20 T/m high field gradient strength diffusion measurement system_NM210006E November 29, 2021 Applications, Nuclear Magnetic Resonance (NMR) 0 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) For full details: Attached files often contain the full content of the item you are viewing. Be sure and view any attachments. 20 Tm high field gradient strength diffusion measurement system_NM210006E.pdf 225.6 KB Showing 0 Comment Comments are closed.