Compression mechanisms in. cap alpha. -quartz structures: SiO/sub 2/ and GeO/sub 2/

Journal Article · Wed Nov 01 04:00:00 EST 1978 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.324517· OSTI ID:6824245

Jorgensen, J D

Interatomic distances and angles have been measured at pressures to about 25 kbars for the ..cap alpha..-quartz forms of SiO/sub 2/ and GeO/sub 2/ using time-of-flight powder neutron diffraction. The data show that the compression of SiO/sub 2/ results solely from a cooperative rotation or tilting of the SiO/sub 4/ tetrahedra around their shared oxygen corners, with individual tetrahedra remaining relatively rigid. Conversely, the compression of GeO/sub 2/ results almost solely from distortions of the individual tetrahedra resulting from changes in O-Ge-O angles with cooperative rotations contributing a negligible amount.

• Research Organization: Solid State Science Division, Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 6824245
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 49:11; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CHALCOGENIDES
COHERENT SCATTERING
COMPRESSION
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
DISTANCE
GERMANIUM COMPOUNDS
GERMANIUM OXIDES
INTERATOMIC DISTANCES
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
TIME-OF-FLIGHT METHOD
VERY HIGH PRESSURE