Structural investigation of mixed nitrided galloaluminophosphates "AlGaPON"' by EELS, XAS, and XPS spectroscopies
(2002) Journal of Solid State Chemistry — Vol. 163, n° 1, p. 163-177 (2002)
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- Amorphous nitrided galloaluminophosphates "AlGaPON" catalysts with nitrogen contents varying from 0 to 23.3 wt% N were obtained by nitriding an Al0.5Ga0.5PO4 precursor under ammonia flow at 750degreesC in a tubular furnace. The structural changes induced by this treatment were investigated by electron energy loss spectroscopy (EELS), X-ray absorption spectroscopy (XAS), and X-ray photoelecton spectroscopy (XPS). XANES and XPS results indicate that the first-coordination spheres of P, Ga, and Al atoms are modified by nitridation. In particular, the comparison of the P XANES spectra recorded on "AlGaPON" and on a PON phosphorus oxynitride (reference of mixed PO2,N-2, tetrahedra) reveals that mainly PO2,N-2, tetrahedra are present in highly nitrided samples. Moreover, the replacement of oxygen by nitrogen probably concerned P-O-Ga bonds rather than P-O-Al. EELS investigation reveals that the precursor is homogeneous at the used probe scale, but indicates that nitridation is accompanied by a loss of homogeneity of the material. (C) 2002 Elsevier Science.
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Delsarte, S., Serin, V., Flank, A., Villain, F., & Grange, P. (2002). Structural investigation of mixed nitrided galloaluminophosphates “AlGaPON”′ by EELS, XAS, and XPS spectroscopies. Journal of Solid State Chemistry, 163(1), 163-177. https://doi.org/10.1006/jssc.2001.9389 (Original work published 2002)