AAg₂(M′_1/3M_2/3)[VO₄]₂: Synthesis, Magnetic Properties, and Lattice Dynamics of Honeycomb-Type Lattices

Abstract

The magnetic honeycomb lattice series of compounds, AAg2(M'1/3M2/3)[VO4]2 with A = Ba(2+), Sr(2+), M' = Mg(2+), Zn(2+), and M = Mn(2+), Co(2+), and Ni(2+), have been synthesized and their physical properties are reported. This series of compounds contains the M' and M cations in a 1:2 ratio on a single crystallographic site. In an ordered arrangement, this could generate a magnetic honeycomb-type lattice. Presented X-ray diffraction data, spectroscopic measurements of lattice dynamics, along with ab initio calculations, magnetic, and specific heat data for these compounds clearly point toward the formation of magnetic honeycomb-type lattices.

Structural and magnetic characterization of the one-dimensionalS=5/2antiferromagnetic chain systemSrMn(VO4Sanjeewa1, Garlea2, McGuire3 et al. 2016Phys. Rev. B35090View full textAdd to dashboardCite

“…Our Raman spectra display similar peaks at 831 783 and cm -1 . The shape and intensity of the peaks is very similar to the peaks observed for BaAg 2 Mn(VO 4 ) 2 , which were assigned as Ag, Ag and Eg stretches respectively [35]. These workers also observed a signficant sensitivity of the frequencies to the nature of the other metal ions in the structure.…”

“…The shape and intensity of the peaks is very similar to the peaks observed for BaAg 2 Mn(VO 4 ) 2 , which were assigned as Ag, Ag and Eg stretches respectively. [35] These workers also observed a signficant sensitivity of the frequencies to the nature of the other metal ions in the structure. Peaks at 446 and 338 cm -1 can be assigned to the ν 1 and ν 3 bending modes of the [VO 4 ] respectively, as in natural descloizite (Figure 2b inset).…”

Synthesis and characterization of new fluoride-containing manganese vanadates A2Mn2V2O7F2 (A=Rb, Cs) and Mn2VO4F

“…2H 2 O containing a coordinated pyrovanadate[48]. Previous work demonstrated a significant dependence of vanadate vibrational frequencies on the nature of the transition metal ion as well as the alkaline earth ions [49]. These factors plus the additional complexity of the pyrovanadate groups can introduce some ambiguity in the vibrational band assignments.…”

Reactivity and Structural Defects in Glaserite‐Type Iron‐Vanadates

“…In recent years the 3d‐transition metal compounds have triggered interest as these present examples for magnetic triangular lattices with ferromagnetic, antiferromagnetic, or spin‐liquid like ground states. From substitution variants on the M site by diamagnetic ions or defect vacancies, ratio M :( M ′ or □) = 2:1, honeycomb lattices may be obtained , . However, the ordered, undistorted and planar honeycomb or kagome lattice for fundamental studies of low‐dimensional magnetic materials remains a chemical challenge , …”

“…From substitution variants on the M site by diamagnetic ions or defect vacancies, ratio M:(MЈ or ᮀ) = 2:1, honeycomb lattices may be obtained. [18,19] However, the ordered, undistorted and planar honeycomb or kagome lattice for fundamental studies of lowdimensional magnetic materials remains a chemical challenge. [20,21] AB 2 M[VO 4 ] 2 .…”