Structural properties of the alluaudite-type materials Ag<sub>2–</sub><i><sub>x</sub>Na<sub>x</sub></i>Mn<sub>3</sub>(VO<sub>4</sub>)<sub>3</sub> (<i>x</i>=0.62 and 1.85)
<p dir="ltr">The new members of the Ag<sub>2−</sub><sub>x</sub>Na<sub>x</sub>Mn<sub>3</sub>(VO<sub>4</sub>)<sub>3</sub> (0 ≤ x ≤ 2) solid solution were synthesized by a solid-state reaction route. The crystal str...
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2019
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| Summary: | <p dir="ltr">The new members of the Ag<sub>2−</sub><sub>x</sub>Na<sub>x</sub>Mn<sub>3</sub>(VO<sub>4</sub>)<sub>3</sub> (0 ≤ x ≤ 2) solid solution were synthesized by a solid-state reaction route. The crystal structures of Ag<sub>1.38</sub>Na<sub>0.62</sub>Mn<sub>3</sub>(VO<sub>4</sub>)<sub>3</sub> (x = 0.62) and Ag<sub>0.15</sub>Na<sub>1.85</sub>Mn<sub>3</sub>(VO<sub>4</sub>)<sub>3</sub> (x = 1.85) were solved using single crystal X-ray diffraction. These phases crystallize with a monoclinic symmetry (space group C2/c), and their structures are new members of the well-known alluaudite family. In both compounds, the Ag<sup>+</sup>/Na<sup>+</sup>, Mn<sup>2+</sup>/Mn<sup>3+</sup> and V<sup>5+</sup> cations are eight-, six-, and four-coordinated to oxygen atoms, respectively. All the atoms are perfectly ordered except for the Ag and Na atoms which are statistically disordered over a 4b and a 4e atomic position. This single-crystal structural study confirms the existence of a full solid solution Ag<sub>2−</sub><sub>x</sub>Na<sub>x</sub>Mn<sub>3</sub>(VO<sub>4</sub>)<sub>3</sub> (0 ≤ x ≤ 1.85).</p><h2>Other information</h2><p dir="ltr">Published in: Zeitschrift für Naturforschung B<br>License: <a href="http://creativecommons.org/licenses/by/4.0" target="_blank">http://creativecommons.org/licenses/by/4.0</a><br>See article on publisher's website: <a href="http://dx.doi.org/10.1515/znb-2019-0116" target="_blank">http://dx.doi.org/10.1515/znb-2019-0116</a></p> |
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