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 NbCo2Sn (Materials Project id mp-4583)

       135      201      201        0        0        0  
       201      135      201        0        0        0  
       201      201      135        0        0        0  
         0        0        0       72        0        0  
         0        0        0        0       72        0  
         0        0        0        0        0       72  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 179 GPaEV = 85.238 GPaGV = 30 GPaνV = 0.42063
ReussKR = 179 GPaER = -1557.9 GPaGR = -264 GPaνR = 1.9505
HillKH = 179 GPaEH = -448.78 GPaGH = -117 GPaνH = 0.91786

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-66 GPa -66 GPa 72 GPa 72 GPa 72 GPa 537 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.