Crystal structure of disodium dicobalt(II) iron(III) tris(orthophosphate) with an alluaudite-like structure

Abstract

The transition metal orthophosphates Na2 M 2Fe(PO4)3 (M = Co, Ni) crystallize in an alluaudite-type structure. The chains characterizing the alluaudite structure are then built up from [M 2O10] units alternating with [FeO6] octa­hedra.

Crystal structure of a sodium, zinc and iron(III)-based non-stoichiometric phosphate with an alluaudite-like structure: Na1.67Zn1.67Fe1.33(PO4)3

“…Nevertheless, the presence of alkali metals in the tunnels of synthetic alluaudite phases is frequently accompanied by cationic distributions that lead to non-stoichiometric compositions, such as: (Na 0.38 ,Ca 0.31 )MgFe 2 (PO 4 ) 3 (Zid et al, 2005); NaFe 3.67 (PO 4 ) 3 (Korzenski et al, 1998); Cu 1.35 Fe 3 (PO 4 ) 3 (Warner et al, 1993 (Hermann et al, 2002). As part of our study on alluaudite-related phosphates (Bouraima et al, 2015;Assani et al, 2011), we report the synthesis and the crystal structure of a new sodium, zinc and iron-based non-stoichiometric phosphate, namely Na 1.67 Zn 1.67 Fe 1.33 (PO 4 ) 3 .…”

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

“…The hydrothermal study of the pseudo-ternary system Na 2 O-MgO-P 2 O 5 allowed the isolation of the alluaudite based on sodium and magnesium: NaMg 3 (PO 4 )(HPO 4 ) 2 (Ould Saleck et al, 2015). Similarly, the investigation of the two pseudo-quaternary systems Na 2 O-CoO-Fe 2 O 3 -P 2 O 5 and Na 2 O-ZnO-Fe 2 O 3 -P 2 O 5 , made it possible to obtain two new phases: Na 2 Co 2 Fe(PO 4 ) 3 (Bouraima et al, 2015) and Na 1.67 Zn 1.67 Fe 1.33 (PO 4 ) 3 (Khmiyas et al, 2015), by a solid-state route. Herein we report the synthesis of the new phosphate Ag 1.64 Zn 1.64 Fe 1.36 (PO 4 ) 3 and its structural characterization by single crystal X-ray diffraction.…”

Crystal structure of strontium dinickel iron orthophosphate

“…Phosphates with the alluaudite (Moore, 1971) and -CrPO 4 (Attfield et al, 1988) crystal structures have attracted great interest due to their potential applications as battery electrodes (Trad et al, 2010;Kim et al, 2014;Huang et al, 2015). In the last decade, our interest has focused on those two phosphate derivatives and we have succeeded in synthesizing and structurally characterizing new phosphates such as Na 2 Co 2-Fe(PO 4 ) 3 (Bouraima et al, 2015) and Na 1.67 Zn 1.67 Fe 1.33 (PO 4 ) 3 (Khmiyas et al, 2015) with the alluaudite structure type, and MMn II 2 Mn III (PO 4 ) 3 (M = Pb, Sr, Ba) (Alhakmi et al (2013a,b;Assani et al, 2013) which belongs to the -CrPO 4 structure type. In the same context, our solid-state chemistry investigations within the ternary system MO-M 0 O-NiO-P 2 O 5 (M and M 0 are divalent cations), have led to the synthesis of the title compound SrNi 2 Fe(PO 4 ) 3 which has a related -CrPO 4 structure.…”