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The role of the lattice in the $\gamma \to \alpha$ phase transition of Ce: a high pressure neutron and x-ray diffraction study by Jeong, I. -K.; Darling, T. W.; Graf, M. J.; Proffen, Th.; Heffner, R. H.; Lee, Yongjae; Vogt, T.; Jorgensen, J. D. is a scholarly article available to read on EtoBox.

What is The role of the lattice in the $\gamma \to \alpha$ phase transition of Ce: a high pressure neutron and x-ray diffraction study about?

The temperature and pressure dependence of the thermal displacements and lattice parameters were obtained across the $\gamma \to \alpha$ phase transition of Ce using high-pressure, high-resolution neutron and synchrotron x-ray powder diffraction. The estimated vibrational entropy change per atom in the $\gamma \to \alpha$ phase transition, $\Delta S^{\gamma - \alpha}_{\rm vib} \approx (0.75 \pm 0.15)$k$_{\rm B}$, is about half of the total entropy change. The bulk modulus follows a power-law pressure dependence which is well described using the framework of electron-phonon coupling. These results clearly demonstrate the importance of lattice vibrations, in addition to the spin and charge degrees of freedom, for a complete description of the $\gamma \to \alpha$ phase transition in elemental Ce.

Author

Jeong, I. -K.; Darling, T. W.; Graf, M. J.; Proffen, Th.; Heffner, R. H.; Lee, Yongjae; Vogt, T.; Jorgensen, J. D.

Published

2003

Language

EN