The compression curve of CeTe up to 25 GPa was measured by x-ray diffraction in a diamond anvil cell. Below 8 GPa, CeTe maintains the NaC1-type structure with a bulk modulus and its first pressure derivative equal to 52.8 GPa and 13.6, respectively. These values are anomalous and indicate the presence of an extra electronic contribution to the free energy. At 8+1 GPa, the NaC1-type structure transforms into a CsCl type and the increase of the cerium-tellurium distance is larger than expected from the increase of the coordination number. At higher pressures, up to 25 GPa in the CsC1 phase, the bulk modulus does not increase with pressure, and so an additive contribution to the lattice one is again present. The volume variations of CeTe with pressure are discussed assuming a valence change of the cerium ion or a strong enhancement of the Kondo interaction under pressure.28 7125
The volume change of cerium metal at the α→α′ phase transformation at 51 kbar is found to be (1.5±1) % from macroscopic measurements made in the sliding-anvil apparatus SAD 2. This value supports the proposal by Zachiarasen and Ellinger that the high-pressure forms of cerium above 51 kbar are a stable orthorhombic form with the α-uranium type of structure and a metastable monoclinic body-centered form with a deformed face-centered structure and invalidate all the other crystal structures reported so far for α′-cerium.
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