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- W2082676169 abstract "The conditions necessary for the synthesis of the monoclinic polymorph of CuNb2O6 from the binary oxides are reported. The yellow–green monoclinic phase has been prepared in a pure microcrystalline form and its structure determined by means of a Rietveld profile-refinement of powder X-ray data. The structure is a monoclinic distortion of the MIINb2O6 columbite type [a= 4.9991(1)Å, b= 14.1566(4)Å, c= 5.7540(1)Å, β= 91.718(1)°, space group P21/c] with a small tetragonal distortion of the CuO6 octahedra [Cu—O, 2.038(16), 2.079(19), 1.968(16), 2.016(16), 2.150(20) and 2.168(18)Å]. Above 90 K the compound is magnetically dilute and obeys the Curie law (µeff= 1.96 µB). Below 90 K there is a fairly abrupt departure from simple Curie law behaviour and a Néel point occurs at 25 K. The magnetic data have been analysed in terms of a dimeric model. The electronic spectrum of the black orthorhombic form of CuNb2O6 is consistent with a band structure whereas that of the yellow–green monoclinic form is characteristic of isolated copper(II) ions. The results of the study suggest a likely explanation for the variability in colour of the CuNb2O6 polymorphs." @default.
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- W2082676169 date "1995-01-01" @default.
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- W2082676169 title "Synthesis, structure and magnetic properties of monoclinic CuNb2O6 and the electronic spectra of both polymorphs of CuNb2O6" @default.
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- W2082676169 doi "https://doi.org/10.1039/jm9950501779" @default.
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