Hello everyone, I got a question about the Young’s modulus for mp-696497. From the structure of the crystal, it is obvious that c direction will have the smallest Young’s modulus, and a and b directions have similar Young’s modulus. However, when I look at the stiffness matrix, I saw aa direction has much smaller value and bb and cc direction has similar high value. If I understand correctly, this value isn’t Young’s modulus but should be correlated with Young’s modulus along different directions.
My question is, is there a problem with the matrix or I am reading the data incorrectly? Thanks,