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Synthesis and Structure of the Ternary Vanadate NaMn

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Synthesis and Structure of the Ternary Vanadate NaMn

4

(VO

4

)

3

Hamdi Ben Yahiaa,b, Etienne Gaudinb, Ute Ch. Rodewalda, and Rainer P¨ottgena

aInstitut f¨ur Anorganische und Analytische Chemie, Universit¨at M¨unster, Corrensstraße 30, 48149 M¨unster, Germany

bICMCB, CNRS, Universit´e Bordeaux 1,

87 Avenue du Docteur Schweitzer, 33608 Pessac Cedex, France

Reprint requests to R. P¨ottgen.

E-mail: pottgen@uni-muenster.de Z. Naturforsch.2011,66b,437 – 440;

received February 2, 2011

The vanadate NaMn4(VO4)3 was obtained as dark- brown crystals as a side-product during the crystalliza- tion of the oxygen-deficient perovskite Na3MnV2O7.5in an NaCl/KCl flux. NaMn4(VO4)3crystallizes with the tetrago- nal (Mg1/21/2)Mg4(AsO4)3type, space group I¯42d. The structure was refined from single-crystal diffractometer data:

a= 7.0238(2),c= 19.8360(9) ˚A,R(F)= 0.013,wR(F2) = 0.033, 853F2values, and 49 variables. The NaMn4(VO4)3

structure is built up of different sheets stacked perpendicular to thecaxis. Na, Mn and V atoms are located in dodecahe- dra, octahedra and tetrahedra, respectively.

Key words:Vanadates, Crystal Structure, MnO-V2O5-Na2O Ternary System

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