Table 1. Glass compositions used to crystallize BTG sorted by GeO₂ content.

stated composition	Tg [°C]	Tx [°C](bulk)	dielectricconstant	d33 [m/V]	References
2 BaO-1 TiO2-2 SiO2- 1 GeO2			11.0	6 × 10−12	10
40 BaO-20 TiO2-40 GeO2	660–669	763		3–7 × 10−12	9,17,23
BaO- TiO2-GeO2			15.0	6–7 × 10−12	10,11
40 BaO-15 TiO2-45 GeO2	658–661	762			23
35 BaO-25 TiO2-40 GeO2	686–689	791			23
40 BaO-10 TiO2-50 GeO2	645–646	773			23
35 BaO-20 TiO2-45 GeO2	677–689	804			23
2 BaO- 1 TiO2- 2.75 GeO2	673	796			current
35 BaO-15 TiO2-50 GeO2	660–663	780–783	∼7.0	12 × 10−12	15,17,23,24
as above + furher additives	(670)	(780)			28
30 BaO-25 TiO2-45 GeO2	693–698	814			23
1 Cu-33.3 BaO-16.7 TiO2-50 GeO2	670	780			29
35 BaO-10 TiO2-55 GeO2	646–649	775			16,23
30 BaO-20 TiO2-50 GeO2	676–679	811			23
36 BaO-36 TiO2-64 GeO2			12.5	2–3 × 10−12	8
30 BaO-15 TiO2-55 GeO2	665–678	809–812	∼10.0	3.7–24.0 ± 3 × 10−12	13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23
as above + furher additives					22
30 BaO-10 TiO2-60 GeO2	653–654	749			23
25 BaO-20 TiO2-55 GeO2	680–681	761			23
25 BaO-25 TiO2-50 GeO2	691–693	813			23
25 BaO-15 TiO2-60 GeO2	673–676	734			23
20 BaO-20 TiO2-60 GeO2	669–670	733			23

Selected properties are presented. All values originate from the respective references as only two compositions are analyzed in this article.