BaMgAs2O7 and BaCoAs2O7 – synthesis, crystal structures and twinning of two new barium diarsenates

Mihajlović, T.; Kolitsch, Uwe; Effenberger, H.

doi:10.1016/j.jallcom.2004.02.016

Cited by 13 publications

(10 citation statements)

References 35 publications

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“…The average hSr-Oi and hBa-Oi bond distances are 2.722 (3) and 2.821 (4) Å , which compare well with the average hSr-Oi and hBa-Oi bond distances of 2.705 Å in SrCuAs 2 O 7 (Chen & Wang, 1996) and 2.829 Å in BaCoAs 2 O 7 (Mihajlović et al, 2004). It should be noted that some authors (Pertlik, 1986;Horng & Wang, 1994) describe M1 as eight-coordinated, taking into account only O atoms at distances less than 3 Å .…”

Section: Resultssupporting

confidence: 66%

“…The sum of the bond valences of the Ba atom in BaCuAs 2 O 7 suggests a slight oversaturation if all nine ligands are considered (AE ij = 2.2 v.u. ), but it is the same as the value calculated for BaCoAs 2 O 7 (Mihajlović et al, 2004). The longest Ba-O distance [3.008 (4) Å ] contributes 6% to the bond-valence sum.…”

Section: Resultsmentioning

confidence: 64%

“…Yet, reports on the M1 II M2 II As 2 O 7 diarsenates are rather rare. Prior to this study, the structural data for only seven diarsenates have been reported, namely SrCuAs 2 O 7 (Chen & Wang, 1996), SrCoAs 2 O 7 (Horng & Wang, 1994), PbCuAs 2 O 7 (Pertlik, 1986), BaCuAs 2 O 7 (Wardojo & Hwu, 1995;Chen & Wang, 1996), BaMgAs 2 O 7 and BaCoAs 2 O 7 (Mihajlović et al, 2004), and BaZnAs 2 O 7 (Ðord -ević, 2008).…”

Section: Introductionmentioning

confidence: 99%

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An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs₂O₇and BaCuAs₂O₇

2015

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Two isostructural diarsenates, SrZnAs2O7 (strontium zinc diarsenate), (I), and BaCuAs2O7 [barium copper(II) diarsenate], (II), have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. The three-dimensional open-framework crystal structure consists of corner-sharing M2O5 (M2 = Zn or Cu) square pyramids and diarsenate (As2O7) groups. Each As2O7 group shares its five corners with five different M2O5 square pyramids. The resulting framework delimits two types of tunnels aligned parallel to the [010] and [100] directions where the large divalent nine-coordinated M1 (M1 = Sr or Ba) cations are located. The geometrical characteristics of the M1O9, M2O5 and As2O7 groups of known isostructural diarsenates, adopting the general formula M1(II)M2(II)As2O7 (M1(II) = Sr, Ba, Pb; M2(II) = Mg, Co, Cu, Zn) and crystallizing in the space group P2₁/n, are presented and discussed.

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs₂O₇and BaCuAs₂O₇

2015

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“…For magnetic properties of BaCo 2 (AsO 4 ) 2 , see: Dojčilović et al (1994); Regnault et al (2006). For related compounds, see: Effenberger & Pertlik (1993); El-Bali et al (1993a,b); Hemon & Courbion (1990); Kreidler & Hummel (1961); Lucas et al (1998); Mihajlović et al (2004); Moquine et al (1993); Osterloh & Mü ller-Buschbaum (1994). For general background, see: Brese & O'Keeffe (1991).…”

Section: Related Literaturementioning

confidence: 99%

BaCo₂(AsO₄)₂

Đorđević

2008

Acta Crystallogr E Struct Rep Online

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Key indicators: single-crystal X-ray study; T = 293 K; mean (As-O) = 0.002 Å; R factor = 0.015; wR factor = 0.038; data-to-parameter ratio = 15.5.Suitable single crystals of the title compound, barium dicobalt(II) bis[orthoarsenate(V)], were prepared under hydrothermal conditions. This phase belongs to a series of compounds with general formula AM 2 (XO 4 ) 2 , where A = alkaline earth metal, M = Mg or a divalent first-row transition element, and X = P, As or V. BaCo 2 (AsO 4 ) 2 is isotypic with BaNi 2 (XO 4 ) 2 (X = P, V or As) and is characterized by brucitelike sheets of edge-sharing CoO 6 octahedra (3 symmetry) parallel to (001), with one-third of the octahedral positions being vacant. The sheets are capped above and below by AsO 4 tetrahedra (3 symmetry) and are interconnected by distorted BaO 12 cuboctahedra (3 symmetry). Related literature

