20 T/m high field gradient strength diffusion measurement system_NM210006E
NM210006E
Diffusion probe
50A Bipolar magnetic field
gradient power supply
| |
Specification |
| Maximum magnetic field gradient |
12T/m @ 30A
20T/m @ 50A |
| Sample tube diameter |
5 mm |
| Available Nuclei |
1H, 19F, (31P), 7Li, 11B to 17O, 15N |
| NMR lock |
2H |
| FG polarization |
Bipolar |
| VT range |
-70 to 120°C |
| Auto Tune |
Available |
* Some of observable nuclei are subject to change
The new generation diffusion probe is specially designed for diffusion applications that requires a large magnetic field gradient. By improving the design around the coil, the recovery time after field gradient pulse has been significantly shortened compared to the conventional model. Using a newly developed 50A bipolar magnetic field gradient power supply, a magnetic field gradient of 20 T/m (2000 G/cm) can be applied, making it possible to measure diffusion coefficients on the order of 10-14 m2/s. This system is ideal for measuring the diffusion of ions in solid electrolytes.
Diffusion measurement of Lithium ions in solid electrolyte
Since the 7Li signal of lithium ions in solid electrolyte often has a short T2 relaxation time, the magnetic field gradient pulse (PFG) width applied to the transverse magnetization cannot be sufficiently long. Since the diffusion coefficients of solid electrolytes are also small, it is necessary to be able to apply a large amplitude of PFG in a short time in order to obtain attenuation of the echo signal due to diffusion.
Fig. 1 shows 7Li echo signal decay plots of solid oxide electrolyte LLTZO (D=2.1x10-13 m2/s @30°C) using 30A (12 T/m) and 50A (20 T/m) magnetic field gradient power supplies. The use of the 50A power supply makes it possible to calculate the diffusion coefficient more accurately and to measure the diffusion of systems with smaller diffusion coefficients.
| Sample： |
LLTZO single crystal |
| Instruments： |
JNM-ECZ500R, Diffusion probe |
| Method： |
7Li Stimulated Echo
Diffusion time = 150ms
PFG width = 2.5 ms
Temperature = 30 °C |
Fig. 1
7Li signal decay plots of a single crystal LLTZO as a function of
gradient strength by using 30A and 50A gradient power supplies.
Courtesy of Dr. Naoaki Kuwata (NIMS)
and Dr. Junji Akimoto (AIST)