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Determination of paramagnetic concentrations inside a diamagnetic matrix using solid-state NMR

Abstract : The determination of very low doping levels in solid materials is an important issue for many applications. When considering paramagnetic dopants, NMR relaxation technique appears to be much more accurate than classical techniques such as the Vegard's law resulting from X-ray diffraction (XRD) measurement or chemical analysis that cannot provide information of appropriate dopant spatial distribution. In a recent report, the linear variation of 1/T1, i.e. the nuclear relaxation rate, as a function of Nd3+ content has been used to determine doping levels with a good dispersion homogeneity in the monazite LaPO4 matrix down to 0.1 mol. %. We here extend this study to more complex compounds doped with Nd3+ , such as YPO4, the solid solution Y0.8Sc0.2PO4, Ba5(PO4)3Cl and a phosphate glass. For all considered compounds except Ba5(PO4)3Cl:Nd, 1/T1 is found to be linearly proportional to the nominal Nd concentration, confirming the ability of the method to investigate dopant concentration and spatial homogeneity. The results on different compounds open the discussion on the parameters influencing the nuclear relaxation rate, among which the orbital overlap and the average P-P distances.
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https://hal.archives-ouvertes.fr/hal-03054309
Contributor : Sébastien Maron <>
Submitted on : Friday, December 11, 2020 - 1:39:24 PM
Last modification on : Wednesday, May 12, 2021 - 3:44:29 AM
Long-term archiving on: : Friday, March 12, 2021 - 7:36:15 PM

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Sébastien Maron, Nadège Ollier, Thierry Gacoin, Géraldine Dantelle. Determination of paramagnetic concentrations inside a diamagnetic matrix using solid-state NMR. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2017, 19 (19), pp.12175-12184. ⟨10.1039/c7cp00451f⟩. ⟨hal-03054309⟩

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