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Article
Anomalous Elastic Behavior in hcp- and Sm-Type Dysprosium
The Journal of Physical Chemistry C
(2012)
Abstract
The compression behavior of elemental dysprosium in the hcp- and the Sm-type phases has been examined under hydrostatic pressure. Sm-type Dy has been found about 1% denser than the hcp phase. This increase in density is due to c-axis contraction in Sm-type Dy, whereas the a-axis even expands compared with the hcp-phase. Both the hcp- and the Sm-type phases show an inversion in the pressure derivative of the c/a ratio. For hcp-Dy this inversion is very sharp with minimal c/a at 2.5 GPa. At the same pressure, the compression behavior of hcp-Dy changes abruptly from dominantly c-axis compression to almost isotropic compression with slightly softer S11. The bulk modulus increases at this point by a factor of ∼2. Both hcp- and Sm-type Dy exhibit a crossover from highly anisotropic compression mostly along the c-axis to almost isotropic compression. We discuss these anomalies with respect to a possible Lifshitz transition and structural soft modes.
Keywords
- Elemental dysprosium
Disciplines
Publication Date
2012
DOI
10.1021/jp205156v
Citation Information
J. Phys. Chem. C, 2012, 116 (3), pp 2090–2096