The Lattice Stiffening Transition in UO2 Single Crystals
The effective Debye temperatures (θDE) of the surface region of UO2 single crystals, prepared by the hydrothermal synthesis technique, were obtained from temperature-dependent x-ray photoemission in the temperature range of 300 K–623 K. A lattice stiffening transition, characterized by different regions of different effective Debye temperature, 500 ± 59 K below 475 K and 165 ± 21 K above 475 K is identified. A comparison of the temperature dependence of the effective UO2 Debye temperature, with the changes in the lattice expansion coefficient for UO2, support strong lattice-phonon interaction arising from the Jahn–Teller distortion.
Journal of Physics: Condensed Matter
Young, C. M., Petrosky, J. C., Mann, J. M., Hunt, E. M., Turner, D., & Dowben, P. A. (2017). The lattice stiffening transition in UO 2 single crystals. Journal of Physics: Condensed Matter, 29(3), 035005. https://doi.org/10.1088/1361-648X/29/3/035005
IOP citation style: Christopher Young et al 2017 J. Phys.: Condens. Matter 29 035005
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The article was published online in November 2016, ahead of the print issue cited.