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VOLUME 67 (1998) | ISSUE 2 | PAGE 111
On the nature of the γ - α phase transition in cerium
In 1964 Davis and Adams established that a large increase of thermal expansion and compressibility in the critical region of the 7to α-Ce phase transition occurs predomi-nantely in the α phase. This provides strong evidence that a tricritical point is realized in Ce. This also means that the above mentioned transition is not isomorphic and that a-Ce should have a distorted fee structure. A scrupulous examination of Jayaraman's data (1965) shows that a second order transition line continues beyond the tricritical point to the vicinity of a triple point on the melting curve. The phase boundary with the tricritical point and the minimum of the melting curve are reconstructed within the framework of Landau theory.