Abstract
In an attempt to grow large crystals of aluminum orthoarsenate (AlAsO4 by the hydrothermal method, a dense polycrystalline product resulted. The aggregate was in the form of fibrous crystallites in parallel arrangement which readily parted into fine, clear needles. Thermal decomposition analyses, chemical analysis, and powder and single crystal x-ray diffraction studies indicate this material to be a new hydrate of aluminum arsenate. The oxide formulation as determined by chemical analysis is:
An orthorhombic unit cell was established from rotation and Weissenberg studies as follows:
The systematically absent reflections indicate a body-centered unit cell; the possible space groups are:
Two molecules per unit cell gives a calculated density ρ = 3.27. The pycnometric density is 3.21.
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