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 H4IN (Materials Project id mp-643062)

        15       14       14        0        0        0  
        14       30       36        0        0        0  
        14       36       30        0        0        0  
         0        0        0        7        0        0  
         0        0        0        0        3        0  
         0        0        0        0        0        3  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 22.556 GPaEV = 9.5305 GPaGV = 3.3333 GPaνV = 0.42958
ReussKR = 14.95 GPaER = 18.428 GPaGR = 7.1174 GPaνR = 0.29456
HillKH = 18.753 GPaEH = 14.344 GPaGH = 5.2254 GPaνH = 0.37252

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-6 GPa 3 GPa 3 GPa 7 GPa 8.2161 GPa 72.784 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.