First-Principles Study on Various Point Defects Formed by Hydrogen and Helium Atoms in Tungsten

Table 1

Calculated and experimental lattice constants ( in Å), elastic constants ( in GPa), bulk modulus ( in GPa), Young’s modulus ( in GPa), shear modulus ( in GPa), Poisson’s ratio (), and for BCC W.

Parameters
This paper	3.18	528.06	196.73	176.28	307.17	421.26	171.95	0.27	0.560
Cal. [21]	3.17	536.32	202.25	138.70	313.61	386.83	149.42	0.29	0.478
Exp. [22]	3.16	533	205	163	314.33	417.80	163.40	0.28	0.54