fig7

Figure 7. (A) Complex plane impedance plots of 5-SNGO recorded at temperatures 750-900 °C; (B) direct current (DC) resistivity of 4-SNO and 5-SNGO ceramics; (C) frequency dependence of normalized impedance Z″/Z″max of 5-SNGO; (D) the relationship of Z″/Z″max and M″/M″max at 800 °C of 5-SNGO.