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 ScS2 (Materials Project id mp-862373)

        96       43       43        0        0        0  
        43       76       77        0        0        0  
        43       77       76        0        0        0  
         0        0        0       62        0        0  
         0        0        0        0       -7        0  
         0        0        0        0        0       -7  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 63.778 GPaEV = 42.416 GPaGV = 15.267 GPaνV = 0.38916
ReussKR = 63.526 GPaER = -6.7918 GPaGR = -2.2374 GPaνR = 0.51782
HillKH = 63.652 GPaEH = 18.899 GPaGH = 6.5146 GPaνH = 0.45051

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-7 GPa -7 GPa -1 GPa 57.342 GPa 62 GPa 191.66 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.