Anorganische, Struktur- und Physikalische Chemie

Monatshefte für Chemie / Chemical Monthly

, Volume 106, Issue 3, pp 755-762

First online:

Die Kristallstruktur der monoklinen Form von As2O3 (Claudetit II)

  • F. PertlikAffiliated withInstitut für Mineralogie und Kristallographie der Universität Wien

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The crystal structure of the monoclinic form ofAs 2O3(claudetite II)


Claudetite II crystallizes monoclinic (a 0=7.99,b 0=4.65,c 0=9.12 Å, β=78.3°;Z=4) with space group P21/n-C 2h 5 . AnR-factor of 0.07 was obtained from 568 observed independent reflections using individual anisotropic temperature factors. Each of the two crystallographically different As-atoms forms a flat trigonal pyramid with three oxygens. The pyramids are connected in two dimensions by common corners to form undulating sheets parallel to (001).