Barium Cobalt Phosphate, BaCo2(PO4)2

Bircsak, Z.; Harrison, William T. A.

doi:10.1107/s010827019800794x

Cited by 29 publications

(16 citation statements)

References 2 publications

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“…• Method 1: We adapted the synthesis method reported in Ref. 29 by adjusting relative proportions of reactants in an effort to produce larger crystals.…”

Section: Appendix A: Sample Synthesismentioning

confidence: 99%

Short-range order in the quantum XXZ honeycomb lattice material BaCo2(PO4)2

et al. 2018

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We present observations of highly frustrated quasi two-dimensional (2D) magnetic correlations in the honeycomb lattice layers of the Seff= 1/2 compound γ-BaCo2(PO4)2 (γ-BCPO). Specific heat shows a broad peak comprised of two weak kink features at TN1 ∼ 6 K and TN2 ∼ 3.5 K, the relative weights of which can be modified by sample annealing. Neutron powder diffraction measurements reveal short range quasi-2D order that is established below TN1 and TN2, at which two separate, incompatible, short range magnetic orders onset: commensurate antiferromagnetic correlations with correlation length ξc = 60 ± 2 Å (TN1) and in quasi-2D helical domains with ξ h = 350 ± 11 Å (TN2). The ac magnetic susceptibility response lacks frequency dependence, ruling out spin freezing. Inelastic neutron scattering data on γ-BCPO is compared with linear spin wave theory, and two separate parameter regions of the XXZ J1-J2-J3 model with ferromagnetic nearest-neighbor exchange J1 are favored, both near regions of high classical degeneracy. High energy coherent excitations (∼ 10 meV) persist up to at least 40 K, suggesting strong in-plane correlations persist above TN . These data show that γ-BCPO is a rare highly frustrated, quasi-2D Seff= 1/2 honeycomb lattice material which resists long range magnetic order and spin freezing. arXiv:1712.06208v2 [cond-mat.str-el]

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“…• Method 1: We adapted the synthesis method reported in Ref. 29 by adjusting relative proportions of reactants in an effort to produce larger crystals.…”

Section: Appendix A: Sample Synthesismentioning

confidence: 99%

Short-range order in the quantum XXZ honeycomb lattice material BaCo2(PO4)2

et al. 2018

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“…, Cu [18]), BaT 2 (PO 4 ) 2 (T = Co [19], Ni [20], Cu [21], Zn [22]), Sr 2 T(PO 4 ) 2 (T = Ni [23]), SrT 2 (PO 4 ) 2 (T = Co [24], Ni [25], Zn [26]) new phases have been characterized. The structural diversity in this class of compounds is surprising.…”

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confidence: 99%

Preparation and Structure Determination of SrMn2(PO4)2 and Redetermination of b ′-Mn3(PO4)2

El-Bali

Boukhari²,

Glaum

et al. 2000

Z. anorg. allg. Chem.

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Pale rose single crystals of SrMn 2 (PO 4 ) 2 were obtained from a mixture of SrCl 2´6 H 2 O, Mn(CH 3 COO) 2 , and (NH 4 ) 2 HPO 4 after thermal decomposition and finally melting at 1100°C. The new crystal structure of strontium manganese orthophosphate [P-1, Z = 4, a = 8.860(6) A Ê , b = 9.054(6) A Ê , c = 10.260(7) A Ê , a = 124.27(5)°, b = 90.23(5)°, c = 90.26(6)°, 4220 independent reflections, R1 = 0.034, wR2 = 0.046] might be described as hexagonal close-packing of phosphate groups. The octahedral, tetrahedral and trigonal-bipyramidal voids within this [PO 4 ] packing provide different positions for 8-and 10-fold [SrO x ] and distorted octahedral [MnO 6 ] coordination according to a formulation Mn tbpy 1 Mn tet 1 Mn oct 2 Sr oct 2 (PO 4 ) 4 . Single crystals of b'-Mn 3 (PO 4 ) 2 (pale rose) were grown by chemical vapour transport (850°C ® 800°C, P/I mixtures as transport agent). The unit cell of b'-Mn 3 (PO 4 ) 2 [P2 1 /c, Z = 12, a = 8.948(2) A Ê , b = 10.050(2) A Ê , c = 24.084(2) A Ê , b = 120.50°, 2953 independent reflections, R1 = 0.0314, wR2 = 0.095] contains 9 independent Mn 2+ . The reinvestigation of the crystal structure led to distinctly better agreement factors and significantly reduced standard deviations for the interatomic distances.

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“…In our laboratory, we have focused on the systems Ax(PO4)2My(P04)2 (A = Ca, Sr or Ba, and M = Cu, Co or Ni), resulting in the structure determinations of SrNi2(PO4)2 (El-Bali et al, 1993), Srfo2(PO4)2 (El-Bali et al, 1993b), Sr2Ni(PO4)2 (El-Bali et al, 1993a), Ba2Ni(PO4)2 (El-Bali et al, 1994), Ca8.sNi9.5(PO4)12 (El-Bali et al, 1995) and BaCuz(PO4)2 (Moqine et al, 1993). We report here the low-temperature structure of BaNi2(PO4)2, which is isostructural with BaNi2(AsO4)2 (Eymond et al, 1969), BaNi2(VO4)2 (Wichmann & MiJller-Buschbaum, 1984) and BaCo2(PO4)2 (Bircsak & Harrison, 1998).…”

Section: Commentmentioning

confidence: 50%