The crystal structure and ionic conductivity of a novel indium and sodium phosphate Na7(InP2O7)4PO4

Na7Cr4(P2O7)4PO4

“…For isotopic compounds, see: Stus et al (2001); Zhao (2011). For background to physico-chemical properties of related compouds, see: Sljukic et al (1967); Hagman & Kierkegaard (1968); Goodenough et al (1976); Sanz et al (1999); De la Rochè re et al (1985).…”

“…Une autre fammille de composés Na 7 M 4 (P 2 O 7 ) 4 PO 4 avec (M = Fe, Al, Cr) fût aussi découverte par De la Rochère et al (1985), leurs propriétés d′échange ionique et de conductivité ont été étudiées. Dans cette série les composés Na 7 In 4 (P 2 O 7 ) 4 PO 4 et Na 7 Al 4 (P 2 O 7 ) 4 PO 4 ont été synthétisés et étudiés respectivement par Stus et al (2001) (2) Å. La géométrie des groupements P 2 O 7 est conforme à celle observée dans de nombreux autres diphosphates (Wang & Hwu, 1991;Kouass et al, 2010).…”

Heptasodium tetraaluminium tetrakis(diphosphate) orthophosphate, Na7Al4(P2O7)4(PO4)

“…Metal phosphates possessing open-framework structures with defined tunnels have been extensively investigated for their structural diversity, properties, and potential applications in shape-selective catalysis, adsorbents, ion exchangers, and molecular sieves. Among them, a series of isotypic ortho-diphosphates Na 7 (MP 2 O 7 ) 4 PO 4 (M = Al, Cr, Fe) (Rochère et al, 1985) and Na 7 (InP 2 O 7 ) 4 PO 4 (Stus et al, 2001) were synthesized, and their ion exchange and conductivity properties studied. However, for compound Na 7 (AlP 2 O 7 ) 4 PO 4 , a detailed crystal structure analysis has not been reported so far.…”

26 Conducting solids

“…Research on Na ϩ ion conductors has been rather light this year. 119 Single crystals were prepared by a flux method, and the conductivity was shown to be highly anisotropic (8.33 × 10 Ϫ4 S cm Ϫ1 and 5.5 × 10 Ϫ7 S cm Ϫ1 at 300 ЊC). The conductivity for these phases containing In is much larger than that for analogous phases containing Al, Cr, or Fe.…”