Proton Resonance Studies of Two Ferroelectric Sulfates

Abstract

The nuclear magnetic resonance spectrum of the protons in rubidium hydrogen sulfate, and the spin-lattice relaxation time for the protons in lithium hydrazinium sulfate have been examined as a function of temperature, in order to obtain information about the motions of the protons in the different states of these substances. Rubidium hydrogen sulfate becomes ferroelectric below -15°C, and the possibility of a change in the proton resonance linewidth associated with this transition was investigated. The free-precession (spin echo) NMR technique was used to obtain the proton spin-lattice relaxation time in lithium hydrazinium sulfate, over a wide temperature range. The observed changes in relaxation time gave further data on the hydrazinium ion motions that were inferred from proton NMR studies by Cuthbert and Petch in 1963.