Abstract
Copper germanate has been examined by synchrotron X-ray powder diffraction at high pressure in a diamond anvil cell at pressures up to 220 kbar, and by infrared spectroscopy to 162 kbar. These concur in showing a phase transition at 66-73 kbar: the X-ray powder diffraction data have been indexed successfully on the basis of a P21/a cell, deduced from a model of the phase change in which germanate chains slip relative to each other along their axes. Slow changes in diffraction pattern form 110-220 kbar suggests existence of a further, very sluggish, phase change. CuGeO3 turns black near 5 kbar due to a band shift. Contraction of the orthorhombic cell constants of the initial phase is markedly anisotropic, the principal changes being in the plane which contains the long Cu-O bonds. These are twice as easily compressed as the short Cu-O bonds.
Sign-in/Register to access full text options 
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.
