Phase transition in C 2O 4DND 4, ${f 1}-{f 2}$D 2O : a coherent inelastic neutron scattering studyReportar como inadecuado




Phase transition in C 2O 4DND 4, ${f 1}-{f 2}$D 2O : a coherent inelastic neutron scattering study - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.



Abstract : The low frequency dynamics related to the second order transition which takes place in ammonium deuterated oxalate has been investigated by coherent inelastic neutron scattering. This transition leads to a ferroelastic phase at zero presure and to an incommensurate phase at 5kbar. At both pressures, our experiments show that the coupling between a reorientation motion of one family of ND+4 ions and the TA phonons propagating along c* and polarized along a drives the transition, the ND4+ being coupled through a pressure dependent ANNNI model. Weak changes in the parameters explain the changes with pressure of the static and dynamical properties of the transition.





Autor: M. Krauzman M. Debeau R. Pick M. Quilichini P. Launois F. Moussa

Fuente: https://hal.archives-ouvertes.fr/



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