Structural Chemistry of .GAMMA.-P4, a Low Temperature Modification of White Phosphorus
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Accession number;06A0548456
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| Title;Structural Chemistry of .GAMMA.-P4, a Low Temperature Modification of White Phosphorus |
| Author;
OKUDERA HIROKI
(Kanazawa Univ., Graduate School of Natural Sci. & Technol., JPN)
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Journal Title;Journal of the Crystallographic Society of Japan
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Journal Code:G0232A
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ISSN:0369-4585
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VOL.48;NO.3;PAGE.224-229(2006)
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| Figure&Table&Reference;FIG.7, TBL.2, REF.17 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The crystal structure of .GAMMA.-P4, one of three modifications hitherto reported on white phosphorus was determined from X-ray powder diffraction data collected at T=123 K on a Guinier-Simon camera equipped with a cold gas blower and an image plate detector. The crystal structure of .GAMMA.-P4 was solved by the method of simulated annealing, and the subsequent Rietveld refinement in the range 12.DEG. < 2.THETA. < 92.DEG. employing rigid-body constraints on the P4 molecule converged at Rp=3.8%, wRp=5.0%, and RF'2'=14.0%. The asymmetric unit of .GAMMA.-P4 contains three P atoms; two P atoms in a molecule are related by a mirror plane which bisects the molecule. The centers of gravity of these P4 molecules show a distorted body-centered cubic (bcc) arrangement. The four apices of the P4 tetrahedron point to the largest possible voids formed by neighbor molecules. The difference to the crystal structure of SiF4 and GeF4 with an exact bcc arrangement of tetrahedral molecules is discussed as well as, in terms of layer stackings, the similarity of the structures of .GAMMA.- and .BETA.-P4. (author abst.) |
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