Volume compression of cerium up to 4 GPa

Singh, AK (1980) Volume compression of cerium up to 4 GPa. High Temperatures - High Pressures, 12. pp. 47-59.

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The volume compression of cerium was remeasured up to 4 GPa.The bulk modulus and its pressure derivative, as calculated from the compression data, are respectively 19 . 1 GPa and -10 for y-cerium. The y-+ a transition was found to occur at 0 . 77 GPa with 0 . 2 GPa hysteresis for the y;0 a transition. The bulk modulus of the a-phase immediately after the transition is very low (14 GPa)13; and its pressure derivative large (- 10). The pressure derivative of the bulk modulus becomes normal beyond ^'2 GPa. The anomalous volume compression of y-cerium has been explained in terms of a continuous delocalization under pressure of 4f electrons. The average fraction of 4f electrons delocalized under pressure has been estimated. The pressure variation of the gap between the 4f electrons and the Fermi level has been estimated from the compression data and found to be 0 .04 eV GPa'.An estimate of the valency of a-cerium suggests that it approaches +4 state as the pressure is increased. The valency prior to the a -* a' transition is estimated to be 3.8 xB1; 0.1.

Item Type: Article
Additional Information: Copyright for this article belongs to Pion Publication
Uncontrolled Keywords: Volume compression;Cerium;4 GPa
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: M/S ICAST NAL
Date Deposited: 06 Jun 2008
Last Modified: 17 Jun 2010 05:40
URI: http://nal-ir.nal.res.in/id/eprint/4701

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