Crystal data and refinement parameters for BLT_1−xNb_4x/5 samples with x=0.07, 0.05, and 0.10 estimated from X-ray powder diffraction data.

Sample	BLT0.95Nb0.05	BLT0.93Nb0.056	BLT0.9Nb0.08
Crystal system	Tetragonal
Space group	P4/mmm
a (Å)	3.988(5)	3.970(6)	3.965(0)
c (Å)	4016(4)	4.017(2)	4.018(1)
V (Å3)	64.15(1)	64.14(6)	64.12(6)
t G	1.016	1.015	1.017
R p (%)	7.66	8.63	8.08
R F (%)	8.28	7.08	5.95
R wp (%)	10.4	11.4	11.0
χ 2	1.57	1.68	1.89