Investigation of a Structural Phase Transition and Magnetic Structure of Na2BaFe(VO4)2: A Triangular Magnetic Lattice with a Ferromagnetic Ground State

Sanjeewa, Liurukara D.; Garlea, V. Ovidiu; McGuire, Michael A.; Frontzek, Matthias; McMillen, Colin D.; Fulle, Kyle; Kolis, Joseph W.

doi:10.1021/acs.inorgchem.7b02024

Cited by 16 publications

(23 citation statements)

References 42 publications

(60 reference statements)

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“…In addition, the triple twinning of the crystal structure seen in the SCXRD data indicates that Na 2 SrCo(PO 4 ) 2 grows in a higher symmetry and then transforms into monoclinic upon cooling. A structural change from monoclinic to trigonal was already reported for different glaserite-type compounds [31][32][33][34][35].…”

Section: B Structural Phase Transitionsmentioning

confidence: 56%

Deformation of the triangular spin-1/2 lattice in Na$_2$SrCo(PO$_4$)$_2$

Bader,

Langmann,

Gegenwart

et al. 2022

Preprint

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Crystal structure and thermodynamic properties of Na2SrCo(PO4)2, the chemical sibling of the triangular quantum spin-liquid candidate Na2BaCo(PO4)2, are reported. From single crystal x-ray diffraction and high-resolution synchrotron x-ray powder diffraction, the compound was found to crystallize in the monoclinic space group P 21/a at room temperature, in contrast to the trigonal Na2BaCo(PO4)2. Above 650 K, the symmetry of Na2SrCo(PO4)2 changes to C2/m, while around 1025 K a further transformation toward trigonal symmetry is observed. The monoclinic symmetry leads to a small deformation of the CoO6 octahedra beyond the trigonal distortion ubiquitous in this structure type, and results in the stronger g-tensor anisotropy (gz/gxy = 1.6) as well as the increased XXZ anisotropy (Jz/Jxy = 1.7) compared to the Ba-compound, while the average coupling strength, Jav = (2Jxy +Jz)/3 1.3 K, remains unchanged. The Néel temperature increases from 140 mK (Ba) to 600 mK (Sr), and a weak spin canting with the net in-plane moment of 0.066(4)µB/f.u. appears. We show that the ordering temperature of a triangular antiferromagnet is capably controlled by its structural distortions.

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Section: B Structural Phase Transitionsmentioning

confidence: 56%

Deformation of the triangular spin-1/2 lattice in Na$_2$SrCo(PO$_4$)$_2$

Bader,

Langmann,

Gegenwart

et al. 2022

Preprint

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“…The tetrahedral building blocks also contain trigonal symmetry that can lead to geometric frustration. Vanadate oxyanions, (VO 4 ) 3− , are particularly versatile building blocks for complex magnetic structures containing divalent and trivalent transition metals . The presence of empty d‐orbitals in the oxyanion bridging units can also have a significant effect on the value and sign of the coupling constant.…”

Section: Figurementioning

confidence: 99%

“…Vanadate oxyanions, (VO 4 ) 3À ,a re particularly versatile buildingb locks for complex magnetic structures containing divalent andt rivalent transition metals. [14][15][16][17][18] The presence of empty d-orbitals in the oxyanion bridging units can also have as ignificant effect on the value and sign of the coupling constant. With its similar size, tetrahedral structure, and empty dorbitals, the molybdate oxyanion, (MoO 4 ) 2À ,c an be expected to adopt many of the same structural roles as (VO 4 ) 3À .The crystal chemical substitutions of additional constituent elements (e.g.…”

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confidence: 99%

Alkali Transition‐Metal Molybdates: A Stepwise Approach to Geometrically Frustrated Systems

Pellizzeri

McMillen

Kolis

2019

Chemistry A European J

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Materials with triangular arrangements of transition metal ions are of great interestf or their complex magnetism resulting from geometric frustration. This paper describes the stepwise formationo fk agomelattices of open shell transition-metal ions from half-delta chains to delta/sawtooth chains, and finally kagomen ets. The systemsc an be viewed as at estbedf or magnetic studies since av ariety of spin states can be introduced across the same structure type, and progress through increasing levels of structuralc omplexity and dimensionality.T he synthetica nd structural development of this continuumi ss tudied here in well-formed single crystals of A 2 M 3 (MoO 4 ) 3 (OH) 2 (A = K, Rb; M = Mn, Co), CsM 2 (MoO 4 ) 2 (OH) (M = Mn, Fe, Co, Zn), and KM 3 (MoO 4 ) 2 O(OH) (M = Mn).[a] Dr.Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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“…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 , .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, redox reactions should occur. However, intermediates such as ternary oxides resulting from acid‐base principles may prevent the expected oxidation of Fe 2+ to Fe 3+ and simultaneous reduction of V +5 , see BaNa 2 Fe[VO 4 ] 2 , as an unprecedented case. Therefore, we have investigated the reactivity in the presence of B = Ag + and Na + in the Ba B 2 Fe[VO 4 ] 2 series.…”

Section: Introductionmentioning

confidence: 99%

Reactivity and Structural Defects in Glaserite‐Type Iron‐Vanadates

Reuß

Ksenofontov

Tapp

et al. 2018

Zeitschrift anorg allge chemie

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We investigated (a) the redox reaction of FeO and Ag2O in the presence of BaCO3 and V2O5 under inert atmosphere and (b) the oxidation of FeO in air in the presence of BaCO3, Na2CO3, and V2O5. The reaction products are members of the glaserite‐type of compounds: Ba(Ag□)Fe[VO4]2 [a = 5.47397(4) Å, c = 7.1780(1) Å, P3]; BaNa1.63Fe0.79[VO4]2 [a = 9.672(1) Å, b = 5.5860(6) Å, c = 14.1505(4) Å, β = 90.042(9)°, C2/c]; and Ba(Ba,Na)Na[VO4]2 [a = 5.8478(2) Å, c = 7.3835(3) Å, P3m1]. The latter presents an example for a statistical distribution of differently charged ions with differences in ionic radii (Ba2+ and Na+) on the B site of the general formula AB2M[VO4]2. The iron compounds exhibit differences in the defect concentration and localization of voids. For Ba(Ag□)Fe[VO4]2 the Fe3+‐triangular lattice remains intact and the Ag substructure is depleted by 50 % through the redox reaction (a). In contrast, for BaNa1.63Fe0.79[VO4]2 defects occur on both sites (B = Na+ and M = Fe3+) with a total of 0.58 defects per formula unit. Extended 57Fe‐Mössbauer studies on a series of Fe‐glaserite compounds relate structural findings from Rietveld refinements of X‐ray diffraction data with defect concentrations, substitution variants, and charge distributions.

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Investigation of a Structural Phase Transition and Magnetic Structure of Na₂BaFe(VO₄)₂: A Triangular Magnetic Lattice with a Ferromagnetic Ground State

Cited by 16 publications

References 42 publications

Deformation of the triangular spin-1/2 lattice in Na$_2$SrCo(PO$_4$)$_2$

Deformation of the triangular spin-1/2 lattice in Na$_2$SrCo(PO$_4$)$_2$

Alkali Transition‐Metal Molybdates: A Stepwise Approach to Geometrically Frustrated Systems

Reactivity and Structural Defects in Glaserite‐Type Iron‐Vanadates

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