Images of amorphous red phosphorus taken at 1 GPa and 9.7 GPa. Images are overlaid to highlight the change in observed area due to isotropic compression, resulting in ΔA = 47 250 pixels.
Equation of state measurements of cubic crystals: (a) cesium iodide and (b) sodium iodide. Black data points designate measurements in a diamond anvil cell using the microscopic technique described in this work. The red line represents data from Bridgman using a large volume press.3
Equation of state of As2O3 glass up to 6.5 GPa. A 3rd order Birch-Murnaghan equation of state is fitted to the data to give K0 = 11.3 and K0 ′ = 6.7. Inlay: Picture of gold coated As2O3 glass. A thin layer of sputter coated gold helps enhance the contrast between the glass and pressure medium when their refractive index and transparency are similar.
Compression (circles) and decompression (squares) of GeSe2 glass up to 7.3 GPa. A 3rd order Birch-Murnaghan equation of state is fitted to the data to give K0 = 14.2 and K0 ′ = 2.6.
Equation of state of red (amorphous) phosphorus measured using the technique described in this work. Multiple compression/decompression cycles were performed up to 10 GPa at 298 K. The black lines represent a 3rd order Birch-Murnaghan fit. The discontinuity around 8 GPa is a result of the phase transition from red to black phosphorus. A large hysteresis is noticed for both forms upon decompression.
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