δ

T_C (K)

c (Å)

a (Å)

Cooling condition

Sample

0.189

110

33.78

4.350

Furnace cooled

Tl₂Sr₂Ca₂Cu₃O_10+δ

0.250

118

34.37

4.150

Quenched in air

0.298

120

37.616

3.721

Furnace cooled

Tl_1.6Hg_0.4Sr₂Ca₂Cu₃O_10+δ

0.301

130

37.889

4.056

Quenched in air