Table 1.
Values of the maximum dielectric permittivity (εm), the temperature corresponding to the maximum dielectric constant (Tm), Curie–Weiss temperature (Tc), the temperature above which the dielectric constant (ε) follows the Curie–Weiss law (Tcw), (ΔTm = Tcw − ΔTm) and the critical parameter (γ), Curie–Weiss constant (C) , Energy Gap and Crystallite size for PLT ceramic at different La% concentrations.
| Sample | εm | Tm (K) |
Tc (K) |
Tcw (K) |
ΔTm (K) |
γ | C.105 K |
Energy Gap (eV) |
Crystallite size (nm) |
|---|---|---|---|---|---|---|---|---|---|
| 21% La | 3486 | 330 | 345 | 355 | 25 | 1.74 | 0.66 | 3.1 | 45.5 |
| 22% La | 2737 | 329 | 340 | 355 | 26 | 2.60 | 0.99 | 3.26 | 44.6 |
| 23% La | 3649 | 318 | 310 | 320 | 2 | 1.37 | 5.2 | 3.28 | 49.6 |
| 24% La | 3115 | 291 | 275 | 295 | 4 | 1.83 | 3.3 | 3.08 | 40.3 |
| 25% La | 2394 | 296 | 270 | 298 | 2 | 1.04 | 1.4 | 3.12 | 40.6 |