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 ScSi2 (Materials Project id mp-2841)

       129      168       58        0        0        0  
       168      129       58        0        0        0  
        58       58      135        0        0        0  
         0        0        0       37        0        0  
         0        0        0        0       37        0  
         0        0        0        0        0      -20  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 106.78 GPaEV = 51.306 GPaGV = 18.067 GPaνV = 0.41992
ReussKR = 99.603 GPaER = -1328.1 GPaGR = -178.4 GPaνR = 2.7223
HillKH = 103.19 GPaEH = -324.54 GPaGH = -80.165 GPaνH = 1.0242

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-39 GPa -20 GPa 37 GPa 37 GPa 100.72 GPa 331.28 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.