Crystal structure and magnetic properties of Pb2Ni(PO4)2

Abstract

A new NiO-based material Pb2Ni(PO4)2 was obtained by a conventional solid-state reaction in air. The crystal structure exhibits both corner- and edge-sharing {Ni-O-P} bonds in the system. Magnetic properties were investigated by means of magnetic susceptibility, magnetization, and heat capacity measurements. The results show a typical three-dimensional antiferromagnetic ordering below ~4 K and a field-induced spin-flop transition below the Néel temperature.

Syntheses, Crystal Structures and Luminescent Properties of Two New Heterometallic Phosphates: Sn2Ge(PO4)2(OH)2 and Sn2Mn(PO4)2

“…The P–O bond lengths vary from 1.526(3) to 1.546(3) Å and the O–P–O bond angles are in the range of 106.51(19)°–112.4(2)°. All these bond lengths and bond angles values are comparable to the previous reported compounds . In addition, BVSs calculation for Sn(1), Mn(1), and P(1) are 1.69, 1.97, and 4.77, respectively (Table S2), indicating the formal oxidation states of +2 for Sn, +4 for Mn and +5 for P atoms …”

“…The strong absorption bands at 1040, 982 and 1005 cm −1 for both compounds are attributed to the stretching vibrations in the PO 4 groups. The bands at 662/604 cm −1 and 573/542 cm −1 might be ascribed to the bending vibrations of the O−P−O bonds of PO 4 groups …”

Synthesis and magnetic properties of spin-$\frac{3}{2}$ $γ$-phase of SrCo$_{2}$(PO$_{4}$)$_{2}$ antiferromagnet

“…The two Gaussian peaks corresponding to two different P sites, were also observed in Pb 2 Ni(PO 4 ) 2 compound. 56 This is quite a surprising aspect considering the SrNi 2 (PO 4 ) 2 compound within this AM 2 (PO 4 ) 2 family where despite having two crystallographic phosphorus sites two different 31 P NMR signals were not observed. 34 It is important to point in this regard that the amount of shift observed in γ-SrCo 2 (PO 4 ) 2 is much larger compared to SrNi 2 (PO 4 ) 2 , the nearest compound in the AM 2 (PO 4 ) 2 family; 34 which indicates that there might be stronger hyperfine coupling in γ-SrCo 2 (PO 4 ) 2 compared to the other members in the AM 2 (PO 4 ) 2 family, 34,56,58 which causes the larger shift and also results in the splitting of the 31 P NMR signal from the two structurally different phosphorus.…”

Syntheses, crystal structures and optical properties of two one-dimensional germanophosphates: HRb3Ge2(HPO4)6 and CsGe(HPO4)2(OH)

“…The strong absorption bands at 1140/1149 and 1000/1027 cm À1 for both compounds are attributed to stretching vibrations in the HPO 4 groups. The absorption bands at low-frequency regions, such as 663/646 and 575/531 cm À1 for 1 and 2, respectively, are mainly ascribed to the vibrational modes of the HPO 4 and GeO 6 groups (Huang et al, 2015;Chang et al, 2017;He et al, 2013;Zhao et al, 2018). Specifically, the presence of the -OH group is confirmed by the observation of characteristic peaks at low-frequency regions, such as 3469, 2814 and 2470 cm À1 , for the asymmetric O-H stretching and at $1769 cm À1 for the H-O-H bending mode of compound 2 (Yang et al, 2007;Liu et al, 2009;Han et al, 2016;Li et al, 2017).…”