Deuterium content of all samples compared to Mg(BD₄)₂, and average weight loss of independent TG-DSC measurements and calculated deuterium content “x” in Mg(BH_4−xD_x)₂ after 23 h in 3 bar D₂.

#	D content (wt%) in Mg(BD4)2	ΔTG data (wt%)	x in Mg(BH4−xDx)2
S1-D	26.0	19.0 ± 0.2	1.4 ± 0.1
S2-D	26.0	19.5 ± 0.6	1.5 ± 0.2
S3-D	24.5	16.7 ± 0.2	1.0 ± 0.1
S4-D	24.0	17.2 ± 0.4	1.3 ± 0.1