New series of triple molybdates AgA3R(MoO4)5 (A=Mg, R=Cr, Fe; A=Mn, R=Al, Cr, Fe, Sc, In) with framework structures and mobile silver ion sublattices

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

“…The Smith–Snyder figure-of-merit (Smith and Snyder, 1979) is F 30 = 221.8 (0.0033, 41). The crystal structure was refined according to the Rietveld method (Rietveld, 1969), starting with the atomic coordinates of AgMg 3 Fe(MoO 4 ) 5 structure (Kotova et al , 2016). The compound obtained was found to crystallize in the NaMg 3 In(MoO 4 ) 5 structure (Klevtsova et al , 1993).…”

“…It should be noted that these structural organizations are implemented in the systems where 2- and 3-charged cations have potential octahedral coordination and the trivalent metals with r ( R 3+ ) < 1 Å. The phases obtained were found to have a high ionic conductivity (Kozhevnikova and Mokhosoev, 2000; Kotova et al , 2011, 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).…”

“…It was noted that the deviation of the composition from the stoichiometric was observed for Ag 0.90 Al 1.06 Co 2.94 (MoO 4 ) 5 , which can be caused by essentially higher crystallization temperature of this phase compared with our conditions. The formation of AgMn II 3 (Mn III 0.26 Al 0.74 )(MoO 4 ) 5 can also be explained by relatively extreme crystallization conditions with oxidation of Mn(II) to Mn(III) in the melt (Kotova et al , 2016).…”

New triple molybdate Rb2AgIn(MoO4)3: synthesis, framework crystal structure and ion-transport behaviour

“…Analogous silver-containing NASICON-type Ag 1-x A 1-x R 1+x -(MoO 4 ) 3 and AgA 3 R(MoO 4 ) 5 with the NaMg 3 In(MoO 4 ) 5 structure type were found in the systems Ag 2 MoO 4 -AMoO 4 -R 2 (MoO 4 ) 3 (AR = MgAl, CoAl or MgIn) (Kotova et al, 2016). The NASICON-type Ag 1-x A 1-x R 1+x (MoO 4 ) 3 demonstrate high ionic conductivity (Kotova et al, 2011), which is characteristic for this structural family.…”