کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1487839 | 1510715 | 2014 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis, structure and properties of Na[AsW2O9] Synthesis, structure and properties of Na[AsW2O9]](/preview/png/1487839.png)
Single crystal and polycrystalline powder samples of sodium arseno-tungstate of composition Na[AsW2O9] were synthesized using high-temperature solid-state methods. The greenish single crystals of the phase were characterized by X-ray diffraction data structure determination and the bulk compound confirmed by powder X-ray data Rietveld refinements. Additionally, scanning electron microscopy (SEM) attached with energy dispersive X-Ray spectroscopy (EDX), thermogravimetry (TG), differential scanning calorimetry (DSC), fourier transform infrared (FTIR) and Raman spectroscopy was performed. A comparative study between Na[AsW2O9] and isotypic K[AsW2O9] demonstrates the structural modifications and the consequent properties. Placing sodium in the channel of the arseno-tungstate framework, the average AsO and WO bond distances did not change due to their rigid-unit like behaviors. However, the unit cell volume contracted about 7.4% caused by shrinkage of the channel dimensions due to shorter NaO bond distances. The non-linear optical property of the compound has been explained in terms of asymmetric WO and AsO chemical bonding led by WO6 and AsO4 polyhedral distortion, respectively.
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Journal: Materials Research Bulletin - Volume 60, December 2014, Pages 258–263