Composite | NR4 | NR5 | NR6 | NR7 | NR8 | NR9 |
Mean value of ac conductivity | 0.0027 | 0.0040 | 0.0054 | 6.158 | 8.305 | 9.916 |
±S.D. (S/m) | ±0.003 | ±0.0071 | ±0.0102 | ±6.897 | ±8.649 | ±9.952 |