Synthesis and characterization of niobium-doped potassium tetragonal tungsten bronzes, K x Nb y W1-y O3

Research output: Contribution to journal › Article › Research › peer review

Authors

  • Tapas Debnath
  • Subrata Chandra Roy
  • Claus H. Rüscher
  • Altaf Hussain

Research Organisations

External Research Organisations

  • University of Dhaka
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Details

Original languageEnglish
Pages (from-to)179-185
Number of pages7
JournalJournal of materials science
Volume44
Issue number1
Publication statusPublished - Jan 2009

Abstract

Needle-shaped crystals of sizes up to 5 μm × 5 μm × 40 μm of nominal composition K x Nb y W1-y O3 were synthesized by solid state method at 800 °C using appropriate amount of WO3, WO2, Nb2O 5, and K2WO4. The samples were characterized with XRD, SEM, microprobe analysis, optical spectroscopy, and Raman spectroscopy. The XRD patterns of the samples show single phase of tetragonal tungsten bronze (TTB) type (P4/mbm, No. 127) up to y = 0.07. Structure refinements reveal an increase in cell parameter with increasing nominal niobium content within the TTB phase. The elemental compositions of the crystals determined by electron microprobe analysis also show an increase in Nb content with increasing y. With increasing Nb content the reflectivity minimum in the near infrared spectral range shifts towards lower wavenumber indicating the effect of decreasing carrier concentration. Pyrochlore type phase (KNbWO 6) is obtained as a second phase when nominal composition y > 0.07.

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Cite this

Synthesis and characterization of niobium-doped potassium tetragonal tungsten bronzes, K x Nb y W1-y O3. / Debnath, Tapas; Roy, Subrata Chandra; Rüscher, Claus H. et al.
In: Journal of materials science, Vol. 44, No. 1, 01.2009, p. 179-185.

Research output: Contribution to journal › Article › Research › peer review

Debnath T, Roy SC, Rüscher CH, Hussain A. Synthesis and characterization of niobium-doped potassium tetragonal tungsten bronzes, K x Nb y W1-y O3. Journal of materials science. 2009 Jan;44(1):179-185. doi: 10.1007/s10853-008-3101-4
Debnath, Tapas ; Roy, Subrata Chandra ; Rüscher, Claus H. et al. / Synthesis and characterization of niobium-doped potassium tetragonal tungsten bronzes, K x Nb y W1-y O3. In: Journal of materials science. 2009 ; Vol. 44, No. 1. pp. 179-185.
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abstract = "Needle-shaped crystals of sizes up to 5 μm × 5 μm × 40 μm of nominal composition K x Nb y W1-y O3 were synthesized by solid state method at 800 °C using appropriate amount of WO3, WO2, Nb2O 5, and K2WO4. The samples were characterized with XRD, SEM, microprobe analysis, optical spectroscopy, and Raman spectroscopy. The XRD patterns of the samples show single phase of tetragonal tungsten bronze (TTB) type (P4/mbm, No. 127) up to y = 0.07. Structure refinements reveal an increase in cell parameter with increasing nominal niobium content within the TTB phase. The elemental compositions of the crystals determined by electron microprobe analysis also show an increase in Nb content with increasing y. With increasing Nb content the reflectivity minimum in the near infrared spectral range shifts towards lower wavenumber indicating the effect of decreasing carrier concentration. Pyrochlore type phase (KNbWO 6) is obtained as a second phase when nominal composition y > 0.07.",
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T1 - Synthesis and characterization of niobium-doped potassium tetragonal tungsten bronzes, K x Nb y W1-y O3

AU - Debnath, Tapas

AU - Roy, Subrata Chandra

AU - Rüscher, Claus H.

AU - Hussain, Altaf

N1 - Funding Information: Acknowledgement AH is grateful to the Alexander von Humboldt Stiftung, Germany, and University Grants Commission, Bangladesh for financial support. TD thanks the ‘‘Land Niedersachsen’’, Germany for support with the ‘‘Lichtenberg Stipendium’’ for his Ph.D. research fellowship. Finally, the authors are thankful to two anonymous referees for their helpful comments.

PY - 2009/1

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N2 - Needle-shaped crystals of sizes up to 5 μm × 5 μm × 40 μm of nominal composition K x Nb y W1-y O3 were synthesized by solid state method at 800 °C using appropriate amount of WO3, WO2, Nb2O 5, and K2WO4. The samples were characterized with XRD, SEM, microprobe analysis, optical spectroscopy, and Raman spectroscopy. The XRD patterns of the samples show single phase of tetragonal tungsten bronze (TTB) type (P4/mbm, No. 127) up to y = 0.07. Structure refinements reveal an increase in cell parameter with increasing nominal niobium content within the TTB phase. The elemental compositions of the crystals determined by electron microprobe analysis also show an increase in Nb content with increasing y. With increasing Nb content the reflectivity minimum in the near infrared spectral range shifts towards lower wavenumber indicating the effect of decreasing carrier concentration. Pyrochlore type phase (KNbWO 6) is obtained as a second phase when nominal composition y > 0.07.

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