Journal of Inorganic Materials ›› 2023, Vol. 38 ›› Issue (2): 148-154.DOI: 10.15541/jim20220412
• RESEARCH ARTICLE • Previous Articles Next Articles
ZHANG Aimei(), ZHU Jiajia, FANG Tiancheng, PAN Xixi
Received:
2022-07-14
Revised:
2022-09-05
Published:
2023-02-20
Online:
2022-11-20
About author:
ZHANG Aimei (1978-), female, professor. E-mail: amzhang2009@hhu.edu.cn
Supported by:
CLC Number:
ZHANG Aimei, ZHU Jiajia, FANG Tiancheng, PAN Xixi. Effects of Al3+ Doping on the Structure and Electrical Transport Property of La0.8Sr0.2Mn1-xAlxO3[J]. Journal of Inorganic Materials, 2023, 38(2): 148-154.
Fig. 1 XRD patterns and crystal structure of La0.8Sr0.2Mn1-xAlxO3 (0≤x≤0.25) (a) XRD patterns of La0.8Sr0.2Mn1-xAlxO3 (0≤x≤0.25); (b) Representatively-refined XRD pattern of La0.8Sr0.2Mn0.25Al0.75O3; (c) Crystal structure of LSMAO perovskite with red balls representing O, green balls representing La, and randomly distributed Mn and Al ions in the middle of the oxygen cage; Colorful figures are available on website
x | a/nm | b/nm | c/nm | Volume/nm3 | Rwp | Rp | Mn-O-Mn/(°) | Mn-O/nm | tG | Grain size/nm |
---|---|---|---|---|---|---|---|---|---|---|
0 | 0.5526 | 0.5526 | 1.3365 | 0.35355 | 0.1589 | 0.1116 | 164.121 | 0.19646 | 0.97093 | 42.3 |
0.05 | 0.5521 | 0.5521 | 1.3357 | 0.35262 | 0.1754 | 0.1259 | 164.123 | 0.19628 | 0.97358 | 43.9 |
0.10 | 0.5509 | 0.5509 | 1.3339 | 0.35068 | 0.1764 | 0.1254 | 164.127 | 0.19592 | 0.97624 | 44.2 |
0.15 | 0.5504 | 0.5504 | 1.3334 | 0.34993 | 0.1692 | 0.1205 | 164.129 | 0.19578 | 0.97892 | 45.7 |
0.20 | 0.5492 | 0.5492 | 1.3319 | 0.34801 | 0.0858 | 0.0591 | 164.135 | 0.19542 | 0.98161 | 57.9 |
0.25 | 0.5481 | 0.5481 | 1.3304 | 0.34619 | 0.0759 | 0.0535 | 164.140 | 0.19508 | 0.98431 | 59.2 |
Table 1 Lattice constants and refined data of La0.8Sr0.2Mn1-xAlxO3 (0≤x≤0.25) obtained by XRD Rietveld refinement
x | a/nm | b/nm | c/nm | Volume/nm3 | Rwp | Rp | Mn-O-Mn/(°) | Mn-O/nm | tG | Grain size/nm |
---|---|---|---|---|---|---|---|---|---|---|
0 | 0.5526 | 0.5526 | 1.3365 | 0.35355 | 0.1589 | 0.1116 | 164.121 | 0.19646 | 0.97093 | 42.3 |
0.05 | 0.5521 | 0.5521 | 1.3357 | 0.35262 | 0.1754 | 0.1259 | 164.123 | 0.19628 | 0.97358 | 43.9 |
0.10 | 0.5509 | 0.5509 | 1.3339 | 0.35068 | 0.1764 | 0.1254 | 164.127 | 0.19592 | 0.97624 | 44.2 |
0.15 | 0.5504 | 0.5504 | 1.3334 | 0.34993 | 0.1692 | 0.1205 | 164.129 | 0.19578 | 0.97892 | 45.7 |
0.20 | 0.5492 | 0.5492 | 1.3319 | 0.34801 | 0.0858 | 0.0591 | 164.135 | 0.19542 | 0.98161 | 57.9 |
0.25 | 0.5481 | 0.5481 | 1.3304 | 0.34619 | 0.0759 | 0.0535 | 164.140 | 0.19508 | 0.98431 | 59.2 |
Fig. 2 Resistivity-temperature curves of La0.8Sr0.2Mn1-xAlxO3 under the applied magnetic field of 0 and 3 T (a) x=0; (b) x=0.05; (c) x=0.10; (d) x=0.15; (e) x=0.20; (f) x=0.25
Fig. 3 Model fittings of the curves of La0.8Sr0.2Mn1-xAlxO3 (0.1≤x≤0.25) in the high temperature region (lnρ~T-0.25) under the applied magnetic field of 0 and 3 T (a-b) Small polaron hopping model; (c-h) Variable range hopping model
Al contents (Magnetic field) | ρ0/(×10-2, Ω·m) | ρ2/(×10-7, Ω·m·K-2) | ρ4.5/(×10-13, Ω·m·K-4.5) | ρe/(×10-2, Ω·m·K-0.5) | ρp/(×10-14, Ω·m·K-5) | ρs/(×10-2, Ω·m) |
