Dynamic
Nuclear Polarization NMR of Low‑γ
Nuclei: Structural Insights into Hydrated Yttrium-Doped BaZrO<sub>3</sub>
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Abstract
We demonstrate that solid-state NMR
spectra of challenging nuclei
with a low gyromagnetic ratio such as yttrium-89 can be acquired quickly
with indirect dynamic nuclear polarization (DNP) methods. Proton to <sup>89</sup>Y cross polarization (CP) magic angle spinning (MAS) spectra
of Y<sup>3+</sup> in a frozen aqueous solution were acquired in minutes
using the AMUPol biradical as a polarizing agent. Subsequently, the
detection of the <sup>89</sup>Y and <sup>1</sup>H NMR signals from
technologically important hydrated yttrium-doped zirconate ceramics,
in combination with DFT calculations, allows the local yttrium and
proton environments present in these protonic conductors to be detected
and assigned to different hydrogen-bonded environments