Abstract
The elastic tensor of monocrystalline ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ was determined near $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ 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 ${\mathrm{ReO}}_{3}$, a similar framework solid but lacking the necessary degrees of freedom, fails to display softening. Additionally, the pressure-induced phase transition from $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ (cubic) to $\ensuremath{\gamma}\text{\ensuremath{-}}{\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ (orthorhombic) is found to take place at $\ensuremath{\approx}0.5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, a result confirmed by Raman spectroscopy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