---|---|---|---|---|---|---|
x=0.00 (0 T) | -1.794 | 3.485 | -5.435 | -0.3133 | 2.589 | -1.011 |
x=0.00 (3 T) | -0.3763 | 1.012 | -1.478 | -0.07327 | 0.7181 | -0.2298 |
x=0.05 (0 T) | -19.46 | 48.02 | -111.6 | -3.747 | 56.81 | -11.5 |
x=0.05 (3 T) | -9.097 | 20.86 | -42.3 | -1.695 | 21.06 | -5.301 |
Table 2 Fitting results of low temperature metal phase for La0.8Sr0.2Mn1-xAlxO3 (0≤x≤0.05)
Al contents (Magnetic field) | ρ0/(×10-2, Ω·m) | ρ2/(×10-7, Ω·m·K-2) | ρ4.5/(×10-13, Ω·m·K-4.5) | ρe/(×10-2, Ω·m·K-0.5) | ρp/(×10-14, Ω·m·K-5) | ρs/(×10-2, Ω·m) |
---|---|---|---|---|---|---|
x=0.00 (0 T) | -1.794 | 3.485 | -5.435 | -0.3133 | 2.589 | -1.011 |
x=0.00 (3 T) | -0.3763 | 1.012 | -1.478 | -0.07327 | 0.7181 | -0.2298 |
x=0.05 (0 T) | -19.46 | 48.02 | -111.6 | -3.747 | 56.81 | -11.5 |
x=0.05 (3 T) | -9.097 | 20.86 | -42.3 | -1.695 | 21.06 | -5.301 |
Al contents (magnetic field) | Temperature region/K | θD/K | υph/(×1013, Hz) | ρα/(×10−5, Ω·m·K-1) | Ea/meV | R2 |
---|---|---|---|---|---|---|
x=0.10 (0 T) | [259.606, 300] | 527.2478 | 1.10 | 0.374 | 102.73 | 0.99923 |
x=0.10 (3 T) | [277.554, 300] | 563.2365 | 1.17 | 0.812 | 81.64 | 0.99623 |
Table 3 Fitting parameters of small polaron hopping model for La0.8Sr0.2Mn0.9Al0.1O3
Al contents (magnetic field) | Temperature region/K | θD/K | υph/(×1013, Hz) | ρα/(×10−5, Ω·m·K-1) | Ea/meV | R2 |
---|---|---|---|---|---|---|
x=0.10 (0 T) | [259.606, 300] | 527.2478 | 1.10 | 0.374 | 102.73 | 0.99923 |
x=0.10 (3 T) | [277.554, 300] | 563.2365 | 1.17 | 0.812 | 81.64 | 0.99623 |
Al contents (Magnetic field) | Temperature region/K | R2 | T0/(×106, K) | ρ0/(×10-6, Ω·m) | N(E)/( ×1014, nm-3·meV-1) | Rh(75 K)/nm | Eh(75 K)/meV |
---|---|---|---|---|---|---|---|
x=0.15 (0 T) | [225.64, 300] | 0.9994 | 13.39103 | 0.03897 | 2.21487 | 0.41377 | 94.025 |
x=0.15 (3 T) | [259.65, 300] | 0.9978 | 6.789 | 0.38214 | 4.36875 | 0.34914 | 79.34 |
x=0.20 (0 T) | [132.31, 300] | 0.9993 | 3.75859 | 275.281 | 7.8911 | 0.535565 | 121.702 |
x=0.20 (3 T) | [155.4, 300] | 0.99911 | 2.14391 | 4292.18 | 13.8343 | 0.465433 | 105.765 |
x=0.25 (0 T) | [50, 300] | 0.99814 | 12.56367 | 0.01927 | 2.36073 | 0.724161 | 164.558 |
x=0.25 (3 T) | [50, 300] | 0.99664 | 7.91716 | 0.35257 | 3.74622 | 0.645206 | 146.616 |
Table 4 Fitting parameters of variable range hopping model for La0.8Sr0.2Mn1-xAlxO3 (0.15≤x≤0.25)
Al contents (Magnetic field) | Temperature region/K | R2 | T0/(×106, K) | ρ0/(×10-6, Ω·m) | N(E)/( ×1014, nm-3·meV-1) | Rh(75 K)/nm | Eh(75 K)/meV |
---|---|---|---|---|---|---|---|
x=0.15 (0 T) | [225.64, 300] | 0.9994 | 13.39103 | 0.03897 | 2.21487 | 0.41377 | 94.025 |
x=0.15 (3 T) | [259.65, 300] | 0.9978 | 6.789 | 0.38214 | 4.36875 | 0.34914 | 79.34 |
x=0.20 (0 T) | [132.31, 300] | 0.9993 | 3.75859 | 275.281 | 7.8911 | 0.535565 | 121.702 |
x=0.20 (3 T) | [155.4, 300] | 0.99911 | 2.14391 | 4292.18 | 13.8343 | 0.465433 | 105.765 |
x=0.25 (0 T) | [50, 300] | 0.99814 | 12.56367 | 0.01927 | 2.36073 | 0.724161 | 164.558 |
x=0.25 (3 T) | [50, 300] | 0.99664 | 7.91716 | 0.35257 | 3.74622 | 0.645206 | 146.616 |
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