20 T/m high field gradient strength diffusion measurement system

  • Summary


Diffusion probe

Diffusion probe

50A Bipolar magnetic field gradient power supply

50A Bipolar magnetic field
gradient power supply

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)

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