Hydrothermal Synthesis and Crystal Structure of AgVMO<sub>5</sub> (M = Se, Te)

Pitzschke, Dragan; Jansen, Martin

doi:10.1002/zaac.200700101

Cited by 18 publications

(6 citation statements)

References 23 publications

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“…Vanadium oxides continue to attract considerable attention because of their ability to act as catalysts, − as cathode materials in batteries, − as intercalation hosts, − as ion-exchange materials, , and as magnetic materials − and for their structural versatility. − These diverse attributes originate from the various coordination environments and oxidation states found for vanadium in complex oxides. In vanadates, vanadium is typically observed in a tetrahedral, a square-planar, or an octahedral coordination environment and is found in oxidation states of 3+, 4+, or 5+.…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth, Structure, Polarization, and Magnetic Properties of Cesium Vanadate, Cs₂V₃O₈: A Structure–Property Study

et al. 2013

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Cesium vanadate, Cs2V3O8, a member of the fresnoite-type structure, was synthesized via a hydrothermal route and structurally characterized by single-crystal X-ray diffraction. Cs2V3O8 crystallizes in a noncentrosymmetric polar space group, P4bm, with crystal data of a = 8.9448(4) Å, c = 6.0032(3) Å, V = 480.31(4) Å(3), and Z = 2. The material exhibits a two-dimensional layered crystal structure consisting of corner-shared V(5+)O4 and V(4+)O5 polyhedra. The layers are separated by the cesium cations. The alignment of the individual polyhedra results in a macroscopic polarity for Cs2V3O8. Frequency-dependent polarization measurements indicate that the material is not ferroelectric. A pyroelectric coefficient of -2.0 μC m(-2) K(-1) was obtained from pyroelectric measurements taken as a function of the temperature. The magnetic susceptibility data were measured as a function of the temperature and yielded an effective magnetic moment of 1.78 μB for the V(4+) cation. Short-range magnetic ordering was observed around 7 K. The susceptibility data were fit to the Heisenberg square-lattice model supporting that the short-range magnetic interactions are antiferromagnetic and two-dimensional. IR and thermal properties were also characterized.

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Section: Introductionmentioning

confidence: 99%

Crystal Growth, Structure, Polarization, and Magnetic Properties of Cesium Vanadate, Cs₂V₃O₈: A Structure–Property Study

et al. 2013

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“…With respect to oxides that contain V 5+ and Se 4+ , a number of materials have been reported. These include (VO) 2 (SeO 3 ) 3 , (V 2 O 3 )(SeO 3 ) 2 , (VO)(SeO 3 ) 4 (OH)(H 2 O) 3 , Cd(VO 2 ) 4 (SeO 3 ) 3 (H 2 O), K(VO) 2 (SeO 3 ), A(VO 2 )(SeO 3 ) (A = Rb + , Cs + , Tl + , and Ag + ), ,, A(VO 2 ) 3 (SeO 3 ) 2 (A = K + , Rb + , Cs + , Tl + , and NH 4 + ), ,, Ba(VO 2 )(SeO 3 ) 2 (HSeO 3 ), Ba 2.5 (VO 2 ) 3 (SeO 3 ) 4 (H 2 O), Pb 2 (V 2 O 5 )(SeO 3 ) 2 , and Ba 3 (VO 2 ) 2 (SeO 3 ) 4 . Of these materials, only A(VO 2 )(SeO 3 ) (A = Rb + , Cs + , and Tl + ), ,, A(VO 2 ) 3 (SeO 3 ) 2 (A = K + , Rb + , Cs + , Tl + , and NH 4 + ) ,, are NCS and polar.…”

