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Journal of Applied Physics / Volume 97 / Issue 1 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

J. Appl. Phys. 97, 013508 (2005); http://dx.doi.org/10.1063/1.1819975 (8 pages)

Amorphization and decomposition of scandium molybdate at high pressure

Akhilesh K. Arora1, Takehiko Yagi2, Nobuyoshi Miyajima2, and T. A. Mary3

1Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
2Institute for Solid State Physics, Tokyo University, Kashowanoha, Kashiwa, Chiba 277-8581, Japan
3Department of Materials Sciences, California Institute of Technology, Pasadena, California 91125

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(Received 29 March 2004; accepted 23 September 2004; published online 13 December 2004)

The behavior of negative thermal-expansion material scandium molybdate Sc2(MoO4)3 is investigated at high pressure (HP) and high temperature (HT) using x-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The compound exhibits unusually high compressibility (bulk modulus ∼ 6 GPa) and undergoes amorphization at 12 GPa. On the other hand, in situ laser heating of amorphous samples inside the diamond-anvil cell is found to result in crystalline diffraction pattern and Raman spectrum different from those of the original compound. Upon release of the pressure subsequent to laser heating, the Raman spectrum and the diffraction pattern remain unchanged. Matching of several of the diffraction lines and Raman peaks in the laser-heated samples with those of MoO3 suggests a solid-state decomposition of the parent compound under HP-HT conditions into MoO3 and other compounds. Other diffraction lines are found to correspond to Sc2Mo2O9, Sc2O3, and the parent compound. Quantitative analysis of the characteristic x-ray emission from different regions of the sample during scanning electron microscopic observations is used for obtaining the compositions of the daughter compounds. The stoichiometries of two main phases are found to be close to those of MoO3 and Sc2Mo2O9. These results support the model that the pressure-induced amorphization occurred in this system because a pressure-induced decomposition was kinetically constrained.

© 2005 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL DETAILS
  3. RESULTS AND DISCUSSIONS
    1. Compression at ambient temperature
    2. Laser heating of amorphous samples
  4. SUMMARY AND CONCLUSIONS

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KEYWORDS and PACS

Keywords

scandium compounds, amorphisation, high-pressure effects, dissociation, high-temperature effects, thermal expansion, elastic moduli, stoichiometry, Raman spectra, X-ray emission spectra, X-ray diffraction, scanning electron microscopy, amorphous state, laser materials processing

PACS

  • 81.30.Hd

    Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder

  • 64.70.K-

    Solid-solid transitions

  • 62.50.-p

    High-pressure effects in solids and liquids

  • 82.30.Lp

    Decomposition reactions (pyrolysis, dissociation, and fragmentation)

  • 64.75.-g

    Phase equilibria

  • 81.40.Jj

    Elasticity and anelasticity, stress-strain relations

  • 61.66.Bi

    Elemental solids

  • 61.66.Dk

    Alloys

  • 78.30.Hv

    Other nonmetallic inorganics

  • 78.70.En

    X-ray emission spectra and fluorescence

  • 62.20.D-

    Elasticity

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1819975

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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