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 NbS2 (Materials Project id mp-1874)

        65       24       -3        0        0        0  
        24       65       -3        0        0        0  
        -3       -3       -1        0        0        0  
         0        0        0        2        0        0  
         0        0        0        0        2        0  
         0        0        0        0        0       21  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 18.333 GPaEV = 30.356 GPaGV = 12.4 GPaνV = 0.22404
ReussKR = -1.0808 GPaER = -10.179 GPaGR = 73.14 GPaνR = -1.0696
HillKH = 8.6263 GPaEH = 48.369 GPaGH = 42.77 GPaνH = -0.43454

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-1.1996 GPa 2 GPa 2 GPa 21 GPa 41 GPa 89.2 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.