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 OsCl2O (Materials Project id mp-29133)

       434       -1       13        0        0        0  
        -1      -14      -11        0        0       -0  
        13      -11      113        0        0        0  
         0        0        0        3        0        0  
         0        0        0        0       24        0  
         0       -0        0        0        0       -2  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 59.444 GPaEV = 98.947 GPaGV = 40.467 GPaνV = 0.22258
ReussKR = -14.459 GPaER = -49.061 GPaGR = -26.25 GPaνR = -0.065515
HillKH = 22.493 GPaEH = 19.292 GPaGH = 7.1081 GPaνH = 0.35705

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-14.946 GPa -2 GPa 3 GPa 24 GPa 113.42 GPa 434.53 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.