Structural properties of the alluaudite-type materials Ag2–xNaxMn3(VO4)3 (x=0.62 and 1.85)
Structural properties of the alluaudite-type materials Ag2–xNaxMn3(VO4)3 (x=0.62 and 1.85)
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DOI：
10.1515/znb-2019-0116
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
H. Ben Yahia;M. Shikano
中科院分区：
文献类型：
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作者：
H. Ben Yahia;M. Shikano
采用固相反应法合成了Ag 2 − xNaxMn 3（VO 4）3（0 ≤ x ≤ 2）固溶体新成员。用X射线单晶衍射法测定了Ag1.38Na0.62Mn3（VO 4）3（x = 0.62）和Ag0.15Na1.85Mn3（VO 4）3（x = 1.85）的晶体结构。这些相结晶具有单斜对称性（空间群C2/c），它们的结构是著名的透辉石家族的新成员。在这两种化合物中，Ag+/Na+、Mn 2 +/Mn 3+和V 5+阳离子分别与氧原子八配位、六配位和四配位。除了Ag和Na原子在4 b和4 e原子位置上是统计无序的之外，所有原子都是完全有序的。单晶结构研究证实了Ag 2 − xNaxMn 3（VO 4）3（0 ≤ x ≤ 1.85）的全固溶体的存在。
Abstract The new members of the Ag2−xNaxMn3(VO4)3 (0 ≤ x ≤ 2) solid solution were synthesized by a solid-state reaction route. The crystal structures of Ag1.38Na0.62Mn3(VO4)3 (x = 0.62) and Ag0.15Na1.85Mn3(VO4)3 (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+/Na+, Mn2+/Mn3+ and V5+ 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 Ag2−xNaxMn3(VO4)3 (0 ≤ x ≤ 1.85).