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|Type:||Artigo de periódico|
|Title:||Raman And Infrared Spectra Of Silica Gel And Niobium(v) Oxide Grafted On Silica Gel Surface And Their Dependence On Pretreatment Temperatures|
|Abstract:||Raman and infrared spectra are reported for silica gel with a specific surface area, SBET, of 322 m2 g-1 and an average pore size diameter of 6 nm and for silica gel chemically modified with niobium(V) oxide by grafting reaction, and thermally treated at 473-1573 K. Silica gel heated at 1273 K exhibits infrared and Raman band characteristics of α-quartz bands, while those heated to 1473 or 1573 K show infrared and Raman bands typical of α-cristobalite. Raman spectra obtained for Nb2O5-SiO2 samples heated above 1273 K upon excitation with 647.1 nm radiation were distinct from the Raman spectra excited by 488.0 and 1064 nm radiation. © 1994.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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