Zener ratio

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The Zener ratio is a dimensionless number that is used to quantify the anisotropy for cubic crystals. It is sometimes referred as anisotropy ratio and is named after Clarence Zener. Conceptually, it quantifies how far a material is from being isotropic (where the value of 1 means an isotropic material).
Its mathematical definition is
$a_r =\frac{2 C_{44}}{C_{11} - C_{12}},$
where C_(ij) refers to Elastic constants in Voigt notation.

Source: https://en.wikipedia.org/wiki/Zener_ratio
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