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 CsCoN (Materials Project id mp-1029491)

        41       27        7        0        0        0  
        27       45        4        0        0        0  
         7        4      249        0        0        0  
         0        0        0        3        0        0  
         0        0        0        0       -9        0  
         0        0        0        0        0        8  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 45.667 GPaEV = 52.813 GPaGV = 20.2 GPaνV = 0.30725
ReussKR = 31.745 GPaER = 27.716 GPaGR = 10.231 GPaνR = 0.35449
HillKH = 38.706 GPaEH = 40.359 GPaGH = 15.216 GPaνH = 0.32622

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-9 GPa 3 GPa 8 GPa 15.901 GPa 69.744 GPa 249.36 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.