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High-pressure, high-temperature single-crystal study of Bi-IV

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Original languageEnglish
Pages (from-to)442-449
Number of pages8
JournalHigh Pressure Research
Issue number3
Publication statusPublished - 2012


Bi-IV is the stable high-pressure, high-temperature phase of bismuth at similar to 4 GPa and similar to 500 K. It was first identified in 1958, but its structure has remained uncertain. An X-ray powder-diffraction study of Bi-IV reported the structure as monoclinic, but a subsequent reinterpretation of the same data concluded that the structure was C-centred orthorhombic (oC16), with the same atomic arrangement as in Cs-V and Si-VI. To resolve the uncertainty over the structure of Bi-IV, we investigated this phase at 3.2 GPa and 465 K by single-crystal synchrotron X-ray diffraction. All of the observed reflections could be indexed on the orthorhombic oC16 structure proposed by Degtyareva, with a = 11.191(5)angstrom, b = 6.622(1)angstrom and c = 6.608(1)angstrom. The spacegroup was confirmed as Cmce. Refinement of the data resulted in an excellent fit (R = 2.8%), and gave atomic coordinates very similar to those of the oC16 structures in Cs-V and Si-VI.

    Research areas

  • bismuth, crystal structure, high-pressure, high temperature, X-ray diffraction, BISMUTH, PHASE, ANVIL, POLYMORPHISM, ELEMENTS, METALS, KBAR, RUBY, CELL, VI

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