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|Title:||Structural investigation of Np2Co17 and analogue compounds under pressure|
|Authors:||HEN AMIR; HEATHMAN STEPHEN; ELOIRDI Rachel; GRIVEAU Jean-Christophe; ELGAZZAR S.; OPPENEER P.m.; HALEVY Itzhak; ORION I.; CACIUFFO Roberto|
|Citation:||PHYSICAL REVIEW B vol. 90 no. 5 p. 054107|
|Publisher:||AMER PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||The structural behavior of Np2Co17 is investigated by means of high-pressure diamond-anvil compression measurements and is compared with that of the isostructural compounds Lu2Co17 and Lu2Ni17. The Th2Ni17-type hexagonal crystal structure is preserved with no measurable discontinuous volume collapses up to the highest achieved pressure, p = 43 GPa. For Np2Co17, fits to the Birch-Murnaghan and Vinet equations of state give values of the isothermal bulk modulus and its pressure derivative of B0 = 286 GPa and B 0= 3, revealing that this Np compound is a highly incompressible solid with stiffness comparable to that of superhard covalently bonded materials. For the Lu2T17 (T = Co, Ni) compounds, the measured bulk modulus changes from B0 = 137 GPa for T = Co to B0 = 257 GPa for T = Ni. The isothermal equation of state for the studied compounds are in excellent agreement with the results of ab initio fully relativistic, full-potential local spin-density functional calculations. Theoretical estimates of the bulk modulus are given also for Np2Ni17, for which B0 is predicted to assume values intermediate between those measured for Lu2Ni17 and Np2Co17.|
|JRC Directorate:||Nuclear Safety and Security|
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