Crystal Structures Adopted by Black Phosphorus at High Pressures

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Science  29 Mar 1963:
Vol. 139, Issue 3561, pp. 1291-1292
DOI: 10.1126/science.139.3561.1291


Black phosphorus undergoes two reversible structural transitions at high pressures. The first is to a structure of the type arsenic A7. This structure is transformed to a simple cubic structure at higher pressures. The reversibility between the A7 and simple cubic structures at 111 kilobars indicates that the transition obtainable at this pressure provides a good calibration point by which high-pressure x-ray data may be united with volumetric or resistance measurements, or both.