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 HoBPd3 (Materials Project id mp-3693)

       208      112      112        0        0        0  
       112      208      112        0        0        0  
       112      112      208        0        0        0  
         0        0        0       -1        0        0  
         0        0        0        0       -1        0  
         0        0        0        0        0       -1  

Average properties

Averaging schemeBulk modulusYoung's modulusShear modulusPoisson's ratio
VoigtKV = 144 GPaEV = 53.497 GPaGV = 18.6 GPaνV = 0.43808
ReussKR = 144 GPaER = -5.0903 GPaGR = -1.6901 GPaνR = 0.50589
HillKH = 144 GPaEH = 24.878 GPaGH = 8.4549 GPaνH = 0.47121

Eigenvalues of the stiffness matrix

λ1 λ2 λ3 λ4 λ5 λ6
-1 GPa -1 GPa -1 GPa 96 GPa 96 GPa 432 GPa
Stiffness matrix is not definite positive, crystal is mechanically unstable
No further analysis will be performed.