ELATE: Elastic tensor analysis

Welcome to ELATE, the online tool for analysis of elastic tensors, developed by Romain Gaillac and Fran├žois-Xavier Coudert at CNRS / Chimie ParisTech.
If you use the software in published results (paper, conference, etc.), please cite the corresponding paper (J. Phys. Condens. Matter, 2016, 28, 275201) and give the website URL.

ELATE is open source software. Any queries or comments are welcome at

Summary of the properties

Input: stiffness matrix (coefficients in GPa) of InCu (Materials Project id mp-1018053)

       136       82      116        0        0        0  
        82      136      116        0        0        0  
       116      116      115        0        0        0  
         0        0        0       19        0        0  
         0        0        0        0       19        0  
         0        0        0        0        0       27  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 112.78 GPaEV = 50.911 GPaGV = 17.867 GPaνV = 0.42476
ReussKR = 115.13 GPaER = -86.435 GPaGR = -26.593 GPaνR = 0.62513
HillKH = 113.95 GPaEH = -13.259 GPaGH = -4.3633 GPaνH = 0.51939

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-5.4426 GPa 19 GPa 19 GPa 27 GPa 54 GPa 338.44 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.