Fig. 1
DTA curve and the values determined from the graph.
Fig. 2
DTA curves of Bi1.8Sr2Ca2Cu2.5Zn0.5O10+δ sample for various heating rates (a) β = 5 K.min-1, (b) β =10 K.min-1, (c) β = 15 K.min-1 and (d) β = 20 K.min-1.
Table 1
DTA results of Bi1.8Sr2Ca2Cu3.2-xZnxO10+δ (x = 0, 0.1, and 0.5) samples.
| Samples | Heating Rate (β) [K_min-1] | Tg [K] | Tx1 [K] | Tx2 [K] | Lasocka Parameters | E | n | ||
|---|---|---|---|---|---|---|---|---|---|
| A [K] | B | [kJ_mol-1] | |||||||
| CZn 0 | 5 | 732.0 | 741.0 | 796.8 | |||||
| 10 | 738.0 | 751.4 | 809.0 | 720.4 | 7.1 | 338.3 | 3.59 | ||
| 15 | 740.0 | 755.7 | 805.0 | ||||||
| 20 | 742.0 | 759.5 | 808.0 | ||||||
| CZn 0.1 | 5 | 738.0 | 745.4 | 799.4 | |||||
| 10 | 745.0 | 758.2 | 813.0 | 725.8 | 7.8 | 312.4 | 2.79 | ||
| 15 | 747.0 | 762.0 | 808.3 | ||||||
| 20 | 749.0 | 765.0 | 812.0 | ||||||
| CZn 0.5 | 5 | 757.0 | 766.0 | 806.0 | |||||
| 10 | 763.0 | 776.3 | 812.4 | 742.4 | 9.1 | 306.1 | 1.29 | ||
| 15 | 768.0 | 785.0 | 819.2 | ||||||
| 20 | 769.0 | 786.1 | 819.8 | ||||||
Fig. 3
vs. 1000/Tx graph for all samples according to Kissinger formula.
Fig. 4
Tg versus lnβ(K.min-1) graph of the samples according to Lasocka formula.
Fig. 5
ln[-ln(1-x)] versus ln(β) graph for the samples.
Fig. 6
XRD patterns of the samples.
Table 2
Lattice parameters a, b, c and volume (V) values of all samples.
| Samples | V(A˚ 3) | a(A˚) | b(A˚) | c(A˚) |
|---|---|---|---|---|
| CZn00 | 897.55 | 5.40 | 5.40 | 30.78 |
| CZn01 | 899.50 | 5.41 | 5.40 | 30.79 |
| CZn05 | 902.34 | 5.41 | 5.41 | 30.82 |
Fig. 7
SEM micrographs of the (a) CZn00 (b) CZn0.1 and (c) CZn0.5 samples.