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Table 5-2:   Elastic constants (in GPa) determined from the ab initio calculations with cell internal relaxations for pure
                             Zr (), Zr2H () and ZrH () phases. Values of elastic constants in parentheses for  Zr were obtained
                             experimentally at T = 4 K.

                                                 Zr ()                Zr2H ()              ZrH ()
                   C11                          142 (155)               155                    177

                   C12                           62 (67)                 84                    93
                   C13                           64 (65)                 66                    66
                   C33                          164 (172)               186                    227
                   C44                           29 (36)                 22                    32
                   C14                             0                    –23                    12
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