Refereed Articles
Pressure-induced Elastic Softening of Monocrystalline Zirconium Tungstate at  300 K
  The elastic tensor of monocrystalline ZrW2O8 was determined near 300  K as a function of pressure, using pulse-echo ultrasound in a large-volume moissanite anvil cell. An unusual decrease in bulk modulus with increased pressure was observed. A framework-solid-based nonlinear model with many degrees of freedom predicts the observed behavior. We also observe that ReO3, a similar framework solid but lacking the necessary degrees of freedom, fails to display softening. Additionally, the pressure-induced phase transition from alpha-ZrW2O8 (cubic) to gamma-ZrW2O8 (orthorhombic) is found to take place at [approximate]0.5  GPa, a result confirmed by Raman spectroscopy.  
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|Formatted Citation|

 
  Pressure-induced Elastic Softening of Monocrystalline Zirconium Tungstate at  300 K, C. Pantea, A. Migliori, P. Littlewood, Y. Zhao, H. Ledbetter, J. Lashley, T. Kimura, J. Van Duijn, G. Kowach, Physical Review B:Condensed Matter and Materials Physics, 2006, 73, 214118/1.