89Y Magic-Angle Spinning NMR of Y2Ti2-xSnxO7 Pyrochlores

Ashbrook, S. E. and Whittle, K. R. and Lumpkin, G. R. and Farnan, I. (2006) 89Y Magic-Angle Spinning NMR of Y2Ti2-xSnxO7 Pyrochlores. Journal of Physical Chemistry B, 110 (21). 10358 -10364. DOI 10.1021/jp060844q

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Abstract

The yttrium local environment in the series of pyrochlores Y2Ti2-xSnxO7 was studied using 89Y NMR. Oxides with the pyrochlore structure exhibit a range of interesting physical and chemical properties, resulting in many technological applications, including the encapsulation of lanthanide- and actinide-bearing radioactive waste. The use of the nonradioactive Y3+ cation provides a sensitive probe for any changes in the local structure and ordering with solid solution composition, through 89Y (I = 1/2) NMR. We confirm that a single pyrochlore phase is formed over the entire compositional range, with Y found only on the eight-coordinated A site. A significant (15 ppm) chemical shift is observed for each Sn substituted into the Y second neighbor coordination environment. The spectral signal intensities of the possible combinations of Sn/Ti neighbors match those predicted statistically assuming a random distribution of Sn4+/Ti4+ on the six-coordinated pyrochlore B site.

Item Type:	Article
Uncontrolled Keywords:	2006 AREP 2006 P IA51
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Journal of Physical Chemistry B
Volume:	110
Page Range:	10358 -10364
Identification Number:	10.1021/jp060844q
Depositing User:	Sarah Humbert
Date Deposited:	16 Feb 2009 13:01
Last Modified:	23 Jul 2013 10:01
URI:	http://eprints.esc.cam.ac.uk/id/eprint/123

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