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Eu3(AsS4)2 and AxEu3-yAs5-zS10 (A = Li, Na):  Compounds with Simple and Complex Thioarsenate Building Blocks

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posted on 15.10.2007 by Tarun K. Bera, Ratnasabapathy G. Iyer, Christos D. Malliakas, Mercouri G. Kanatzidis
Eu3(AsS4)2 and AxEu3-yAs5-zS10 (A = Li, Na) are the members of a new thioarsenate family. They feature As5+ and As3+ centers, respectively. The rhombohedral Eu3(AsS4)2 features a new structure type consisting of eight-coordinate Eu2+ centers and AsS43- anions, whereas the monoclinic AxEu3-yAs5-zS10 (Li0.73Eu3As4.43S10 and Na0.66Eu2.86As4.54S10) belong to the rathite sulfosalt family and are comprised of apparent [As10S20]10- segments linked with Eu2+ ions to give a three-dimensional network. They appear to be alkali-metal-stabilized derivatives of the putative parent phase “Eu3As5S10”.

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