Abstract：
:Silicon dioxide is one of the most abundant natural compounds. Polymorphs of SiO₂ and their phase transitions have long been a focus of great interest and intense theoretical and experimental pursuits. Here, compressing single-crystal coesite SiO₂ under hydrostatic pressures of 26-53 GPa at room temperature, we discover a new polymorphic phase transition mechanism of coesite to post-stishovite, by means of single-crystal synchrotron X-ray diffraction experiment and first-principles computational modelling. The transition features the formation of multiple previously unknown triclinic phases of SiO₂ on the transition pathway as structural intermediates. Coexistence of the low-symmetry phases results in extensive splitting of the original coesite X-ray diffraction peaks that appear as dramatic peak broadening and weakening, resembling an amorphous material. This work sheds light on the long-debated pressure-induced amorphization phenomenon of SiO₂, but also provides new insights into the densification mechanism of tetrahedrally bonded structures common in nature.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Hu QY,Shu JF,Cadien A,Meng Y,Yang WG,Sheng HW,Mao HKdoi
10.1038/ncomms7630subject
Has Abstractpub_date
2015-03-20 00:00:00pages
6630issn
2041-1723pii
ncomms7630journal_volume
6pub_type
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