We study the behavior of the line of the unit compressibility factor (Zeno-line) in crystalline states. We used the Lennard-Jones system, experimental -- data for a number of substances, and the Debye model. We found that, contrary to the case of the liquid states, the Zeno-line in a crystal is not a straight line at the density-temperature plane. However, the corresponding pressure-temperature dependence appears to be quasi-linear. As a result, this line in the solid state can be defined by the only one point where the Zeno-line crosses the melting curve.
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