Synthesis, crystal structure, sintering and electrical properties of a new alluaudite-like triple molybdate K_0.13Na_3.87MgMo₃O₁₂

Abstract

A new triple molybdate K0.13Na3.87MgMo3O12 was synthesized by solid state reaction.

Synthesis, Structure, and Conductivity of Alluaudite‐Related Phases in the Na2MoO4–Cs2MoO4–CoMoO4 System

“…Our new data on the Na 3.21 Cs 0.37 Co 1.21 (MoO 4 ) 3 structure confirms predominance of the X (2) site for large cations, which increase their CN up to 8 instead of 4 + 4. In addition, presence of cation vacancies in the X (2) site of the Na 3.21 Cs 0.37 Co 1.21 (MoO 4 ) 3 structure gives grounds to revise the formulae for K 0.4 Na 3.6 Co(MoO 4 ) 3 , KNa 5 Mn 3 (MoO 4 ) 6 , and K 0.13 Na 3.87 Mg(MoO 4 ) 3 where the X (2) sites are completed. More likely, these sites contain vacancies and the latter phases are members of potassium‐containing solid solutions based on the corresponding nonstoichiometric double molybdates of sodium and bivalent metals.…”

“…In many works, [2,3,9,[11][12][13]27] the alluaudite-type structures are considered as very promising for development of new effective fast Na + conductors. Bond valence sum (BVS) [3a, 9,12,27a,28] maps are known as a simple and effective approach to trace mobile ion pathways.…”

“…[3c] The crystal chemistry and compositions of the alluaudite-type molybdates and tungstates was considered by us in. [3a] The ionic conductivity of Na 2.2 Zn 0.9 (MoO 4 ) 2 [11] and K 0.13 Na 3.87 Mg(MoO 4 ) 3 [9] reaches 2.34 10 -3 S cm -1 at 500°C and 3.8 10 -2 S cm -1 at 580°C, respectively. We also found that the This work continues our research and deals with phase formation, synthesis, crystal structures and ionic conductivity of alluaudite-related phases in the system Na 2 MoO 4 -Cs 2 MoO 4 -Co-MoO 4 .…”

Crystal structure of disilver(I) dizinc(II) iron(III) tris(orthovanadate) with an alluaudite-type structure

“…Over the last twenty years, many synthetic alluaudite-type phosphates, arsenates, sulfates and molybdates have been reported, such as NaMnFe 2 (PO 4 ) 3 used as the positive electrode in sodium and lithium batteries (Trad et al, 2010;Kim et al, 2014;Huang et al, 2015), Na 2.44 Mn 1.79 (SO 4 ) 3 used as a potential high-voltage cathode material (ca 4.4 V) for sodium batteries (Dwibedi et al, 2015), K 0.13 Na 3.87 Mg(MoO 4 ) 3 as a promising compound for developing new materials with high ionic conductivity (Ennajeh et al, 2015), or NaZn 3 (AsO 4 )-(AsO 3 OH) 2 (Ðordević et al, 2015).…”

Synthèse, étude et validation structurale d'un triple bis-molybdate en couches, Ag0.60Na0.40Fe(MoO4)2lié à yavapaiite

“…Plusieurs nouvelles phases ont é té é laboré es dans lesquelles les cavité s octaé driques sont occupé es seulement par des ions bi-ou trivalents (Mg, Mn, Fe, Co, etc.) notamment: -Li 0.37 Na 0.63 -Fe(MoO 4 ) 2 de type wolframite (Souilem et al, 2014), (Na 0.4 Li 0.6 )(Fe,Li 2 )(MoO 4 ) 3 de type lyonsite (Souilem et al, 2015), KNa 5 Mn 3 (MoO 4 ) 6 (Bouzidi et al, 2015) (Ennajeh et al, 2015) de type alluaudite. Dans ce cadre un nouveau maté riau de formulation Ag 0.6 Na 0.4 Fe(MoO 4 ) 2 à charpente bidimensionnelle a é té é laboré par ré action à l'é tat solide à 1173 K. Il s'avè re appartenant à la famille yavapaiite et est isostructural au composé ISSN 2056-9890 NaFe(MoO 4 ) 2 (Klevtsova, 1975) ayant comme paramè tres de maille, a = 9.87, b = 5.31, c = 13.57 Å , =90.4 et groupe d'espace C2/c.…”