Synthesis and structural characterization of AMV2O8(A = K, Rb, Tl, Cs; M = Nb, Ta) vanadates: a structural comparison of A+M5+V2O8vanadates and A+M5+P2O8phosphates

Paidi, Anil Kumar ; Devi, R. Nandini ; Vidyasagar, Kanamaluru (2015) Synthesis and structural characterization of AMV2O8(A = K, Rb, Tl, Cs; M = Nb, Ta) vanadates: a structural comparison of A+M5+V2O8vanadates and A+M5+P2O8phosphates Dalton Transactions, 44 (39). pp. 17399-17408. ISSN 1477-9226

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Official URL: http://doi.org/10.1039/c5dt02618k

Related URL: http://dx.doi.org/10.1039/c5dt02618k

Abstract

Eight new quaternary vanadates of niobium and tantalum, AMV2O8 (A = K, Rb, Tl, Cs; M = Nb, Ta), have been prepared by solid state reactions and structurally characterized by single crystal and powder X-ray diffraction (XRD) techniques. The two cesium compounds, unlike the known CsSbV2O8 with a layered yavapaiite structure, have a new three-dimensional structure and the other six compounds possess the known KSbV2O8 structure type. The three types of [(MV2O8)−]∞ anionic frameworks of twelve A+M5+V2O8 (A = K, Rb, Tl, Cs; M = Nb, Ta, Sb) vanadates could be conceived to be built by different connectivity patterns of M2V4O18 ribbons, which contain MO6 octahedra and VO4 tetrahedra. A structural comparison of these twelve vanadates and the nineteen A+M5+P2O8 phosphates has been made. The spectroscopic studies of these eight new quaternary vanadates are presented.

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