Te-II, the high-pressure phase of tellurium stable between 4 and 70.3em0exGPa, is found to have a triclinic structure that is previously unknown in the elements, but which is closely related to the incommensurate Te-III structure. Se-III is found to be isostructural with Te-II. The appearance of additional weak reflections in Te-II profiles below 4.3(1)0.3em0exGPa suggests the existence of a previously unknown phase which might be related to Se-II.
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Hejny et al. (2004) studied this question.
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