Stability criteria the criterion that a cubic crystal with one atom in the primitive cell he stable
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Stability criteria the criterion that a cubic crystal with one atom in the primitive cell he stable against small homogeneous deformations is that the energy density (43) be positive for all combinations of strain components. What restrictions are thereby imposed on the elastic stiffness constants? (In mathematical language the problem is to find the conditions that a real symmetric quadratic form should be positive definite.
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The criterion for stability of a cubic crystal is that all the principal minors o...View the full answer
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