Abstract
We present a structural study of single crystalline quartz-like α-GeO2 compressed to pressures up to 12 GPa and subsequently quenched to ambient conditions. The transition to a new crystalline phase with a distorted rutile structure, occurring in the pressure interval 8 to 12 GPa, was established. The structure of the new phase was identified from X-ray and electron diffraction data as P21/c monoclinic. Electron transmission and scanning microscopy provide direct evidence of the martensitic (or displacive) nature of the transition, indicating, in particular, the lamellar morphology and crystallographic orientation relation between the initial α-quartz and final new monoclinic phases. Upon heating, the new monoclinic phase transforms to the rutile-type structure with a similar (and similarly oriented) oxygen structure motif. Finally, we discuss the difference in high-pressure behavior of single-crystalline and polycrystalline samples transforming to the new crystalline and amorphous phases, respectively.
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From Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 71, No. 7, 2000, pp. 424–429.
Original English Text Copyright © 2000 by Brazhkin, Tat’yanin, Lyapin, Popova, Tsiok, Balitski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \).
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Brazhkin, V.V., Tat’yanin, E.V., Lyapin, A.G. et al. Martensitic transition in single-crystalline α-GeO2 at compression. Jetp Lett. 71, 293–297 (2000). https://doi.org/10.1134/1.568337
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DOI: https://doi.org/10.1134/1.568337