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FTIR spectroscopy and X-ray diffraction characterization of Nb doped sol-gel silica

✍ Scribed by J. Méndez-Vivar; P. Bosch; V. H. Lara

Publisher
Springer
Year
1996
Tongue
English
Weight
526 KB
Volume
6
Category
Article
ISSN
0928-0707

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✦ Synopsis

Nb doped silica was prepared by the sol-gel method. The experimental variables were the pH (acidic and basic) and the Nb concentration (1.0-10.0 wt.%). The samples were calcined at 300°C and 600°C and analyzed by XRD, and FTIR. The TGA and DTA of the gels were also performed. From the XRD results the radial distribution function allowed us to establish the existence of the Si-0-Nb bond in the powders.

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X-Ray Diffraction, FTIR, and NMR Characterization of Sol–Gel Alumina Doped with Lanthanum and Cerium
✍ A. Vázquez; T. López; R. Gómez; Bokhimi; A. Morales; O. Novaro 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 309 KB

Alumina doped with La and Ce was prepared by using the sol-gel technique. The doping concentrations were alternatively 2 and 5 wt% for each element. Samples were characterized as a function of temperature by using X-ray powder diffraction and FTIR spectroscopy. MAS-NMR studies showed that lanthanum