Search for structural phase transitions in the molecular phases of bromine and iodine under high pressure

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We have succeeded in taking powder x-ray diffraction patterns of solid bromine under high pressure with a He-pressure medium. The obtained patterns showed no evidence of structural phase transitions around25and65GPa, which have been proposed in previous high-pressure experiments. Our data, however, still contain sizable errors in atomic positional coordinates. This comes from the uncertainty in diffraction intensity scattered by large powder crystallites. Accordingly, we cannot conclude the absence of structural phase transitions in the molecular phase of bromine from the present experimental data.