Enhancement of electrical conductivity and chemical durability of 20R 2O•10Fe2O3•xWO3•(70 - X)V2O5 glass (R = Na, K) caused by structural relaxation

Shiro Kubuki, Koken Matsuda, Kazuhiko Akiyama, Z. Homonnay, Katalin Sinkó, E. Kuzmann, Tetsuaki Nishida

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A relationship between local structure, thermal endurance, chemical durability and electrical conductivity of alkaline iron tungsten vanadate glass, 20R2O•10Fe2O3•xWO 3•(70 - x)V2O5, R = Na and K, x = 0-50 mol.%, abbreviated as RFWV was investigated by 57Fe-Mössbauer spectroscopy, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), leaching test using 20 vol.% HCl and dc-probe method. Mössbauer spectra of 20Na 2O•10Fe2O3•xWO3•(70 - x)V2O5 glass (NFWV) consisted of one paramagnetic doublet with a stable isomer shift (δ) of 0.40 mm s- 1 and an increasing quadrupole splitting (Δ) from 0.68 to 0.82 mm s- 1 with the increase of "x" from 0 to 50 mol.%, indicating that local distortion of FeIIIO4 tetrahedra increased with WO 3 content. After isothermal annealing at 500 C for 100 min, Δ decreased to 0.62, 0.59, 0.67 and 0.67 mm s- 1 for NFWV glass with "x" of 0, 10, 20 and 30, showing that local distortion of Fe IIIO4 tetrahedra was reduced due to the structural relaxation. Original NFWV glass exhibited a slightly decreasing electrical conductivity (σ) from 2.9 × 10- 6 to 5.5 × 10 - 8 S cm- 1 with the increase of "x" from 0 to 50. The isothermal annealing of NFWV glass caused a remarkable increase in σ of 4.5 × 10- 3, 6.2 × 10- 4 and 9.8 × 10- 4 S cm- 1 with "x" of 0, 10 and 20, all of which showed a small activation energy for electron hopping (W H) of 0.21, 0.20 and 0.15 eV, respectively. On the other hand, increases in glass transition temperature (Tg), crystallization temperature (Tc) and activation energy for crystallization (E a) were observed for NFWV glass with WO3 content, proving that the tungsten ion contributes to enhancement of chemical bond strength of NFWV glass. Similar results of an increase in σ and a decrease in dissolution rate due to annealing were observed for KFWV glass. It is concluded that structure, physical and chemical properties of RFWV glass can be controlled by introduction of WO3.

Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalJournal of Non-Crystalline Solids
Volume378
DOIs
Publication statusPublished - 2013

Fingerprint

Structural relaxation
durability
Durability
Glass
electrical resistivity
augmentation
glass
Isothermal annealing
Tungsten
Crystallization
tetrahedrons
annealing
tungsten
Activation energy
crystallization
activation energy
Electric Conductivity
vanadium pentoxide
Vanadates
vanadates

Keywords

  • Fe-Mössbauer spectroscopy
  • Chemical durability
  • Electrical conductivity
  • Structural relaxation
  • Vanadate glass

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Enhancement of electrical conductivity and chemical durability of 20R 2O•10Fe2O3•xWO3•(70 - X)V2O5 glass (R = Na, K) caused by structural relaxation. / Kubuki, Shiro; Matsuda, Koken; Akiyama, Kazuhiko; Homonnay, Z.; Sinkó, Katalin; Kuzmann, E.; Nishida, Tetsuaki.

In: Journal of Non-Crystalline Solids, Vol. 378, 2013, p. 227-233.

Research output: Contribution to journalArticle

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abstract = "A relationship between local structure, thermal endurance, chemical durability and electrical conductivity of alkaline iron tungsten vanadate glass, 20R2O•10Fe2O3•xWO 3•(70 - x)V2O5, R = Na and K, x = 0-50 mol.{\%}, abbreviated as RFWV was investigated by 57Fe-M{\"o}ssbauer spectroscopy, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), leaching test using 20 vol.{\%} HCl and dc-probe method. M{\"o}ssbauer spectra of 20Na 2O•10Fe2O3•xWO3•(70 - x)V2O5 glass (NFWV) consisted of one paramagnetic doublet with a stable isomer shift (δ) of 0.40 mm s- 1 and an increasing quadrupole splitting (Δ) from 0.68 to 0.82 mm s- 1 with the increase of {"}x{"} from 0 to 50 mol.{\%}, indicating that local distortion of FeIIIO4 tetrahedra increased with WO 3 content. After isothermal annealing at 500 C for 100 min, Δ decreased to 0.62, 0.59, 0.67 and 0.67 mm s- 1 for NFWV glass with {"}x{"} of 0, 10, 20 and 30, showing that local distortion of Fe IIIO4 tetrahedra was reduced due to the structural relaxation. Original NFWV glass exhibited a slightly decreasing electrical conductivity (σ) from 2.9 × 10- 6 to 5.5 × 10 - 8 S cm- 1 with the increase of {"}x{"} from 0 to 50. The isothermal annealing of NFWV glass caused a remarkable increase in σ of 4.5 × 10- 3, 6.2 × 10- 4 and 9.8 × 10- 4 S cm- 1 with {"}x{"} of 0, 10 and 20, all of which showed a small activation energy for electron hopping (W H) of 0.21, 0.20 and 0.15 eV, respectively. On the other hand, increases in glass transition temperature (Tg), crystallization temperature (Tc) and activation energy for crystallization (E a) were observed for NFWV glass with WO3 content, proving that the tungsten ion contributes to enhancement of chemical bond strength of NFWV glass. Similar results of an increase in σ and a decrease in dissolution rate due to annealing were observed for KFWV glass. It is concluded that structure, physical and chemical properties of RFWV glass can be controlled by introduction of WO3.",
keywords = "Fe-M{\"o}ssbauer spectroscopy, Chemical durability, Electrical conductivity, Structural relaxation, Vanadate glass",
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T1 - Enhancement of electrical conductivity and chemical durability of 20R 2O•10Fe2O3•xWO3•(70 - X)V2O5 glass (R = Na, K) caused by structural relaxation

