57Fe-Mössbauer study of electrically conducting barium iron vanadate glass after heat treatment

Shiro Kubuki, Hiroshi Sakka, Kanako Tsuge, Z. Homonnay, Katalin Sinkó, E. Kuzmann, Hiroki Yasumitsu, Tetsuaki Nishida

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Local structure and thermal durability of semiconducting xBaO•(90∈- x)V2O5 • 10Fe2O 3 glasses (x = 20, 30 and 40), NTA glass TM, before and after isothermal annealing were investigated by 57Fe-Mössbauer spectroscopy and differential thermal analysis (DTA). An identical isomer shift ( δ ) of 0.39 ± 0.01 mm s∈-∈1 and a systematic increase in the quadrupole splitting (Δ) were observed from 0.70 ± 0.02 to 0.80 ± 0.02 mm s∈-∈1 with an increasing BaO content, showing an increase in the local distortion of FeIIIO 4 tetrahedra. From the slope of the straight line in the T g-Δ plot of NTA glass TM, it proved that Fe III plays a role of network former. Large Debye temperature (Θ D) values of 1000 and 486 K were respectively obtained for 20BaO • 70V2O5 • 10Fe2O3 glass before and after isothermal annealing at 400°C for 60 min, respectively. This result also suggests that FeIII atoms constitute the glass network composed of tetrahedral FeO4, tetrahedral VO4 and pyramidal VO5 units. The electric conductivity of 20BaO • 70V2O5 • 10Fe2O3 glass increased from 1.6 × 10∈-∈5 to 5.8 × 10 ∈-∈2 S cm∈-∈1 after isothermal annealing at 450°C for 2,000 min. These results suggest that the drastic increase in the electric conductivity caused by heat treatment is closely related to the structural relaxation of the glass network structure.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalHyperfine Interactions
Volume185
Issue number1-3
DOIs
Publication statusPublished - Jul 2008

Fingerprint

Vanadates
vanadates
Barium
barium
heat treatment
Iron
Heat treatment
iron
conduction
Glass
glass
Isothermal annealing
annealing
Debye temperature
conductivity
Structural relaxation
durability
tetrahedrons
Isomers
Differential thermal analysis

Keywords

  • Fe-Mössbauer spectroscopy
  • Barium iron vanadate glass
  • Debye temperature
  • Electric conductivity
  • Structural relaxation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

57Fe-Mössbauer study of electrically conducting barium iron vanadate glass after heat treatment. / Kubuki, Shiro; Sakka, Hiroshi; Tsuge, Kanako; Homonnay, Z.; Sinkó, Katalin; Kuzmann, E.; Yasumitsu, Hiroki; Nishida, Tetsuaki.

In: Hyperfine Interactions, Vol. 185, No. 1-3, 07.2008, p. 115-121.

Research output: Contribution to journalArticle

Kubuki, Shiro ; Sakka, Hiroshi ; Tsuge, Kanako ; Homonnay, Z. ; Sinkó, Katalin ; Kuzmann, E. ; Yasumitsu, Hiroki ; Nishida, Tetsuaki. / 57Fe-Mössbauer study of electrically conducting barium iron vanadate glass after heat treatment. In: Hyperfine Interactions. 2008 ; Vol. 185, No. 1-3. pp. 115-121.
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AU - Kubuki, Shiro

AU - Sakka, Hiroshi

AU - Tsuge, Kanako

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AU - Sinkó, Katalin

AU - Kuzmann, E.

AU - Yasumitsu, Hiroki

AU - Nishida, Tetsuaki

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N2 - Local structure and thermal durability of semiconducting xBaO•(90∈- x)V2O5 • 10Fe2O 3 glasses (x = 20, 30 and 40), NTA glass TM, before and after isothermal annealing were investigated by 57Fe-Mössbauer spectroscopy and differential thermal analysis (DTA). An identical isomer shift ( δ ) of 0.39 ± 0.01 mm s∈-∈1 and a systematic increase in the quadrupole splitting (Δ) were observed from 0.70 ± 0.02 to 0.80 ± 0.02 mm s∈-∈1 with an increasing BaO content, showing an increase in the local distortion of FeIIIO 4 tetrahedra. From the slope of the straight line in the T g-Δ plot of NTA glass TM, it proved that Fe III plays a role of network former. Large Debye temperature (Θ D) values of 1000 and 486 K were respectively obtained for 20BaO • 70V2O5 • 10Fe2O3 glass before and after isothermal annealing at 400°C for 60 min, respectively. This result also suggests that FeIII atoms constitute the glass network composed of tetrahedral FeO4, tetrahedral VO4 and pyramidal VO5 units. The electric conductivity of 20BaO • 70V2O5 • 10Fe2O3 glass increased from 1.6 × 10∈-∈5 to 5.8 × 10 ∈-∈2 S cm∈-∈1 after isothermal annealing at 450°C for 2,000 min. These results suggest that the drastic increase in the electric conductivity caused by heat treatment is closely related to the structural relaxation of the glass network structure.

AB - Local structure and thermal durability of semiconducting xBaO•(90∈- x)V2O5 • 10Fe2O 3 glasses (x = 20, 30 and 40), NTA glass TM, before and after isothermal annealing were investigated by 57Fe-Mössbauer spectroscopy and differential thermal analysis (DTA). An identical isomer shift ( δ ) of 0.39 ± 0.01 mm s∈-∈1 and a systematic increase in the quadrupole splitting (Δ) were observed from 0.70 ± 0.02 to 0.80 ± 0.02 mm s∈-∈1 with an increasing BaO content, showing an increase in the local distortion of FeIIIO 4 tetrahedra. From the slope of the straight line in the T g-Δ plot of NTA glass TM, it proved that Fe III plays a role of network former. Large Debye temperature (Θ D) values of 1000 and 486 K were respectively obtained for 20BaO • 70V2O5 • 10Fe2O3 glass before and after isothermal annealing at 400°C for 60 min, respectively. This result also suggests that FeIII atoms constitute the glass network composed of tetrahedral FeO4, tetrahedral VO4 and pyramidal VO5 units. The electric conductivity of 20BaO • 70V2O5 • 10Fe2O3 glass increased from 1.6 × 10∈-∈5 to 5.8 × 10 ∈-∈2 S cm∈-∈1 after isothermal annealing at 450°C for 2,000 min. These results suggest that the drastic increase in the electric conductivity caused by heat treatment is closely related to the structural relaxation of the glass network structure.

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