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High-Temperature Magic-Angle Spin Nuclear Magnetic Resonance Reveals Sodium Ion-Doped Crystal-Phase Formation in FLiNaK Eutectic Salt Solidification
journal contribution
posted on 2021-02-22, 15:35 authored by Yiyang Liu, Rongshan Lan, Changwu Dong, Kun Wang, Xiaobin Fu, Hongtao Liu, Yuan Qian, Jianqiang WangThe
new salt heating magic-angle spin (MAS) system for high-temperature
nuclear magnetic resonance (HT-NMR) is achieved by a laser heating
beam coupled with optical fiber. The formation of a sodium ion-doped
crystal KF phase is revealed in FLiNaK ternary eutectic salt (46.5%LiF–11.5%NaF–42.0%KF),
which is considered unable to exist at room temperature according
to its phase diagram. Density functional theory (DFT) simulation proved
that Na+ ion-doped crystal is clearly ascertained to develop
with the solidification of the melt. Temperature dependence, relaxation,
and variable contact time cross-polarization NMR studies provide insights
into the unique dynamics and the spatial scale of the doped Na+ ions in KF crystals, which exhibit faster ionic vibration
due to the weakening of coordinated interactions from the ambient
F– ions.
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- Biophysics
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Keywords
Temperature dependencesalt heating magic-angleion-doped crystalsodium ion-doped crystal KF phaseKF crystalscontact time cross-polarization NMR...HT-NMRDFTMASroom temperatureFLiNaK Eutectic Salt SolidificationHigh-Temperature Magic-Angle Spin N...laser heating beamSodium Ion-Doped Crystal-Phase Form...phase diagram