AU - Kubuki, Shiro

AU - Matsuda, Koken

AU - Akiyama, Kazuhiko

AU - Homonnay, Z.

AU - Sinkó, Katalin

AU - Kuzmann, E.

AU - Nishida, Tetsuaki

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N2 - A relationship between local structure, thermal endurance, chemical durability and electrical conductivity of alkaline iron tungsten vanadate glass, 20R2O•10Fe2O3•xWO 3•(70 - x)V2O5, R = Na and K, x = 0-50 mol.%, abbreviated as RFWV was investigated by 57Fe-Mössbauer spectroscopy, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), leaching test using 20 vol.% HCl and dc-probe method. Mössbauer spectra of 20Na 2O•10Fe2O3•xWO3•(70 - x)V2O5 glass (NFWV) consisted of one paramagnetic doublet with a stable isomer shift (δ) of 0.40 mm s- 1 and an increasing quadrupole splitting (Δ) from 0.68 to 0.82 mm s- 1 with the increase of "x" from 0 to 50 mol.%, indicating that local distortion of FeIIIO4 tetrahedra increased with WO 3 content. After isothermal annealing at 500 C for 100 min, Δ decreased to 0.62, 0.59, 0.67 and 0.67 mm s- 1 for NFWV glass with "x" of 0, 10, 20 and 30, showing that local distortion of Fe IIIO4 tetrahedra was reduced due to the structural relaxation. Original NFWV glass exhibited a slightly decreasing electrical conductivity (σ) from 2.9 × 10- 6 to 5.5 × 10 - 8 S cm- 1 with the increase of "x" from 0 to 50. The isothermal annealing of NFWV glass caused a remarkable increase in σ of 4.5 × 10- 3, 6.2 × 10- 4 and 9.8 × 10- 4 S cm- 1 with "x" of 0, 10 and 20, all of which showed a small activation energy for electron hopping (W H) of 0.21, 0.20 and 0.15 eV, respectively. On the other hand, increases in glass transition temperature (Tg), crystallization temperature (Tc) and activation energy for crystallization (E a) were observed for NFWV glass with WO3 content, proving that the tungsten ion contributes to enhancement of chemical bond strength of NFWV glass. Similar results of an increase in σ and a decrease in dissolution rate due to annealing were observed for KFWV glass. It is concluded that structure, physical and chemical properties of RFWV glass can be controlled by introduction of WO3.

AB - A relationship between local structure, thermal endurance, chemical durability and electrical conductivity of alkaline iron tungsten vanadate glass, 20R2O•10Fe2O3•xWO 3•(70 - x)V2O5, R = Na and K, x = 0-50 mol.%, abbreviated as RFWV was investigated by 57Fe-Mössbauer spectroscopy, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), leaching test using 20 vol.% HCl and dc-probe method. Mössbauer spectra of 20Na 2O•10Fe2O3•xWO3•(70 - x)V2O5 glass (NFWV) consisted of one paramagnetic doublet with a stable isomer shift (δ) of 0.40 mm s- 1 and an increasing quadrupole splitting (Δ) from 0.68 to 0.82 mm s- 1 with the increase of "x" from 0 to 50 mol.%, indicating that local distortion of FeIIIO4 tetrahedra increased with WO 3 content. After isothermal annealing at 500 C for 100 min, Δ decreased to 0.62, 0.59, 0.67 and 0.67 mm s- 1 for NFWV glass with "x" of 0, 10, 20 and 30, showing that local distortion of Fe IIIO4 tetrahedra was reduced due to the structural relaxation. Original NFWV glass exhibited a slightly decreasing electrical conductivity (σ) from 2.9 × 10- 6 to 5.5 × 10 - 8 S cm- 1 with the increase of "x" from 0 to 50. The isothermal annealing of NFWV glass caused a remarkable increase in σ of 4.5 × 10- 3, 6.2 × 10- 4 and 9.8 × 10- 4 S cm- 1 with "x" of 0, 10 and 20, all of which showed a small activation energy for electron hopping (W H) of 0.21, 0.20 and 0.15 eV, respectively. On the other hand, increases in glass transition temperature (Tg), crystallization temperature (Tc) and activation energy for crystallization (E a) were observed for NFWV glass with WO3 content, proving that the tungsten ion contributes to enhancement of chemical bond strength of NFWV glass. Similar results of an increase in σ and a decrease in dissolution rate due to annealing were observed for KFWV glass. It is concluded that structure, physical and chemical properties of RFWV glass can be controlled by introduction of WO3.

KW - Fe-Mössbauer spectroscopy

KW - Chemical durability

KW - Electrical conductivity

KW - Structural relaxation

KW - Vanadate glass

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