Table 1: Predicted in-plane stiffness for 42 monolayer 1T-MX2 compounds.

From: Negative Poisson’s ratio in 1T-type crystalline two-dimensional transition metal dichalcogenides

M4+X23D in-plane stiffness Y3D (GPa)2D in-plane stiffness Y2D (Nm−1)
  −S2−Se2−Te2−S2−Se2−Te2
d0Ti236183108857046
 Zr210182103777144
 Hf233200117857750
d1V263226159978867
 Nb225180127877356
 Ta2652151291018557
d2Mo26124920510310492
 W2892251991139488
d3Tc232244779410434
 Re2222861579012371
d5Co 164 59
 RhNon-layered structure98Non-layered structure37
 Ir  121  45
d6Ni287248126898044
 Pd232193180776663
 Pt296244208968274
  1. The 3D in-plane stiffness (Young’s Modulus) (Y3D) is calculated from 2D in-plane stiffness (Y2D) divided by the effective layer thickness t given by t=to+0.8 Å, where to is the distance between the top and bottom chalcogen atom layers.