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- Title
Preparation method of CeZrO/tourmaline nanocomposite with high far-infrared emissivity and its mechanism.
- Authors
Guo, Bin; Yang, Liqing; Li, Wenlong; Wang, Haojing; Zhang, Hong
- Abstract
Far-infrared functional nanocomposites were prepared by the coprecipitation method using natural tourmaline (XYZSiO(BO)VW, where X is Na, Ca, K, or vacancy; Y is Mg, Fe, Mn, Al, Fe, Mn, Cr, Li, or Ti; Z is Al, Mg, Cr, or V; V is O, OH; and W is O, OH, or F) powders, ammonium cerium(IV) nitrate and zirconium(IV) nitrate pentahydrate as raw materials. The reference sample tourmaline modified with ammonium cerium(IV) nitrate alone was also prepared by a similar precipitation route. The results of Fourier transform infrared spectroscopy show that Ce-Zr can further enhance the far-infrared emission properties of tourmaline than Ce alone. Through characterization by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), the mechanism by which Ce(-Zr) acts on the far-infrared emission property of tourmaline was systematically studied. The XPS spectra show that the Fe ratio inside tourmaline powders after heat treatment can be raised by doping Ce and further raised after adding Zr. Moreover, it is showed that Ce is dominant inside the samples, but its dominance is replaced by Ce outside. In addition, XRD results indicate the formation of CeO and CeZrO crystallites during the heat treatment, and further, TEM observations show they exist as nanoparticles on the surface of tourmaline powders. Based on these results, we attribute the improved far-infrared emission properties of Ce-Zr-doped tourmaline to the enhanced unit cell shrinkage of the tourmaline arisen from much more oxidation of Fe (0.074 nm in radius) to Fe (0.064 nm in radius) inside the tourmaline caused by Zr enhancing the redox shift between Ce and Ce via improving the oxygen mobility in the Ce-Zr crystal.
- Subjects
TOURMALINE; NANOCOMPOSITE materials; COPRECIPITATION (Chemistry); EMISSIVITY; ZIRCONIUM compounds; CESIUM compounds
- Publication
Applied Physics A: Materials Science & Processing, 2016, Vol 122, Issue 2, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-015-9586-1