Elastic and thermal properties of Zr z Nb1-z C x N y solid solutions

The temperature and concentration dependences of the elastic moduli and the thermal linear expansion coefficient of Zr (z) Nb1 - z C (x) N (y) solid solutions containing from 3 to 8 at % of structural vacancies in a nonmetallic sublattice have been found. The temperature dependences of the Debye temperature I similar to(D)(T) have been calculated using the elastic data and the data on the heat capacity. It has been shown, using carbide NbC0.97 as an example, that the I similar to(D)(T) dependences found from the elastic properties and the heat capacity coincide in the temperature range similar to 220-300 K. By analogy with the niobium carbide, the heat capacity C (p) (300) of Zr (z) Nb1 - z C (x) N (y) solid solutions of various compositions is calculated based on the values of I similar to(D)(300) determined from the elastic properties.