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Journal of Materials Science

, Volume 42, Issue 10, pp 3383–3387 | Cite as

Polycrystalline materials in MoO3–ZrO2–V2O5 system

  • M. Markova-VelichkovaEmail author
  • R. Iordanova
  • A. Stoyanova
  • Y. Dimitriev
  • D. Klissurski
Size-Dependent Effects
  • 110 Downloads

Abstract

Melt quenching technique was applied to study tendency for phase formation and amorphization in the MoO3–ZrO2–V2O5 system. By X-ray diffraction were detected the main crystalline phases separated during the quenching: Zr(MoO4)2, V2MoO8, (Mo0.3V0.7)2O5, V0.95Mo0.97O5 but in a wide concentration range the dominant crystalline phase was monoclinic ZrO2. The average particle sizes of the obtained crystal phases were in the range 30–50 nm. A narrow glass formation area was situated, near MoO3–V2O5 side. The glass-crystalline samples were obtained in the MoO3- and V2O5-rich compositions. The phase formation was proven by IR analysis also. IR data showed that the main structural units built up the glass network are corner shared VO5 and MoO6 groups while in the corresponding crystal V2MoO8 phase MeO6 (Me = V, Mo) octahedra are corner and edge shared (band at 580 cm−1).

Keywords

MoO3 V2O5 Wide Concentration Range Negative Thermal Expansion Monoclinic ZrO2 

Notes

Acknowledgments

This work was financial supported by contract 25/2006, Medical University, Pleven, Bulgaria

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • M. Markova-Velichkova
    • 1
    Email author
  • R. Iordanova
    • 1
  • A. Stoyanova
    • 2
  • Y. Dimitriev
    • 3
  • D. Klissurski
    • 1
  1. 1.Institute of General and Inorganic ChemistryBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Department of Chemistry and BiochemistryMedical UniversityPlevenBulgaria
  3. 3.University of Chemical Technology and MetallurgySofiaBulgaria

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