| σ (S/m) | Complex electrical conductivity |
| σo (S/m) | Pre-exponential factor |
| ΔE (kJ/mol) | Activation energy |
| ΔH (kJ/mol) | Activation enthalpy |
| ΔV (cm3/mol) | Activation volume |
| Cw (ppm) | Water content (in H/106Si) |
| (Pa) | Oxygen fugacity |
| Z* (Ω) | Complex impedance |
| B | Isothermal bulk modulus |
| β | Volume thermal expansion coefficient |
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