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 RbAgO (Materials Project id mp-1008813)

        32      -17      -17        0        0        0  
       -17       32      -17        0        0        0  
       -17      -17       32        0        0        0  
         0        0        0     -279        0        0  
         0        0        0        0     -279        0  
         0        0        0        0        0     -279  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = -0.66667 GPaEV = -5.9248 GPaGV = -157.6 GPaνV = -0.9812
ReussKR = -0.66667 GPaER = -6.1751 GPaGR = 70.542 GPaνR = -1.0438
HillKH = -0.66667 GPaEH = -5.7364 GPaGH = -43.529 GPaνH = -0.93411

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-279 GPa -279 GPa -279 GPa -2 GPa 49 GPa 49 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.