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 V3Si (Materials Project id mp-571211)

       286       55       55        0        0        0  
        55      286       55        0        0        0  
        55       55      286        0        0        0  
         0        0        0      -55        0        0  
         0        0        0        0      -55        0  
         0        0        0        0        0      -55  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 132 GPaEV = 38.323 GPaGV = 13.2 GPaνV = 0.45161
ReussKR = 132 GPaER = -609.68 GPaGR = -134.3 GPaνR = 1.2698
HillKH = 132 GPaEH = -214.44 GPaGH = -60.551 GPaνH = 0.77076

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-55 GPa -55 GPa -55 GPa 231 GPa 231 GPa 396 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.