Synthèse et structure cristalline d'un matériau noir AgMn^II₃(Mn^III_0,26Al_0,74)(MoO₄)₅

Abstract

A new silver aluminium trimangan­ese penta­molybdate, AgMnII 3(MnIII 0,26Al0,74)(MoO4)5, is composed of M 2O10 dimers, M 3O14 (M = Mn, Al) trimers and MoO4 tetra­hedra sharing corners and forming three types of layers. A comparative structural description is provided with the structures of related phases containing dimers, trimers and tetra­mers.

Crystal structure of new triple molybdate AgMg3Ga(MoO4)5 from Rietveld refinement

“…Cations Mg 2+ and Ga 3+ are statistically distributed on octahedral M 1– M 4 positions with the (Mg, Ga)–O bond lengths of 2.050–2.085 Å. Cations Ag1 and Ag3 are coordinated by four O atoms (Ag1–O 2.363, Ag3–O 2.500 Å), while cation Ag2 has CN = 5 (Ag2–O 2.515 Å). Analogous coordinations and disordering of Ag + and Na + ions were also found in AgMg 3 R (MoO 4 ) 5 ( R = Cr, Fe) (Kotova et al , 2016), AgMn II 3 (Mn III 0.26 Al 0.74 )(MoO 4 ) 5 (Bouzidi et al , 2015), Ag 0.90 Al 1.06 Co 2.94 (MoO 4 ) 5 (Nasri et al , 2015), and NaMg 3 In(MoO 4 ) 5 (Klevtsova et al , 1993). In the framework organization of AgMg 3 Ga(MoO 4 ) 5 there are three sorts of the adjacent layers along the c -axis, A , B , and C (Figure 2), as well as layers inverted relative to initial layers A and B .…”

“…In these cavities, the silver cations are disordered on three close positions with the distances Ag−Ag 0.879(2) and 1.127(19) Å. Such a disordering is also typical for other compounds of this isostructural series (Klevtsova et al , 1993; Hermanowicz et al , 2006; Bouzidi et al , 2015; Nasri et al , 2015; Kotova et al , 2016).…”

“…Earlier we synthesized and characterized silver-containing triple molybdates Ag A 3 R (MoO 4 ) 5 ( A = Mg, R = Cr, Fe; A = Mn, R = Al, Cr, Fe, Sc, In) (Kotova et al , 2016). The single crystals of AgMg 3 R (MoO 4 ) 5 ( R = Cr, Fe), AgMn II 3 (Mn III 0.26 Al 0.74 )(MoO 4 ) 5 , Ag 0.90 Al 1.06 Co 2.94 (MoO 4 ) 5 , and AgFe II 3 Fe III (MoO 4 ) 5 were obtained and their crystal structures were determined (Balsanova, 2015; Bouzidi et al , 2015; Nasri et al , 2015; Kotova et al , 2016).…”

Synthesis, crystal structure and electrophysical properties of triple molybdates containing silver, gallium and divalent metals

“…Crystal structure of AgZn 3 Ga(MoO 4 ) 5 T h e c r y s t a l s t r u c t u r e of AgZn 3 Ga(MoO 4 ) 5 was refined ac-cording to the Rietveld method [21], starting with the atomic coordinates of AgMg 3 Fe(MoO 4 ) 5 structure [7]. Crystal data, data collection and structure refinement details are summarized in Table 3.…”

“…In particular, silver-containing NASICON-like phases Ag 1-x A 1-x R 1+x (MoO 4 ) 3 (A = Mg Co, R = Al; A = Mg, R = In) with different homogeneity range and triclinic AgA 3 R(MoO 4 ) 5 (A = Mg, R = Cr, Fe, Ga; A = Mn, R = Al, Cr, Fe, Sc, In) having high ionic conductivity (10 -3 -10 -2 S / cm) are of interest. For a number of phases: AgMg 3 R(MoO 4 ) 5 (R = Cr, Fe), AgMn II 3 (Mn III 0.26 Al 0.74 ) (MoO 4 ) 5 , Ag 0.90 Al 1.06 Co 2.94 (MoO 4 ) 5 and AgFe II 3 Fe III (MoO 4 ) 5 single crystals were obtained and their crystal structures were determined [1][2][3][4][5][6][7][8][9]. The purpose of this work is to study the possibility of forming triple molybdates Ag 1-x A 1-x Ga 1+x (MoO 4 ) 3 and AgA 3 Ga(MoO 4 ) (A = Mn, Co, Zn, Ni) and investigate crystal structure and electrophysical properties of the obtained compounds.…”