Table 2.

A comparison between two hydride ion conductors

System @ 600 °C	nH- (cm−3)	σ (S cm−1)	D (cm2 s−1)
BaH2	1.50 (2) × 1022	0.32 (3)	1.17 (3) × 10−5
β-Ca2NH	2.31 (5) × 1021	0.0782 (3)	1.63 (6) × 10−5
ratio	6.5	4.0	0.72

Although, calcium nitride-hydride has a higher diffusion coefficient than barium hydride²⁹, its overall conductivity is significantly lower due to the almost 10x lower effective charge carrier concentration. The dramatic difference in this concentration is due to the different driving mechanisms for diffusion. Standard Error are shown in parentheses and correspond to the smallest magnitude numeral.