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Critical point is the transition temperature of a second order phase transition. But what does tricritical point mean? WIki says that a tricritical point is a point in the phase diagram of a system at which three-phase coexistence terminates. But in this paper, it seems that the meaning of tricrital is different from Wiki.

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There is no contradiction between the explanation of the tricritical point in the Wikipedia article and the usage of the term in the paper. In the latter, they use a model which consists of several components and exhibits phase transitions. They identify a tricritical point which fits the definition in the Wikipedia article.

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WIki says that a tricritical point is a point in the phase diagram of a system at which three-phase coexistence terminates. But in this model, there seems not to be three-phase coexistence. –  hlew May 11 '13 at 11:33
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