Apparatus for high temperatures and intermediate pressures, for in situ nuclear magnetic resonance of hydrogen storage systems Available to Purchase

An apparatus is described for hydrogen nuclear magnetic resonance (NMR) in an electromagnet for temperatures up to 1300 K and pressures to 55 atm. A crucial feature for studies of transition-metal hydrides and complex hydrides of light metals is the ability to add or remove hydrogen or other gases at operating conditions, enabling in situ NMR. The sample is held in a long, closed-end ceramic tube; the tube is supported against rupture by a greater external pressure of (typically) argon gas. An electrical heater heats only the sample end of the tube; the pressurized argon is ultimately held by the inner wall of the cooling water jacket. Potential modifications are discussed for operation in a high-field solenoid and with tuning components near the coil, among other improvements.