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Published in:
01-06-2014
Hydrothermal synthesis and effects of pH values on properties of CdWO4 powders
Published in: Journal of Materials Science: Materials in Electronics | Issue 6/2014
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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.