Section: Introductionmentioning

confidence: 99%

“…These include (VO) 2 (SeO 3 ) 3 , (V 2 O 3 )(SeO 3 ) 2 , (VO)(SeO 3 ) 4 (OH)(H 2 O) 3 , Cd(VO 2 ) 4 (SeO 3 ) 3 (H 2 O), K(VO) 2 (SeO 3 ), A(VO 2 )(SeO 3 ) (A = Rb + , Cs + , Tl + , and Ag + ), ,, A(VO 2 ) 3 (SeO 3 ) 2 (A = K + , Rb + , Cs + , Tl + , and NH 4 + ), ,, Ba(VO 2 )(SeO 3 ) 2 (HSeO 3 ), Ba 2.5 (VO 2 ) 3 (SeO 3 ) 4 (H 2 O), Pb 2 (V 2 O 5 )(SeO 3 ) 2 , and Ba 3 (VO 2 ) 2 (SeO 3 ) 4 . Of these materials, only A(VO 2 )(SeO 3 ) (A = Rb + , Cs + , and Tl + ), ,, A(VO 2 ) 3 (SeO 3 ) 2 (A = K + , Rb + , Cs + , Tl + , and NH 4 + ) ,, are NCS and polar. We have synthesized five new vanadium selenites, Ca 2 (VO 2 ) 2 (SeO 3 ) 3 (H 2 O) 2 , Sr 2 (VO 2 ) 2 (SeO 3 ) 3 , Ba(V 2 O 3 )(SeO 3 ), Sr 4 (VO 2 ) 2 (SeO 3 ) 4 (Se 2 O 5 ), and Pb 4 (VO 2 ) 2 (SeO 3 ) 4 (Se 2 O 5 ).…”

Section: Introductionmentioning

confidence: 99%

New Vanadium Selenites: Centrosymmetric Ca₂(VO₂)₂(SeO₃)₃(H₂O)₂, Sr₂(VO₂)₂(SeO₃)₃, and Ba(V₂O₅)(SeO₃), and Noncentrosymmetric and Polar A₄(VO₂)₂(SeO₃)₄(Se₂O₅) (A = Sr²⁺ or Pb²⁺)

et al. 2011

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Five new vanadium selenites, Ca(2)(VO(2))(2)(SeO(3))(3)(H(2)O)(2), Sr(2)(VO(2))(2)(SeO(3))(3), Ba(V(2)O(5))(SeO(3)), Sr(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)), and Pb(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)), have been synthesized and characterized. Their crystal structures were determined by single crystal X-ray diffraction. The compounds exhibit one- or two-dimensional structures consisting of corner- and edge-shared VO(4), VO(5), VO(6), and SeO(3) polyhedra. Of the reported materials, A(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)) (A = Sr(2+) or Pb(2+)) are noncentrosymmetric (NCS) and polar. Powder second-harmonic generation (SHG) measurements revealed SHG efficiencies of approximately 130 and 150 × α-SiO(2) for Sr(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)) and Pb(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)), respectively. Piezoelectric charge constants of 43 and 53 pm/V, and pyroelectric coefficients of -27 and -42 μC/m(2)·K at 70 °C were obtained for Sr(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)) and Pb(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)), respectively. Frequency dependent polarization measurements confirmed that the materials are not ferroelectric, that is, the observed polarization cannot be reversed. In addition, the lone-pair on the Se(4+) cation may be considered as stereo-active consistent with calculations. For all of the reported materials, infrared, UV-vis, thermogravimetric, and differential thermal analysis measurements were performed. Crystal data: Ca(2)(VO(2))(2)(SeO(3))(3)(H(2)O)(2), orthorhombic, space group Pnma (No. 62), a = 7.827(4) Å, b = 16.764(5) Å, c = 9.679(5) Å, V = 1270.1(9) Å(3), and Z = 4; Sr(2)(VO(2))(2)(SeO(3))(3), monoclinic, space group P2(1)/c (No. 12), a = 14.739(13) Å, b = 9.788(8) Å, c = 8.440(7) Å, β = 96.881(11)°, V = 1208.8(18) Å(3), and Z = 4; Ba(V(2)O(5))(SeO(3)), orthorhombic, space group Pnma (No. 62), a = 13.9287(7) Å, b = 5.3787(3) Å, c = 8.9853(5) Å, V = 673.16(6) Å(3), and Z = 4; Sr(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)), orthorhombic, space group Fdd2 (No. 43), a = 25.161(3) Å, b = 12.1579(15) Å, c = 12.8592(16) Å, V = 3933.7(8) Å(3), and Z = 8; Pb(4)(VO(2))(2)(SeO(3))(4)(Se(2)O(5)), orthorhombic, space group Fdd2 (No. 43), a = 25.029(2) Å, b = 12.2147(10) Å, c = 13.0154(10) Å, V = 3979.1(6) Å(3), and Z = 8.

