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Hydrothermal synthesis and effects of pH values on properties of CdWO4 powders

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Abstract

Cadmium tungstate (CdWO4) powders were synthesized by a hydrothermal method at different pH values. The samples show a pure monoclinic phase with the wolframite structure when they are synthesized at higher pH values. And the sample shows the highest crystallinity at a pH value of 7. All of the CdWO4 samples show the characteristic band at 788 cm−1 corresponding to symmetrical stretching vibration of W–O–W bond in WO4 2− group in Fourier transform infrared absorption spectra. The transmission electron microscope results show that the particle sizes increase with the increase of pH value, according with the results of X-ray diffraction. All synthesized CdWO4 samples show a broad blue–green emission at 350–550 nm. The emission intensity of sample synthesized at a pH value of 4 is nearly five times of that synthesized at a pH value of 1. These results indicate that the pH values have obvious influence on properties of CdWO4 crystal in the hydrothermal synthesis.

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Acknowledgments

This work is supported by NSFC (Grant No. 51221291), Tsinghua University Initiative Scientific Research Program, and Beijing Key Lab of Fine Ceramics.

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Authors and Affiliations

  1. State Key Laboratory of New Ceramics and Fine Processing, School of Material Science and Engineering, Tsinghua University, Beijing, 100084, China

    Xiang-Cheng Chu, Ya-Nan Xu & Long-Tu Li

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  1. Xiang-Cheng Chu
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  2. Ya-Nan Xu
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  3. Long-Tu Li
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Correspondence to Xiang-Cheng Chu.

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Chu, XC., Xu, YN. & Li, LT. Hydrothermal synthesis and effects of pH values on properties of CdWO4 powders. J Mater Sci: Mater Electron 25, 2601–2604 (2014). https://doi.org/10.1007/s10854-014-1917-z

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  • DOI: https://doi.org/10.1007/s10854-014-1917-z

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