N. M. R. study of hydrogen motion in hydrogen uranyl phosphate (HUP) and hydrogen uranyl arsenate (HUAs)

Journal Article · Thu Jun 01 00:00:00 EDT 1978 · Mater. Res. Bull.; (United States)

DOI:https://doi.org/10.1016/0025-5408(78)90186-1· OSTI ID:6783137

Childs, P E ^[1]; Halstead, T K; Howe, A T; Shilton, M G

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1. Univ. of York, Eng.

Pulsed /sup 1/H n.m.r. measurements were made of relaxation times in hydrogen uranyl phosphate and arsenate, which are fast proton conductors. Both compounds were found to undergo a phase transition resulting in discontinuities in T/sub 1/ and T/sub 2/ and a DTA peak. This transition occurs around 274/sup 0/K in HUP and around 302/sup 0/K in HUAs. Above the transition the n.m.r. behavior of the two compounds is very similar, with an activation energy for T/sub 1/ and T/sub 2/ of 20 +- 1 kJ mol/sup -1/. The T/sub 1/ values are almost equal to T/sub 2/ values, and this can best be explained by the rapid diffusion of hydrogen. Possible mechanisms for hydrogen self-diffusion and charge transport are discussed that can account for the higher activation energies reported for the conductivities compared to those for n.m.r. relaxation.

• OSTI ID: 6783137
• Journal Information: Mater. Res. Bull.; (United States), Vol. 13:6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
HYDROGEN
SELF-DIFFUSION
HYDROGEN COMPOUNDS
PERMEABILITY
PHASE TRANSFORMATIONS
PROTON TRANSPORT
URANYL COMPOUNDS
PHOSPHATES
ARSENATES
ACTIVATION ENERGY
MOTION
NUCLEAR MAGNETIC RESONANCE
RELAXATION
TIME DEPENDENCE
ACTINIDE COMPOUNDS
ARSENIC COMPOUNDS
CHARGED-PARTICLE TRANSPORT
CRYOGENIC FLUIDS
DIFFUSION
ELEMENTS
ENERGY
FLUIDS
MAGNETIC RESONANCE
NONMETALS
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
RADIATION TRANSPORT
RESONANCE
URANIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
654001 - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments