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NMR of monoclinic silver sulfide α-Ag2S
Russian version
Valeeva A.A.1, Михалев K.N.2, Suvorkova E.V.2, Sadovnikov S.I.1, Gusev A.I.1
1Institute of Solid State Chemistry, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
2M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: valeevaar@mail.ioffe.ru
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109Ag-NMR spectrometry was used to examine the structure of monoclinic α-Ag2S powder. It was found that the 109Ag-NMR spectrum of monoclinic α-Ag2S had a form of a single narrow line, whose width slightly varied with temperature within 85-295 K. At a temperature below 200 K, a considerable growth of the isotropic component of shift tensor Kiso of 109Ag nuclei is observed in the Ag2S powder. Abnormally short time T2 of 109Ag spin-spin relaxation was detected. Simulation shows that, besides the acanthite described in the literature, other Ag2S phases, that are derived from high-temperature argentite, β-Ag2S, and have different structures, may be formed in silver sulfide as the temperature decreases. It is shown that the band structure of all predicted model Ag2S phases has a band gap of 0.6-1.5 eV that is indicative of semiconductor properties of the phases. Keywords: silver sulfide, 109Ag isotope, isotropic shift, spin-spin relaxation time, predicted low-temperature Ag2S phases.
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