Structural investigation of the alluaudite-like mixed-valence iron phosphate: Na1.25Mg1.10Fe1.90(PO4)3

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).…”

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).…”

K0.53Mn2.37Fe1.24(PO4)3

“…For the alluaudite structure, see: Fisher (1955); Moore (1971); Chouaibi et al (2001); Corbin et al (1986); Lee & Ye (1997); Hidouri et al (2003Hidouri et al ( , 2004Hidouri et al ( , 2008 Antenucci et al (1993Antenucci et al ( , 1995; For P-O distances, see: Baur (1974). For bond-valence sums, see: Brown & Altermatt (1985).…”