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 KAuSe2 (Materials Project id mp-29138)

        92        5        5        0        0        0  
         5        0       -6        0        0        0  
         5       -6        0        0        0        0  
         0        0        0        8        0        0  
         0        0        0        0        2        0  
         0        0        0        0        0        2  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 11.111 GPaEV = 19.872 GPaGV = 8.2667 GPaνV = 0.20192
ReussKR = -3.8101 GPaER = 16.481 GPaGR = 3.7103 GPaνR = 1.2209
HillKH = 3.6505 GPaEH = 11.614 GPaGH = 5.9885 GPaνH = -0.030269

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-6.5076 GPa 2 GPa 2 GPa 6 GPa 8 GPa 92.508 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.