Effects of Al3+ Doping on the Structure and Electrical Transport Property of La0.8Sr0.2Mn1-xAlxO3

Aimei ZHANG; Jiajia ZHU; Tiancheng FANG; Xixi PAN

doi:10.15541/jim20220412

Journals >Journal of Inorganic Materials >Volume 38 >Issue 2 >Page 148 > Article

Journal of Inorganic Materials
Vol. 38, Issue 2, 148 (2023)

Effects of Al³⁺ Doping on the Structure and Electrical Transport Property of La_0.8Sr_0.2Mn_1-_xAl_xO₃

Aimei ZHANG^*, Jiajia ZHU, Tiancheng FANG, and Xixi PAN

DOI: 10.15541/jim20220412 Cite this Article

Aimei ZHANG, Jiajia ZHU, Tiancheng FANG, Xixi PAN. Effects of Al³⁺ Doping on the Structure and Electrical Transport Property of La_0.8Sr_0.2Mn_1-_xAl_xO₃[J]. Journal of Inorganic Materials, 2023, 38(2): 148 Copy Citation Text

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XRD patterns and crystal structure of La0.8Sr0.2Mn1-xAlxO3 (0≤x≤0.25)

. XRD patterns and crystal structure of La_0.8Sr_0.2Mn_1-_xAl_xO₃ (0≤x≤0.25)

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Resistivity-temperature curves of La0.8Sr0.2Mn1-xAlxO3 under the applied magnetic field of 0 and 3 T

. Resistivity-temperature curves of La_0.8Sr_0.2Mn_1-_xAl_xO₃under the applied magnetic field of 0 and 3 T

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. Model fittings of the curves of La_0.8Sr_0.2Mn_1-_xAl_xO₃ (0.1≤x≤0.25) in the high temperature region (lnρ~T^-0.25) under the applied magnetic field of 0 and 3 T

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. Magnetoresistance-temperature curves of La_0.8Sr_0.2Mn_1-_xAl_xO₃ (0.1≤x≤0.25)

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x	a/nm	b/nm	c/nm	Volume/nm³	R_wp	R_p	Mn-O-Mn/(°)	Mn-O/nm	t_G	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 La_0.8Sr_0.2Mn_1-_xAl_xO₃(0≤x≤0.25) obtained by XRD Rietveld refinement

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Al contents (Magnetic field)	ρ₀/(×10^-2, Ω·m)	ρ₂/(×10^-7, Ω·m·K^-2)	ρ_4.5/(×10^-13, Ω·m·K^-4.5)	ρ_e/(×10^-2, Ω·m·K^-0.5)	ρ_p/(×10^-14, Ω·m·K^-5)	ρ_s/(×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 La_0.8Sr_0.2Mn_1-_xAl_xO₃ (0≤x≤0.05)

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Al contents (magnetic field)	Temperature region/K	θ_D/K	υ_ph/(×10¹³, Hz)	ρ_α/(×10⁻⁵, Ω·m·K^-1)	E_a/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 La_0.8Sr_0.2Mn_0.9Al_0.1O₃

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Al contents (Magnetic field)	Temperature region/K	R²	T₀/(×10⁶, K)	ρ₀/(×10^-6, Ω·m)	N(E)/( ×10¹⁴, nm^-3·meV^-1)	R_h(75 K)/nm	E_h(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 La_0.8Sr_0.2Mn_1-_xAl_xO₃ (0.15≤x≤0.25)

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