Measurements of Defect Structures by Positron Annihilation Lifetime Spectroscopy of the Tellurite Glass 70TeO2-5XO-10P2O5-10ZnO-5PbF2 (X = Mg, Bi2, Ti) Doped with Ions of the Rare Earth Element Er3+

Table 3 Positron capture parameters

Sample	τ _av[ns]	τ _b[ns]	κ _d[ns^-1]	τ ₂-τ _b[ns]	τ ₂/τ _b	η[au]
Te 1	0.229 ±0.005	0.207 ±0.004	0.704 ±0.013	0.167 ±0.003	1.803 ±0.041	0.127 ±0.002
Te 2	0.237 ±0.005	0.212 ±0.004	0.819 ±0.022	0.167 ±0.003	1.784 ±0.042	0.148 ±0.003
Te 3	0.225 ±0.005	0.204 ±0.004	0.789 ±0.022	0.149 ±0.003	1.727 ±0.031	0.138 ±0.003
Te 4	0.224 ±0.004	0.203 ±0.004	0.928 ±0.021	0.129 ±0.002	1.633 ±0.033	0.158 ±0.003
Te 5	0.232 ±0.005	0.210 ±0.004	0.825 ±0.021	0.150 ±0.003	1.714 ±0.032	0.147 ±0.003
Te 6	0.229 ±0.005	0.206 ±0.004	0.993 ±0.021	0.136 ±0.003	1.662 ±0.032	0.169 ±0.003