XRD spectra of LiNi1–xMgxPO4 (x = 0, 0.05, 0.1 and 0.15).
Table 1
Lattice parameters, space group and cell volume for different compounds.
| Compound | a[Å] | b [Å] | c [Å] | Space group | Cell volume [Å]3 |
|---|---|---|---|---|---|
| LiNiPO4 | 10.0345 | 5.8524 | 4.6629 | Pnma | 273.8411 |
| LiNi0.95Mg0.05PO4 | 10.0341 | 5.8762 | 4.6669 | Pnma | 275.1785 |
| LiNi0.90Mg0.10PO4 | 10.0533 | 5.8561 | 4.6554 | Pnma | 274.0853 |
| LiNi0.85Mg0.15PO4 | 10.0401 | 5.8598 | 4.6682 | Pnma | 275.1785 |
SEM image of LiNi1–xMgxPO4 (x = 0, 0.05, 0.1 and 0.15); (a) LiNiPO4; (b) LiNi0.95Mg0.05PO4; (c) LiNi0.90Mg0.10PO4; (d) LiNi0.85Mg0.15PO4.
EDS spectra for LiNi1–xMgxPO4 (x = 0, 0.05, 0.1 and 0.15); (a) LiNiPO4; (b) LiNi0.95Mg0.05PO4; (c) LiNi0.90Mg0.10PO4; (d) LiNi0.85Mg0.15PO4.
FT-IR spectra for LiNi1–xMgxPO4 (x = 0, 0.05, 0.1 and 0.15).
Table 2
Vibrational spectra data (cm–1) and band assignments in LiNi1–xMgxPO4(x = 0, 0.05, 0.1 and 0.15).
| Infrared wave number [cm–1] | ||||
|---|---|---|---|---|
| x = 0 | x = 0.05 | x = 0.1 | x = 0.15 | Assignment |
| 477 | 457 | 446 | 446 | v (Li–O) |
| 525 | 525 | 529 | 527 | v (Ni–O) |
| 547 | 548 | 548 | 548 | v2 (PO4)3– |
| 580 | 569 | 568 | 568 | v2 (PO4)3– |
| 653 | 649 | 649 | 649 | v4 (PO4)3– |
| 940 | 937 | 949 | 949 | v1 (PO4)3– |
| 1057 | 1060 | 1064 | 1035 | v3 (PO4)3– |
| 1100 | 1091 | 1090 | 1094 | v3 (PO4)3– |
| 1150 | 1139 | 1140 | 1134 | v3 (PO4)3– |
Nyquist plots for the compounds LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.
Variation of Z′ with frequency for the compounds LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.
Variation of Z″ with frequency for the compounds LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.
Variation of real part of dielectric permittivity (ε′) with frequency for the compounds LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.
Variation of imaginary part of dielectric permittivity (ε″) with frequency for the compounds LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.
Variation of tanδ with frequency for the compounds LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.
Table 3
Activation energies for different compounds at 100 kHz.
| Compound | AC conductivity [S/cm] | Activation energy [eV] |
|---|---|---|
| LiNiPO4 | 9.47 × 10–10 | 0.47 |
| LiNi0.95Mg0.05PO4 | 2.95 × 10–9 | 0.56 |
| LiNi0.90Mg0.10PO4 | 9.62 × 10–10 | 0.52 |
| LiNi0.85Mg0.15PO4 | 9.80 × 10–10 | 0.66 |
Variation of AC conductivity with frequency for the compounds LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.
Variation of M′ with frequency for the compounds LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.
Arrhenius plots for LiNi1–xMgxPO4 (a) x = 0, (b) x = 0.05, (c) x = 0.1, (d) x = 0.15.