Structural, Elastic, and Electronic Properties of Antiperovskite Chromium-Based Carbides ACCr₃ (A = Al and Ga)

Table 1

The coefficient 𝐴₂ in (1) as combinations for second order elastic constant for cubic crystal. 𝜂_𝛼 denotes the Lagrangian strain tensors in terms of 𝜉.

Strain type	𝐴2
𝜂1=(𝜉,0,0,0,0,0)	𝐶11
𝜂2=(𝜉,𝜉,0,0,0,0)	2𝐶11+2𝐶12
𝜂3=(𝜉,𝜉,𝜉,0,0,0)	𝐶11+4𝐶44