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“…For general background, including bond-valence-sum calculations, see: Brown & Altermatt (1985). For related structures, see: Allen et al (2004); Becker et al (2007a,b); Jiang et al (2008);Millet et al (1999); Pitzschenke & Jansen (2007); Sauerbrei et al (1974).…”

Section: Related Literaturementioning

confidence: 99%

“…Cd 6 V 2 Se 5 O 21 (Jiang et al, 2008), α-CuVSe 2 O 7 and β-CuVSe 2 O 7 (Millet et al, 1999), AgVSeO 5 and ZnVSe 2 O 7 (Pitzschenke & Jansen, 2007). The stereochemically active lone electron pairs open up the crystal structures by creating non-bonding volumes and occupy space similar to that taken by an oxygen anion in the crystal structure.…”

Section: Data Collectionmentioning

confidence: 99%

The synthetic cobalt vanadium selenite, Co₂V₂Se₂O₁₁

2012

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The crystal structure of dicobalt(II) divanadium(V) diselenium(IV) undecaoxide, Co2V2Se2O11, exhibits a three-dimensional framework, the building units being distorted CoO6 octahedra and VO5 square pyramids arranged so as to form alternate chains along [010]. The framework has channels along [100] and [010] in which the two Ψ-SeO3 E (site symmetries m; E being the 4s 2 lone electron pair of SeIV) tetrahedra reside and connect to the other building blocks. The structure contains corner- and edge-sharing CoO6 octahedra, corner- and edge-sharing VO5 square pyramids and edge-sharing Ψ-SeO3 E tetrahedra. Co2V2Se2O11 is the first oxide containing all the cations CoII, VV and SeIV.

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Hydrothermal Synthesis and Crystal Structure of AgVMO₅ (M = Se, Te)

Cited by 18 publications

References 23 publications

Crystal Growth, Structure, Polarization, and Magnetic Properties of Cesium Vanadate, Cs₂V₃O₈: A Structure–Property Study

Crystal Growth, Structure, Polarization, and Magnetic Properties of Cesium Vanadate, Cs₂V₃O₈: A Structure–Property Study

New Vanadium Selenites: Centrosymmetric Ca₂(VO₂)₂(SeO₃)₃(H₂O)₂, Sr₂(VO₂)₂(SeO₃)₃, and Ba(V₂O₅)(SeO₃), and Noncentrosymmetric and Polar A₄(VO₂)₂(SeO₃)₄(Se₂O₅) (A = Sr²⁺ or Pb²⁺)

The synthetic cobalt vanadium selenite, Co₂V₂Se₂O₁₁

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Hydrothermal Synthesis and Crystal Structure of AgVMO5 (M = Se, Te)

Cited by 18 publications

References 23 publications

Crystal Growth, Structure, Polarization, and Magnetic Properties of Cesium Vanadate, Cs2V3O8: A Structure–Property Study

Crystal Growth, Structure, Polarization, and Magnetic Properties of Cesium Vanadate, Cs2V3O8: A Structure–Property Study

New Vanadium Selenites: Centrosymmetric Ca2(VO2)2(SeO3)3(H2O)2, Sr2(VO2)2(SeO3)3, and Ba(V2O5)(SeO3), and Noncentrosymmetric and Polar A4(VO2)2(SeO3)4(Se2O5) (A = Sr2+ or Pb2+)

The synthetic cobalt vanadium selenite, Co2V2Se2O11

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Hydrothermal Synthesis and Crystal Structure of AgVMO₅ (M = Se, Te)

Crystal Growth, Structure, Polarization, and Magnetic Properties of Cesium Vanadate, Cs₂V₃O₈: A Structure–Property Study

Crystal Growth, Structure, Polarization, and Magnetic Properties of Cesium Vanadate, Cs₂V₃O₈: A Structure–Property Study

New Vanadium Selenites: Centrosymmetric Ca₂(VO₂)₂(SeO₃)₃(H₂O)₂, Sr₂(VO₂)₂(SeO₃)₃, and Ba(V₂O₅)(SeO₃), and Noncentrosymmetric and Polar A₄(VO₂)₂(SeO₃)₄(Se₂O₅) (A = Sr²⁺ or Pb²⁺)

The synthetic cobalt vanadium selenite, Co₂V₂Se₂O₁₁