O²⁻ conductivity (σ) of Zr_1−x−yBi_xGd_yO_2−δ at different temperatures.

Conductivity (S cm−1)
Compound	650 °C	600 °C	550 °C	500 °C
Zr0.85Gd0.15O1.925	1.0 × 10−2	3.5 × 10−3	1.2 × 10−3	3.2 × 10−4
Zr0.80Gd0.20O1.9	1.4 × 10−2	4.4 × 10−3	1.9 × 10−3	4.3 × 10−4
Zr0.75Gd0.25O1.875	1.1 × 10−2	4.9 × 10−3	1.6 × 10−3	4.8 × 10−4
Zr0.70Gd0.30O1.85	1.0 × 10−3	3.8 × 10−3	2.1 × 10−3	2.2 × 10−4
Zr 0.6 Bi 0.2 Gd 0.2 O 1.8	6.2 × 10−2	3.2 × 10−2	1.1 × 10−2	1.9 × 10−3
Zr0.6Bi0.15Gd0.25O1.8	2.6 × 10−2	1.6 × 10−2	7.9 × 10−3	3.6 × 10−4
Zr0.65Bi0.15Gd0.2O1.825	1.8 × 10−2	8.8 × 10−3	2.8 × 10−3	2.7 × 10−4
Zr0.6Bi0.15Gd0.15O1.85	1.6 × 10−2	1.2 × 10−2	2.3 × 10−3	1.2 × 10−4
Zr0.7Bi0.10Gd0.30O1.8	1.2 × 10−2	4.8 × 10−3	1.8 × 10−3	4.2 × 10−4
KTa0.4Ti0.3Ge0.3O2.7 (ref. 37)	5.2 × 10−2	3.1 × 10−2	9.8 × 10−3	8.5 × 10−3
Na0.5Bi0.49Ti0.98Mg0.02O2.965 (ref. 29)		6.6 × 10−3	5.4 × 10−3	3.5 × 10−3
Zr0.92Y0.08O1.96 (ref. 29)		4.4 × 10−3	2.3 × 10−3	1 × 10−3
Ce0.9Gd0.1O1.95 (ref. 29)		2.3 × 10−2	1.2 × 10−2	6.5 × 10−3
La0.9Sr0.1Ga0.9Mg0.1O2.9 (ref. 29)		2.5 × 10−2	1.5 × 10−2	6.5 × 10−3