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

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Evidence of Wolframite-Type Structure in Ultrasmall Nanocrystals with a Targeted Composition MnWO4
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-05-24 00:00:00 , DOI: 10.1021/acs.inorgchem.9b00464
Pascaline Patureau ₁ , Rémi Dessapt ₁ , Pierre-Emmanuel Petit ₁ , Gautier Landrot ₂ , Christophe Payen ₁ , Philippe Deniard ₁

Affiliation

Here, we report a study of white-ochre powders with targeted composition MnWO₄ 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-MnWO₄, despite a mean crystallite size of 1.0–1.6 nm and a significant deviation of the average chemical composition from MnWO₄. The chemical formula derived from elemental and thermogravimetric analyses is Mn_0.8WO_3.6(OH)_0.4·3H₂O. X-ray absorption and magnetic susceptibility measurements show that Mn and W have the same oxidation states as in MnWO₄. No magnetic ordering or spin glass or superparamagnetic behavior is observed above 2 K, unlike in the case of MnWO₄ nanocrystals having a mean size higher than 10 nm.

中文翻译：

目标组成为MnWO _4的超小纳米晶体中钨铁矿型结构的证据。

在这里，我们报道了通过共沉淀法制备的目标组成为MnWO ₄的白och色粉末的研究。通过X射线全散射结合对分布函数分析和X射线衍射数据的Rietveld精修，我们发现它们的晶体结构与块状MnWO ₄相似，尽管平均晶粒尺寸为1.0–1.6 nm，并且具有平均化学组成与MnWO _4的显着偏差。由元素和热重分析得到的化学式为Mn _0.8 WO _3.6（OH）_0.4 ·3H ₂ O. X射线吸收和磁化率测量表明，Mn和W具有相同的氧化态，如MnWO₄。在2 K以上没有观察到磁有序或自旋玻璃或超顺磁行为，这与MnWO ₄纳米晶体的平均尺寸高于10 nm的情况不同。

更新日期：2019-05-24

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