Abstract
A novel full-range solid-solution Zn1−xCoxWO4 (0≤x≤1) was successfully developed via a facile one-pot hydrothermal route. The phase structure and microstructure were characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectra and scanning electron microscopy (SEM). The Zn1−xCoxWO4 solid solution possesses similar wolframite crystal structure with the same space group P2/c. Diffuse reflection spectroscopy (DRS) measurements on Zn1−xCoxWO4 (0≤x≤1) demonstrated that the optical band gap can be continuously tuned from 3.56eV to 2.61eV for direct transition and 1.87eV for indirect transition, respectively, with increasing x from 0 to 1. Magnetic susceptibility measurements reveal that CoWO4 has an antiferromagnetic transition at TN=42K, whereas Zn0.5Co0.5WO4 exhibits paramagnetic behavior. Moreover, CoWO4 and Zn0.5Co0.5WO4 obey the Curie–Weiss law from 200k down to 50K, and their effective magnetic moments were determined.
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