from 252 to 298 $_{\pm 5}^{\circ}$ C with an increase of ‘x’. Composition dependency of T g and Δ indicates that FeIII atoms occupy substitutional sites of WO6 octahedra as network former (NWF), since a large slope of 680 K (mm s − 1) − 1 was obtained in T g − Δ plot. Comparable electrical conductivities (σ) of 2.5 × 10 − 6, 1.9 × 10 − 6, 8.4 × 10 − 7 and 2.9 × 10 − 6 S cm − 1 obtained for xLFWV glasses with ‘x’ of 0, 10, 20 and 25, respectively increased to 2.4 × 10 − 2, 2.4 × 10 − 3, 3.5 × 10 − 4 and 8.8 × 10 − 5 S cm − 1 after annealing at 400 °C for 100 min. Smaller Δ values of 0.58 and 0.67±0.02 mm s − 1 obtained in annealed xLFWV glasses with ‘x’ of 0 and 10, respectively indicate that structural relaxation occurs in VO4 units of vanadate glass units, as had been observed in other vanadate glasses.
Starting Page	755
Ending Page	763
Page Count	9
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	226
Issue Number	1-3
e-ISSN	15729540
Language	English
Publisher	Springer International Publishing
Publisher Date	2013-10-30
Publisher Place	Cham
Access Restriction	Subscribed
Subject Keyword	Lithium iron tungsten vanadate glass 57Fe-Mössbauer spectroscopy Electrical conductivity Nuclear Physics, Heavy Ions, Hadrons Atomic, Molecular, Optical and Plasma Physics Condensed Matter Physics Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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