Crystal structure of urusovite Cu[AlAsO₅: A new type of a tetrahedral aluminoarsenate polyanion

Authors: Krivovichev, S.; Molchanov, A.; Filatov, S.

Source: Crystallography Reports, Volume 45, Number 5, September 2000 , pp. 723-727(5)

Publisher: MAIK Nauka/Interperiodica

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Abstract:

The crystal structure of the new mineral urusovite Cu[AlAsO₅] has been determined (monoclinic system, sp. gr. P2₁/c, a = 7.335(1) Å, b = 10.255(1) Å, c = 5.599(1) Å, β = 99.79(1)°, V = 415.0(1) Å³, Z = 4). The structure is solved by direct methods and refined to R = 0.048 (wR = 0.103). The structure is built by open-branched {uB, _∞ ² } [AlAsO₅]²⁻ layers parallel to the (100) plane. The layers consist of two-link chains of _∞ ¹ [Al₂O₆] tetrahedra, which are parallel to the z-axis and are connected through the [AsO₄]-groups. The sharing-edges [CuO₅] tetragonal pyramids link the aluminoarsenate layers to form a three-dimensional framework. The established layer is the second example of an tetrahedral aluminoarsenate polyanion.

Document Type: Research article

DOI: http://dx.doi.org/10.1134/1.1312909

Affiliations: 1: Email: filatov@mail.ru

Publication date: 2000-09-01