An NMR apparatus for the measurement of self-diffusion in solids

An apparatus is described which is suitable for

measuring self-diffusion coefficients in solids using the

nuclear magnetic resonance spin-echo technique

employing a pulsed field gradient. The design of the probe

arrangement for use at high temperature (to 1300 K) and

the electronic circuit to generate the large pulses of

magnetic field gradient are described in detail. The apparatus is designed for use with a pulsed NMR spectrometer

assuming suitable timing pulses are available. The current

switch handles 150 A, and the pulse has a fall time (to 10%)

of 50 ps and produces a field gradient of 1.5 T m-1 in a

quadrupole coil surrounding the high-temperature probe.