Thortveitite-Type Structure of Mn2V2O7.

Dorm, Ebba; Marinder, Bengt‐Olov; Vesterberg, Olof; Åkeson, Åke; Theorell, Hugo; Blinc, R.; Paušak, S.; Ehrenberg, L.; Dumanović, J.

doi:10.3891/acta.chem.scand.21-0590

Cited by 33 publications

(7 citation statements)

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“…As a kind of low-dimensional magnetic materials, Mn 2 V 2 O 7 has been receiving more and more attention in solid-state chemistry and physics [6][7][8]. These fantastic magnetic properties may be due to their layered crystal structure [9]. Mn 2 V 2 O 7 is found to have a peculiar distorted honeycomb structure, which exhibits a high-temperature form (␤-form) and a low-temperature form (␣-form).…”

Section: Introductionmentioning

confidence: 98%

“…Mn 2 V 2 O 7 is found to have a peculiar distorted honeycomb structure, which exhibits a high-temperature form (␤-form) and a low-temperature form (␣-form). Its crystallographic phase transition between ␣-forms and ␤-forms is suggested to occur below 300 K, indicating that only ␤-form can be crystallized at high temperature [9]. Fig.…”

Section: Introductionmentioning

confidence: 98%

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Molten salt synthesis and characterization of large size β-Mn2V2O7 with single crystal character

Zhou

Liu

Ding

et al. 2010

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Molten salt synthesis and characterization of large size β-Mn2V2O7 with single crystal character

Zhou

Liu

Ding

et al. 2010

Journal of Alloys and Compounds

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“…The possibilities of a lower space-group symmetry or structural disorder have been considered by many authors, although with no definite results (e.g. Cruickshank, Lynton & Barclay, 1962;Dorm & Marinder, 1967;Robertson & Calvo, 1968).…”

mentioning

confidence: 99%

Structure studies of thortveitite-like dimanganese diphosphate, Mn2P2O7

Stefanidis¹,

Nord²

1984

Acta Crystallogr C

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temperature factors. It remains to be seen whether or not a sample with composition R6T6M 5 forms an identical structure but without T-T waist contacts. (1)% V= 252.6 (1) A 3, Z= 2, Dx= 3.732 (1) Mg m -3, F(000) = 272, T= 295 K. X-ray powder diffraction data (Cr Ka l, 2 = 2.28975 A, R = 0.083 for 35 reflections), X-ray single-crystal data (MoKa, 2=0.7107A, /z=5.86mm -l, R=0.040 for 672 reflections), and neutron powder diffraction (2= 1.8820/k, R t = 0.051 for 50 reflections). Isomorphism with thortveitite, 8c2Si207, is confirmed, but the refinements, using both a linear and a split-atom model, indicate a disordered bridging oxygen in the diphosphate anion with a non-linear P-O-P bond of 165.9 (1) °. The metal-oxygen distances conform with those of similar compounds. The JCPDS Diffraction File No. is 35-1497 for Mn2P207.Introduetlon. Among the condensed diphosphates there are often groups of isomorphous compounds, e.g. many divalent-metal M2P20 7 diphosphates crystallize with the thortveitite-type structure. The crystal structure of thortveitite, (Sc,Y)2Si207, was originally determined by 0108-2701/84/121995-05501.50 Zachariasen (1930). The space-group symmetry was reported as C2/m, which implies a linear Si-O-Si bond in the disilicate anion. The metal ions are octahedrally coordinated. Since then many studies of thortveitite-type M2X207 compounds (X = Si, P, V or As) have been published, which have in common the peculiarities that the bridging oxygen has a very large thermal motion, and the XO4 tetrahedra are more regular than they should be, considering that they share corners with each other (cf Cruickshank, 1961).

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“…and 65 hours, respectively [35,36]. However, Mn2V2O7, Cu2V2O7 and Zn2V2O7 each have two structural forms (the low temperature -form and the high temperature -form) [37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 97%