Title of article :
Crystal structure of dicaesium strontium hexacyanidoferrate(II), Cs2Sr[Fe(CN)6], from laboratory X-ray powder data
Author/Authors :
Massoni, Nicolas CEA, DES, ISEC, DE2D - Univ Montpellier, Marcoule, France , Moloney, Mícheál P. CEA, DES, ISEC, DE2D - Univ Montpellier, Marcoule, France , Grandjeana, Agnès CEA, DES, ISEC, DE2D - Univ Montpellier, Marcoule, France , Misture, Scott T. Kazuo Inamori School of Engineering - Alfred University, USA , zur Loye, Hans-Conrad Center for Hierarchical Waste Form Materials, USA
Abstract :
Ferrocyanides with general formula AIxBIIy[Fe(CN)6], where A and B are cations, are thought to accept many substitutions on the A and B positions. In this communication, the synthesis and crystal structure of Cs2Sr[Fe(CN)6] are reported. The latter was obtained from K2Ba[Fe(CN)6] particles, put in contact with caesium and strontium ions. Hence, a simultaneous ion-exchange mechanism (Cs for K, Sr for Ba) occurs to yield Cs2Sr[Fe(CN)6]. The synthesis protocol shows that K2BaFe(CN)6 particles can be used for the simultaneous trapping of radioactive caesium and strontium nuclides in water streams. Cs2Sr[Fe(CN)6] adopts the cryolite structure type and is isotypic with the known compound Cs2Na[Mn(CN)6] [dicaesium sodium hexacyanidomanganate(III)]. The octahedrally coordinated Sr and Fe sites both are located on inversion centres, and the eightfold-coordinated Cs site on a general position.
Keywords :
crystal structure , X-ray powder diffraction , caesium strontium hexaferrocyanate , cryolite-type structure
