title: Crystal Structures Adopted by Black Phosphorus at High Pressures.
abstract: 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.
authors.forename: J C
authors.initials: JC
authors.lastname: Jamieson