Evidence of Wolframite-Type Structure in Ultrasmall Nanocrystals with a Targeted Composition MnWO4 | Zendy

Pascaline Patureau | Zendy; Rémi Dessapt | Zendy; P. Petit | Zendy; Gautier Landrot | Zendy; C. Payen | Zendy; Philippe Deniard | Zendy

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Evidence of Wolframite-Type Structure in Ultrasmall Nanocrystals with a Targeted Composition MnWO₄

Author(s) -

Pascaline Patureau,

Rémi Dessapt,

P. Petit,

Gautier Landrot,

C. Payen,

Philippe Deniard

Publication year - 2019

Publication title -

inorganic chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.348

H-Index - 233

eISSN - 1520-510X

pISSN - 0020-1669

DOI - 10.1021/acs.inorgchem.9b00464

Subject(s) - chemistry , coprecipitation , superparamagnetism , crystallite , thermogravimetric analysis , rietveld refinement , nanocrystal , crystallography , chemical composition , crystal structure , wolframite , analytical chemistry (journal) , magnetization , inorganic chemistry , nanotechnology , materials science , organic chemistry , physics , quantum mechanics , magnetic field , tungsten

Here, we report a study of white-ochre powders with targeted composition MnWO 4 prepared via a coprecipitation method. Through X-ray total scattering combined with pair distribution function analysis and Rietveld refinement of X-ray diffraction data, we find that their crystal structure is similar to that of bulk-MnWO 4 , despite a mean crystallite size of 1.0-1.6 nm and a significant deviation of the average chemical composition from MnWO 4 . The chemical formula derived from elemental and thermogravimetric analyses is Mn 0.8 WO 3.6 (OH) 0.4 ·3H 2 O. X-ray absorption and magnetic susceptibility measurements show that Mn and W have the same oxidation states as in MnWO 4 . No magnetic ordering or spin glass or superparamagnetic behavior is observed above 2 K, unlike in the case of MnWO 4 nanocrystals having a mean size higher than 10 nm.

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