Proton spin lattice relaxation in ferroelectric ammonium iodate

Shenoy, R. K.; Ramakrishna, J.

doi:10.1080/00150198308227866

Cited by 2 publications

(1 citation statement)

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“…Taking these results together indicates that the material at low temperature does not display ferroelectricity but rather is a 'lossy' dielectric which may be associated with the reduced motion of the ammonium ions at low temperature. Further evidence for this can be seen in a proton spin relaxation NMR study of this material between 100 and 425 K (Shenoy & Ramakrishna, 1983), which concluded that their results were 'typical of a hindered solid with motions freezing around 77 K'. Our results suggest that this freezing occurs rather at 100 K and is responsible for the observed changes in dielectric behaviour.…”

Section: Discussionmentioning

confidence: 83%

Investigation of the changes in hydrogen bonding accompanying the structural reorganization at 103 K in ammonium iodate

Marshall

Jones

Knight

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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Neutron powder diffraction has been used to observe the changes in hydrogen bonding that occur as a function of temperature in ND 4 IO 3 and, thus, determine the structural features that occur during the low-temperature (103 K) phase transition. It is shown that in the deuterated material the change is not a phase change per se but rather a structural reorganization in which the hydrogen bonding becomes firmly locked in at the phase transition temperature, and stays in this configuration upon further cooling to 4.2 K. In addition, both the differences and changes in the axial thermal expansion coefficients in the region 100-290 K can be explained by the changes involving both the hydrogen bonding and the secondary IÁ Á ÁO halogen bonds.

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Section: Discussionmentioning

confidence: 83%