2024
DOI: 10.1002/cphc.202300934
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Local Structure in Disordered Melilite Revealed by Ultrahigh Field 71Ga and 139La Solid‐State Nuclear Magnetic Resonance Spectroscopy

Lucia Corti,
Ivan Hung,
Amrit Venkatesh
et al.

Abstract: Multinuclear Nuclear Magnetic Resonance (NMR) spectroscopy of quadrupolar nuclei at ultrahigh magnetic field provides compelling insight into the short‐range structure in a family of fast oxide ion electrolytes with La1+xSr1–xGa3O7+0.5x melilite structure. The striking resolution enhancement in the solid‐state 71Ga NMR spectra measured with the world’s unique series connected hybrid magnet operating at 35.2 T distinctly resolves Ga sites in four‐ and five‐fold coordination environments. Detection of five‐coord… Show more

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“…Ultrahigh field NMR spectroscopy is particularly critical for the detection of half-integer quadrupolar nuclei such as 71 Ga because strong quadrupolar interactions result in a fourth-rank second-order quadrupolar broadening of the NMR resonances (in Hz) that remains even under MAS but is inversely proportional to the external magnetic field strength B 0 . While the 71 Ga MAS NMR spectra at 23.5 T are dominated by broad, overlapped resonances and show limited gain in resolution with respect to data acquired at 20 T under ν r = 65 kHz, further increasing the external magnetic field strength by 50% considerably enhances the spectral resolution, thereby enabling the detection of several distinct 71 Ga resonances at 35.2 T for both La 3 Ga 5 GeO 14 and La 3 Ga 3.5 Ge 2.5 O 14.75 , as previously observed for the related La 1+ x Sr 1– x Ga 3 O 7+0.5 x melilite family of fast oxide ion conductors …”
Section: Resultssupporting
confidence: 68%
“…Ultrahigh field NMR spectroscopy is particularly critical for the detection of half-integer quadrupolar nuclei such as 71 Ga because strong quadrupolar interactions result in a fourth-rank second-order quadrupolar broadening of the NMR resonances (in Hz) that remains even under MAS but is inversely proportional to the external magnetic field strength B 0 . While the 71 Ga MAS NMR spectra at 23.5 T are dominated by broad, overlapped resonances and show limited gain in resolution with respect to data acquired at 20 T under ν r = 65 kHz, further increasing the external magnetic field strength by 50% considerably enhances the spectral resolution, thereby enabling the detection of several distinct 71 Ga resonances at 35.2 T for both La 3 Ga 5 GeO 14 and La 3 Ga 3.5 Ge 2.5 O 14.75 , as previously observed for the related La 1+ x Sr 1– x Ga 3 O 7+0.5 x melilite family of fast oxide ion conductors …”
Section: Resultssupporting
confidence: 68%