Crystal structure of a silver-, cobalt- and iron-based phosphate with an alluaudite-like structure: Ag_1.655Co_1.64Fe_1.36(PO₄)₃

Abstract

The transition metal orthophosphate Ag1.655Co1.64Fe1.36(PO4)3 crystallizes in an alluaudite-type structure. The chains characterizing the alluaudite structure are built up from edge-sharing [CoO6] and [FeO6] octa­hedra linked together by PO4 tetra­hedra. The Ag+ cations are located in two types of channels in the resulting framework.

Synthesis, crystal structure determination of a novel phosphate Ag1.64Zn1.64Fe1.36(PO4)3 with an alluaudite-like structure

“…The observed deviation of the chemical formulation from the stoichiometric composition is often encountered in phosphate materials of the alluaudite type viz. Na 1.50 Mn 2.48 Al 0.85 (PO 4 ) 3 (Hatert, 2006), Na 1.25 Mg 1.10 Fe 1.90 -(PO 4 ) 3 (Hidouri et al, 2008), NaFe 3.67 (PO 4 ) 3 (Korzenski et al, 1998), Na 1.79 Mg 1.79 Fe 1.21 (PO 4 ) 3 (Hidouri et al, 2003), Na 0.38 Ca 0.31 MgFe 2 (PO 4 ) 3 (Zid et al, 2005), -Na 0.67 FePO 4 (Kim et al, 2013), Li 0.5 Na 0.5 MnFe 2 (PO 4 ) 3 (Trad et al, 2010), Na 1.5 Mn 1.5 Fe 1.5 (PO 4 ) 3 (Hatert, 2004), Na 1.86 Fe 3 (PO 4 ) 3 (Essehli et al, 2016) (Bouraima et al, 2017). Generally, in this structure the interconnected sheets produce two types of hexagonal channels parallel to the c-axis direction (Hatert, 2008): channel (1) at ( 1 2 , 0, z) and (0, 1 2 , z), while channel (2) is located at (0, 0, z) and ( 1 2 , 1 2 , z) (Leroux et al, 1995).…”

Na1.85Mg1.85In1.15(PO4)3 and Ag1.69Mg1.69In1.31(PO4)3 with alluaudite-type structures

“…1. of the cationic disorder at the octahedral sites, as observed for example in Cu 1.35 Fe 3 (PO 4 ) 3 (Warner et al, 1993) (Hidouri & Ben Amara, 2011), NaFe 3.67 (PO 4 ) 3 (Korzenski et al, 1998), Na 1.25 Mg 1.10 Fe 1.90 -(PO 4 ) 3 (Hidouri et al, 2008), Na 1.50 Mn 2.48 Al 0.85 (PO 4 ) 3 (Hatert, 2006), Na 1.79 Mg 1.79 Fe 1.21 (PO 4 ) 3 (Hidouri et al, 2003), Na 1.67 Zn 1.67 Fe 1.33 (PO 4 ) 3 (Khmiyas et al, 2015) or Ag 1.655 Co 1.647 Fe 1.352 (PO 4 ) 3 (Bouraima et al, 2017).…”

A novel stibium phosphate, LiBa(SbO)2(PO4)3: synthesis, crystal structure and RE3+-activated (RE = Tb3+ and Eu3+) fluorescence performance

“…Phosphates have attracted much attention in recent years because of their potential applications as catalysts, electrode materials, optical components and ionic conductors (Zhao et al, 2009). The basic building block of phosphates is the flexible PO 4 group that can adapt various coordination environments by altering the P-O bond lengths (Bouraima et al, 2017). The PO 4 group can also be interlinked by cornersharing vertex O atoms into various polyphosphate groups, including P 2 O 7 , P 3 O 9 , P 3 O 10 , P 4 O 15 , P 6 O 18 , and so on (Issaoui et al, 2016;Edhokkar et al, 2012;Hong et al, 2011).…”