XRD and {sup 29}Si MAS-NMR spectroscopy across the {beta}-Lu{sub 2}Si{sub 2}O{sub 7}-{beta}-Y{sub 2}Si{sub 2}O{sub 7} solid solution
- Departamento de Quimica Inorganica-Instituto de Ciencia de Materiales de Sevilla, Universidad de Sevilla-CSIC. Avda. Americo Vespucio, s/n. 41092 Sevilla (Spain)
Samples in the system Lu{sub 2-x}Y{sub x}Si{sub 2}O{sub 7} (0=<x=<2) have been synthesized following the sol-gel method and calcined to 1300 deg. C, a temperature at which the {beta}-polymorph is known to be the stable phase for the end-members Lu{sub 2}Si{sub 2}O{sub 7} and Y{sub 2}Si{sub 2}O{sub 7}. The XRD patterns of all the compositions studied are compatible with the structure of the {beta}-polymorph. Unit cell parameters are calculated as a function of composition from XRD patterns. They show a linear change with increasing Y content, which indicates a solid solubility of {beta}-Y{sub 2}Si{sub 2}O{sub 7} in {beta}-Lu{sub 2}Si{sub 2}O{sub 7} at 1300 deg. C. {sup 29}Si MAS NMR spectra of the different members of the system agree with the XRD results, showing a linear decrease of the {sup 29}Si chemical shift with increasing Y content. Finally, a correlation reported in the literature to predict {sup 29}Si chemical shifts in silicates is applied here to obtain the theoretical variation in {sup 29}Si chemical shift values in the system Lu{sub 2}Si{sub 2}O{sub 7}-Y{sub 2}Si{sub 2}O{sub 7} and the results compare favorably with the values obtained experimentally.
- OSTI ID:
- 20721657
- Journal Information:
- Journal of Solid State Chemistry, Vol. 178, Issue 1; Other Information: DOI: 10.1016/j.jssc.2004.09.006; PII: S0022-4596(04)00500-6; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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