Phosphorus:: New in situ powder data from large-volume apparatus

Improved X-ray powder diffraction data for orthorhombic phosphorus, S.G. Cmca (64) obtained in situ at synthesis conditions of 1.2 GPa and 1100 K, are described. Representative, as synthesized, data include 2.552(X), 3.320(4), 2.595(3), 5.191(2), 1.630(2), for least-squares unit-cell a=3.3182(6) Angstrom, b= 10.3744(18) Angstrom and c=4.3227(9) Angstrom. As an illustration of the quality of the data, the structure was solved from powder XRD and Rietveld refined to give a=3.3199(2) Angstrom, b= 10.3678(4) Angstrom, c=4.3154(2)Angstrom, and V=148.535(12) Angstrom(3) with the P atom on 8f (1/2, y,z) with y=0.1044(22) and z=0.9179(7). (C) 2003 International Centre for Diffraction Data.