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Journal of Materials Science

, Volume 46, Issue 15, pp 5160–5164 | Cite as

Crystal structure and negative thermal expansion of solid solution Y2W3−xMoxO12

  • J. PengEmail author
  • M. M. Wu
  • F. L. Guo
  • S. B. Han
  • Y. T. Liu
  • D. F. Chen
  • X. H. Zhao
  • Z. Hu
Article

Abstract

A new series of solid solutions Y2W3−xMoxO12 (0.5 ≤ x ≤ 2.5) were successfully synthesized by the solid state method. Their crystal structure and negative thermal expansion properties were studied using high-temperature X-ray powder diffraction and the Rietveld method. All samples of rare earth tungstates and molybdates were found to crystallize in the same orthorhombic structure with space group Pnca, and show the negative thermal expansion phenomena related to transverse vibration of bridging oxygen atoms in the structure. Thermal expansion coefficients (TEC) of Y2W3−xMoxO12 were determined as −16.2 × 10−6 K−1 for x = 0.5 and −16.5 × 10−6 K−1 for x = 2.5 in the identical temperature range of 200–800 °C. High-temperature XRD data and bond length analysis suggest that the difference between W–O and Mo–O bond is responsible for the change of TECs after the element substitution in this series of solid solutions.

Keywords

Unit Cell Volume Rietveld Refinement Bridge Oxygen Atom Negative Thermal Expansion Thermal Expansion Property 

Notes

Acknowledgements

This study was financially supported by National Natural Science Foundation of China (NSFC) (Grant No. 10905095) and China Postdoctoral Science Foundation funded project (20080430556) and 973 Program (2006CB705600) are greatly appreciated.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • J. Peng
    • 1
    • 2
    Email author
  • M. M. Wu
    • 3
  • F. L. Guo
    • 4
  • S. B. Han
    • 3
  • Y. T. Liu
    • 3
  • D. F. Chen
    • 3
  • X. H. Zhao
    • 4
  • Z. Hu
    • 2
  1. 1.Experimental Physics CenterInstitute of High Energy Physics, CASBeijingChina
  2. 2.College of Chemistry and Chemical EngineeringGraduate University of the Chinese Academy of SciencesBeijingChina
  3. 3.China Institute of Atomic EnergyBeijingChina
  4. 4.College of ChemistryBeijing Normal UniversityBeijingChina

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