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 Pd(Se3Br)2 (Materials Project id mp-568146)

        17       15        2        0       -1        9  
        15       35        1       -2        0       14  
         2        1        2       -1       -0       -1  
         0       -2       -1        1       -1        0  
        -1        0       -0       -1        2        1  
         9       14       -1        0        1       13  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 10 GPaEV = 14.157 GPaGV = 5.6 GPaνV = 0.26404
ReussKR = -1.1474 GPaER = -2.2532 GPaGR = -0.96071 GPaνR = 0.1727
HillKH = 4.4263 GPaEH = 5.9241 GPaGH = 2.3196 GPaνH = 0.27694

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-0.13666 GPa0.73674 GPa 2.8392 GPa 6.6281 GPa 9.044 GPa 50.889 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.