Crystal structures and magnetic properties of iron (III)-based phosphates: Na4NiFe(PO4)3 and Na2Ni2Fe(PO4)3

Topological Features of the Alluaudite-Type Framework and Its Derivatives: Synthesis and Crystal Structure of NaMnNi2(H2/3PO4)3

“…The main characteristic feature of 1 is the absence of any cations or H 2 O molecules in the channel II [A(2) = ] with the negative charge of the framework balanced by the partial protonation of PO 4 tetrahedra (Table 3). The compound Na 2 FeNi 2 (PO 4 ) 3 reported in Reference [29] belongs to the same family, but differs from 1 by the presence of Na in both types of channels (<Na (A1 ) -O> = 2.625 Å, <Na (A2) -O> = 2.525 Å) and by the absence of hydroxyl groups. The M1O 6 -and M2O 6 -octahedra of the heteropolyhedral framework in the compound Na 2 FeNi 2 (PO 4 ) 3 are occupied by Fe 3+ and Ni atoms, respectively, with the following mean <M-O> distances: <M1-O> = 2.137 Å, <M2-O> = 2.043 Å [29].…”

“…The main characteristic feature of 1 is the absence of any cations or H2O molecules in the channel II [A(2) = □] with the negative charge of the framework balanced by the partial protonation of PO4 tetrahedra (Table 3). The compound Na2FeNi2(PO4)3 reported in Reference [29] belongs to the same family, but differs from 1 by the presence of Na in both types of channels (<Na (A1') -O> = 2.625 Å , <Na (A2) -O> = 2.525 Å ) and by the absence of hydroxyl groups. The M1O6-and M2O6-octahedra of the heteropolyhedral framework in the compound Na2FeNi2(PO4)3 are occupied by Fe 3+ and Ni atoms, respectively, with the following mean <M-O> distances: <M1-O> = 2.137 Å , <M2-O> = 2.043 Å [29].…”

“…Because of the wide isomorphism in the cationic and anionic parts of the alluaudite-type structures, they attract interest as advanced materials for Li-ion batteries [22][23][24][25][26][27][28]. Despite the observed chemical diversity, Ni-containing alluaudite-type compounds are represented only by anhydrous phosphates Na 2 MNi 2 (PO 4 ) 3 (M = Fe, Al) [29,30] and CaFeNi 2 (PO 4 ) 3 [31], mixed phosphate-hydrogen phosphate AgNi 3 (PO 4 )(HPO 4 ) 2 [32], sulfate Na 2 Ni 2 (SO 4 ) 3 [33,34], and mixed sulfate-selenate Na 3 Ni 1.5 (SO 4 ) 3-1.5x (SeO 4 ) 1.5x [35].…”

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

“…A new alluaudite ISSN 2056-9890 structure of formula Na 2 Co 2 Fe(PO 4 ) 3 was synthesized by solid-state reaction. During our investigation of these systems, we characterized the following compounds: AgMg 3 (PO 4 )-(HPO 4 ) 2 (Assani et al, 2011a), Ag 2 Ni 3 (HPO 4 )(PO 4 ) 2 (Assani et al, 2011b) and Na 2 Ni 2 Fe(PO 4 ) 3 (Essehli et al, 2011). The present paper reports the solid-state synthesis and characterization of a new transition-metal phosphate, namely, Na 2 Co 2 Fe(PO 4 ) 3 .…”

H{[Na(H2O)3]6F}(PO4)2 ⋅ 2(H2O): A New Polycation‐Type Phosphate with Deep Ultraviolet Transparency

“…[7] In fields of functional materials and catalysis, most inorganic porous materials and molecular sieves are phosphates like SAPO-5, [8] Pb/SAPO-11, [9] and MAPO-5 (M=Mg, Ca, Sr and Ba). [10] Furthermore, for magnetic materials, phosphates containing transition elements (especially Fe, Cu and Mn) and rare earth elements (peculiarly Tb and Gd) are hot research systems and many excellent magnetic compounds, such as Na 4 NiFe(PO 4 ) 3 , [11] K 2 Mn 0.5 Ti 1.5 (PO 4 ) 3 , [12] and K 3 Gd 5 (PO 4 ) 6 , [13] have been found. In addition, studies on nonlinear optical (NLO) materials have shown that phosphates can be excellent ultraviolet and visible NLO materials, while several famous orthophosphates, such as KTiOPO 4 , [14] Ba 3 (ZnB 5 O 10 )PO 4 , [15] and Pb 3 Bi(PO 4 ) 3 , [16] have been found with large SHG response.…”