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“…ion conductivity, ion exchange and catalytic activities). An ongoing compre-hensive study of the hydrothermal synthesis, crystallography and properties of phosphate(V), arsenate(V) and vanadate(V) compounds in the insufficiently known system M1O-M2O-X 2 O 5 -H 2 O (M1 = Sr 2+ , Cd 2+ and Ba 2+ ; M2 = Mg 2+ , Co 2+ , Ni 2+ , Cu 2+ and Zn 2+ ; X = P 5+ , As 5+ and V 5+ ) yielded a large number of new M1 2+ -, M2 2+ -and M1-M2-(H-) phosphates, arsenates and vanadates Mihajlović, Libowitzky & Effenberger, 2004;Mihajlović, Kolitsch & Effenberger, 2004;Ðordević, Š utović et al, 2008;Ðordević, Karanović & Tillmanns, 2008;Ðordević, 2008a,b), which were characterized structurally and also, in part, by spectroscopic techniques. The present contribution reports the hydrothermal synthesis and crystal structure of the novel compound dicadmium copper(II) bis[phosphate(V)], Cd 2 Cu(PO 4 ) 2 .…”

Section: Commentmentioning

confidence: 99%

Cd₂Cu(PO₄)₂

2008

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During an investigation of the insufficiently known system M1O-M2O-X(2)O(5)-H(2)O (M1 = Cd(2+), Sr(2+) and Ba(2+); M2 = Cu(2+), Ni(2+), Co(2+), Zn(2+) and Mg(2+); X = P(5+), As(5+) and V(5+)), single crystals of the novel compound dicadmium copper(II) bis[phosphate(V)], Cd(2)Cu(PO(4))(2), were obtained. This compound belongs to a small group of compounds adopting a Cu(3)(PO(4))(2)-type structure and having the general formula M1(2)M2(XO(4))(2) (M1/M2 = Cd(2+), Cu(2+), Mg(2+) and Zn(2+); X = As(5+), P(5+) and V(5+)). The crystal structure is characterized by the interconnection of infinite [Cu(PO(4))(2)](n) chains and [Cd(2)O(10)](n) double chains, both extending along the a axis. Exceptional characteristics of this structure are its novel chemical composition and the occurrence of double chains of CdO(6) polyhedra that were not found in related structures. In contrast to the isomorphous compounds, where the M1 cations are coordinated by five O atoms, the Cd atom is coordinated by six. The dissimilarity in the geometry of M1 coordination between Cd(2)Cu(PO(4))(2) and the isomorphous compounds is mostly due to the larger ionic radius of the Cd cation in comparison with the Cu, Mg and Zn cations. Sharing a common edge, two CdO(6) polyhedra form Cd(2)O(10) dimers. Each such dimer is bonded to another dimer sharing common vertices, forming [Cd(2)O(10)](n) double chains in the [100] direction. The Cu atoms, located on an inversion centre (site symmetry \overline{1}), form isolated CuO(4) squares interconnected by PO(4) tetrahedra, forming [Cu(PO(4))(2)](n) chains similar to those found in related structures. Conversely, the [Cd(2)O(10)](n) double chains, which were not found in related structures, are an exclusive feature of this structure.

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BaMgAs2O7 and BaCoAs2O7 – synthesis, crystal structures and twinning of two new barium diarsenates

Cited by 13 publications

References 35 publications

An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs₂O₇and BaCuAs₂O₇

An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs₂O₇and BaCuAs₂O₇

BaCo₂(AsO₄)₂

Cd₂Cu(PO₄)₂

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BaMgAs2O7 and BaCoAs2O7 – synthesis, crystal structures and twinning of two new barium diarsenates

Cited by 13 publications

References 35 publications

An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs2O7and BaCuAs2O7

An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs2O7and BaCuAs2O7

BaCo2(AsO4)2

Cd2Cu(PO4)2

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An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs₂O₇and BaCuAs₂O₇

An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs₂O₇and BaCuAs₂O₇

BaCo₂(AsO₄)₂

Cd₂Cu(PO₄)₂