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 ReC (Materials Project id mp-10709)

       539      269      269        0        0        0  
       269      539      269        0        0        0  
       269      269      539        0        0        0  
         0        0        0     -115        0        0  
         0        0        0        0     -115        0  
         0        0        0        0        0     -115  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 359 GPaEV = -45.636 GPaGV = -15 GPaνV = 0.52119
ReussKR = 359 GPaER = -2262.6 GPaGR = -443.57 GPaνR = 1.5504
HillKH = 359 GPaEH = -873.91 GPaGH = -229.29 GPaνH = 0.90571

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-115 GPa -115 GPa -115 GPa 270 GPa 270 GPa 1077 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.