In situ high-temperature nuclear magnetic resonance characterization of structural evolution in pure gallium melt

2019 ◽  
Vol 100 (10) ◽  
Author(s):  
Liang Peng ◽  
Enyi Chen ◽  
Shiyu Liu ◽  
Xun Liu ◽  
Yao Yu
Keyword(s):  
Nuclear Magnetic Resonance ◽  
High Temperature ◽  
Magnetic Resonance ◽  
Structural Evolution ◽  
Nuclear Magnetic

High-precision nuclear magnetic resonance probe suitable for in situ studies of high-temperature metallic melts

2022 ◽  
Author(s):  
Ao Li ◽  
Wei Xu ◽  
Xiao Chen ◽  
Bing-Nan Yao ◽  
Jun-Tao Huo ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
High Temperature ◽  
Magnetic Resonance ◽  
Signal To Noise Ratio ◽  
Structural Evolution ◽  
Performance Testing ◽  
Rf Coil ◽  
Metallic Melts ◽  
Nuclear Magnetic

Abstract High-temperature nuclear magnetic resonance (NMR) has proven to be very useful for detecting the temperature-induced structural evolution and dynamics in melts. However, the sensitivity and precision of high-temperature NMR probes are limited. Here we report a sensitive and stable high-temperature NMR probe based on laser-heating, suitable for in situ studies of metallic melts, which can work stably at the temperature of up to 2000 K. In our design, a well-designed optical path and the use of a water-cooled copper radio-frequency (RF) coil significantly optimize the signal-to-noise ratio (S/NR) at high temperatures. Additionally, a precise temperature controlling system with an error of less than ±1 K has been designed. After temperature calibration, the temperature measurement error is controlled within ±2 K. As a performance testing, 27Al NMR spectra are measured in Zr-based metallic glass-forming liquid in situ. Results show that the S/NR reaches 45 within 90 s even when the sample's temperature is up to 1500 K and that the isothermal signal drift is better than 0.001 ppm per hour. This high-temperature NMR probe can be used to clarify some highly debated issues about metallic liquids, such as glass transition and liquid-liquid transition.

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