Hydrothermal Synthesis and Spectroscopic and Magnetic Behavior of the Mn7(HOXO3)4(XO4)2(X=As, P) Compounds. Crystal Structure of Mn7(HOAsO3)4(AsO4)2

Rojo, J. M.; Larrañaga, Aitor; Mesa, José L.; Urtiaga, M. Karmele; Pizarro, José L.; Arriortua, Marı́a I.; Rojo, Teófilo

doi:10.1006/jssc.2001.9528

Cited by 13 publications

(5 citation statements)

References 21 publications

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“…For the hydrothermal method, see: Assani et al (2010Assani et al ( , 2011a. For isostructural compounds, see: Zhou et al (2002); Riou et al (1987); Rojo et al (2002); Lightfoot & Cheetham (1988); Kolitsch & Bartu (2004).…”

Section: Related Literaturementioning

confidence: 99%

“…Besides, the investigation of the MO-P 2 O 5 systems (M=divalent cations) has allowed to isolate a new member of the metal phosphates, with a general formula M 7 (PO 4 ) 2 (HPO 4 ) 4 . The present paper aims to develop the hydrothermal synthesis and the structural characterization of the Mg 7 (PO 4 ) 2 (HPO 4 ) 4 which is isostructural with Fe 7 (PO 4 ) 2 (HPO 4 ) 4 (Zhou et al (2002)), Mn 7 (PO 4 ) 2 (HPO 4 ) 4 (Riou et al (1987) and (Rojo et al (2002)), Co 7 (PO 4 ) 2 (HPO 4 ) 4 (Lightfoot & Cheetham, (1988)) and with their homologue arsenate Mg 7 (AsO 4 ) 2 (HAsO 4 ) 4 (Kolitsch & Bartu, (2004)).…”

Section: S1 Commentmentioning

confidence: 99%

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Heptamagnesium bis(phosphate) tetrakis(hydrogen phosphate) with strong hydrogen bonds: Mg₇(PO₄)₂(HPO₄)₄

Assani¹,

Saadi²,

Zriouil³

et al. 2011

Acta Cryst E

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The title compound, Mg7(PO4)2(HPO4)4, was synthesized by the hydrothermal method. The structure is based on a framework of edge- and corner-sharing MgO6 and MgO4(OH)2 octahedra, an MgO5 polyhedron, PO4 and PO3(OH) tetrahedra. All atoms are in general positions except for one Mg atom, which is located on a crystallographic inversion centre. The OH groups, bridging Mg–(OH)–P, are involved in strong hydrogen bonds. Compounds with the general formula M 7(PO4)2(HPO4)4 (M = Mg, Mn, Fe and Co) are all isostructural with their homologue arsenate Mg7(AsO4)2(HAsO4)4.

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Section: Related Literaturementioning

confidence: 99%

Section: S1 Commentmentioning

confidence: 99%

Heptamagnesium bis(phosphate) tetrakis(hydrogen phosphate) with strong hydrogen bonds: Mg₇(PO₄)₂(HPO₄)₄

Assani¹,

Saadi²,

Zriouil³

et al. 2011

Acta Cryst E

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“…The Zn±P, Co±As and Zn±As analogues are apparently not known. The unit-cell volume of the title compound is distinctly smaller than that of its Mn II analogue [491.0 (3) A Ê 3 ; Rojo et al, 2002], as would be expected from the effective ionic radii of Mg II and (high-spin) Mn II (0.720 and 0.830 A Ê , respectively; Shannon, 1976).…”

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confidence: 92%

“…The title compound is isotypic with Mn 7 (AsO 4 ) 2 (HAsO 4 ) 4 (Rojo et al, 2002) and M 7 (PO 4 ) 2 (HPO 4 ) 4 , where M is Fe II (Zhou et al, 2002), a mixture of Fe II and Fe III (Vencato et al, 1994), Co II (Lightfoot & Cheetham, 1988;Rojo et al, 2001), and Mn II (Cudennec et al, 1986;Riou et al, 1987;Rojo et al, 2002). The Zn±P, Co±As and Zn±As analogues are apparently not known.…”

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confidence: 99%

Mg₇(AsO₄)₂(HAsO₄)₄: a new magnesium arsenate with a very strong hydrogen bond

Kolitsch

Bartu

2004

Acta Crystallogr C

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A new compound, heptamagnesium bis(arsenate) tetrakis(hydrogenarsenate), Mg7(AsO4)2(HAsO4)4, was synthesized by a hydrothermal method. The structure is based on a three-dimensional framework of edge- and corner-sharing MgO6, MgO4(OH)2, MgO5, AsO3(OH) and AsO4 polyhedra. Average Mg-O and As-O bond lengths are in the ranges 2.056-2.154 and 1.680-1.688 A, respectively. Each of the two non-equivalent OH groups is bonded to both an Mg and an As atom. One OH group is involved in a very short hydrogen bond [O.O = 2.468 (3) A]. The formula unit is centrosymmetric, with all atoms in general positions except for one Mg atom, which has site symmetry -1. The compound is isotypic with Mn7(AsO4)2(HAsO4)4 and M7(PO4)2(HPO4)4, where M is Fe, Co or Mn.

