Structure of potassium arsenate K5As3O10
Abstract
<h2>Acta Crystallographica Section B</h2><h3>Structural Crystallography and Crystal Chemistry</h3><h3>0567-7408</h3> <h2>short structural papers</h2> Volume 36 Part 7 Pages 1634-1636 July 1980 <h2>Structure of potassium arsenate K 5 As 3 O 10 </h2> J. Hornstra and H. Verweij Acta Cryst. (1980). B36, 1634-1636 Structure of Potassium Arsenate KsAs30~o BY J. HORNSTRA AND H. VERWEIJ Philips Research Laboratories, Eindhoven, The Netherlands (Received 25 September 1979; accepted 25 February 1980) Abstract. KsAs30~o, orthorhombic, P2~2~2a, a = 7.98 (1), b = 7.97 (1), c = 19-30(2)/k, V= 1227.5 A3, Z ---- 4, Dm = 3-06, Dc = 3-14 Mg m-3, /t(Mo Ka, 2 = 0.7107 /k) = 10.5 mm-~. The structure was solved by Patterson methods from X-ray single-crystal data. For 912 independent intensity data the final R = 0.04. Each As atom is tetrahedrally surrounded by four O atoms. Groups of three corner-sharing tetra- hedra form strongly bent chains. The coordination number of the K atoms varies from six to nine. Tetrag- onal pseudosymmetry may lead to twinning. Introduction. Structural data on potassium arsenates are needed for a study on As-containing silicate glasses (Verweij, 1979). Condensed alkali arsenates generally contain chains or rings of corner-sharing AsO4 tetra- hedra. (LiAsO3)x (von Hilmer & Dornberger-Schiff,