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“…Despite interesting features in the crystal and electronic structure of the parent Fe 7 (PO 4 ) 6 compound and a large number of the Fe 7 (PO 4 ) 6 -type compounds, magnetic properties were studied only in a few cases. In Co 7 H 4 (PO 4 ) 6 , a metamagnetic phase transition was observed in the antiferromagnetic state below 11.8 K. Antiferromagnetic ordering was found in Mn 7 H 4 (PO 4 ) 6 at 6.0 K and Mn 7 H 4 (AsO 4 ) 6 at 9.5 K. β-Cu 3 Fe 4 (VO 4 ) 6 was suggested to order antiferromagnetically at 15 K, but the magnetic structure could not be determined because of a very limited number of the observed magnetic reflections on neutron powder diffraction patterns.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Hyperfine Interactions in the Mixed-Valence Compound Fe₇(PO₄)₆ from Mössbauer Experiments

et al. 2018

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Hyperfine parameters of Fe 7 (PO 4 ) 6 phosphate were examined using 57 Fe Mossbauer spectroscopy in a wide temperature range 4.2 ≤ T ≤ 300 K. Four different iron sites were successfully detected: two for the high-spin Fe 2+ and two for Fe 3+ ions. Mossbauer spectra below T N1 ≈ 47 K were analyzed by diagonalization of the full nuclear-interaction Hamiltonian. The noticeable difference between the saturated hyperfine fields (B hf ) for the 5-foldcoordinated site (∼5.0 T) and the octahedral site (∼10.1 T) was related to the symmetry of the local crystal field. Using crystal field calculations of the energy levels based on the point symmetry of the (Fe 2+ O 5 ) and (Fe 2+ O 6 ) sites, we estimated the intra-atomic magnetic dipolar and electron orbital current contributions to the B hf field. The observed line broadening below the second magnetic phase transition at T N2 ≈ 16 K is approximated by the bimodal distribution of the hyperfine fields p(B hf ) that is characteristic of spin-modulated magnetic systems.

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Hydrothermal Synthesis and Spectroscopic and Magnetic Behavior of the Mn7(HOXO3)4(XO4)2(X=As, P) Compounds. Crystal Structure of Mn7(HOAsO3)4(AsO4)2

Cited by 13 publications

References 21 publications

Heptamagnesium bis(phosphate) tetrakis(hydrogen phosphate) with strong hydrogen bonds: Mg₇(PO₄)₂(HPO₄)₄

Heptamagnesium bis(phosphate) tetrakis(hydrogen phosphate) with strong hydrogen bonds: Mg₇(PO₄)₂(HPO₄)₄

Mg₇(AsO₄)₂(HAsO₄)₄: a new magnesium arsenate with a very strong hydrogen bond

Magnetic Hyperfine Interactions in the Mixed-Valence Compound Fe₇(PO₄)₆ from Mössbauer Experiments

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Hydrothermal Synthesis and Spectroscopic and Magnetic Behavior of the Mn7(HOXO3)4(XO4)2(X=As, P) Compounds. Crystal Structure of Mn7(HOAsO3)4(AsO4)2

Cited by 13 publications

References 21 publications

Heptamagnesium bis(phosphate) tetrakis(hydrogen phosphate) with strong hydrogen bonds: Mg7(PO4)2(HPO4)4

Heptamagnesium bis(phosphate) tetrakis(hydrogen phosphate) with strong hydrogen bonds: Mg7(PO4)2(HPO4)4

Mg7(AsO4)2(HAsO4)4: a new magnesium arsenate with a very strong hydrogen bond

Magnetic Hyperfine Interactions in the Mixed-Valence Compound Fe7(PO4)6 from Mössbauer Experiments

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Product

Resources

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Heptamagnesium bis(phosphate) tetrakis(hydrogen phosphate) with strong hydrogen bonds: Mg₇(PO₄)₂(HPO₄)₄

Heptamagnesium bis(phosphate) tetrakis(hydrogen phosphate) with strong hydrogen bonds: Mg₇(PO₄)₂(HPO₄)₄

Mg₇(AsO₄)₂(HAsO₄)₄: a new magnesium arsenate with a very strong hydrogen bond

Magnetic Hyperfine Interactions in the Mixed-Valence Compound Fe₇(PO₄)₆ from Mössbauer Experiments