通过钾掺杂增强 LaMnO3 的光学、电学、磁学和热电性能,Physica Status Solidi (B) - Basic Solid State Physics

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通过钾掺杂增强 LaMnO3 的光学、电学、磁学和热电性能
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2023-07-25 , DOI: 10.1002/pssb.202300175
Hany F. Mohamed ₁ , Ahmed M. Ahmed ₁ , Mahrous R. Ahmed ₁ , José A. Paixão ₂ , Sara A. Mohamed ₁

Affiliation

对 La _{1− x} K _x MnO ₃ ( x = 0.05、0.15 和 0.25) 化合物的光学、磁阻和热电性质进行了研究。晶体学表明样品x = 0.05 和 0.15 是单相菱面体（

右 \overset{￣}{3} C $R \overset{\cdot}{3} C$

)结构，而x =0.25则接近单一菱面体相，含有少量Mn ₃ O ₄ (比例约2%)。光学特性表明，随着x掺杂的增加，反射率略有下降，其中x =0.05的样品具有最低的反射值，使其成为光伏应用的有前景的材料。电阻率测量表明样品发生了金属-半导体转变，转变温度T _ms随着K含量的增加而降低。热电数据显示出ρ – T关系的显着重合行为，该关系在转变温度 ( T _S )处出现峰值。磁化率数据表明样品在一定温度（居里温度）下发生铁顺磁转变。

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Enhancement of Optical, Electrical, Magnetic, and Thermopower Properties of LaMnO3 by Potassium-Doping

Optical, magnetoresistance, and thermoelectric properties of La_1−xK_xMnO₃ (x = 0.05, 0.15, and 0.25) compounds have been investigated. The crystallography demonstrates that the samples x = 0.05 and 0.15 are a single-phase rhombohedral (

R \bar{3} C $R \overset{\cdot}{3} C$

) structure, while x = 0.25 is near to a single rhombohedral phase with a minor amount of Mn₃O₄ (with a ratio of ≈2%). The optical properties manifest that the reflectivity decreases slightly with increasing x-doping, where the sample of x = 0.05 has the lowest reflection value, making it a promising material for photovoltaic applications. Electrical resistivity measurements show that the samples have a metal–semiconductor transition, and the transition temperature T_ms decreases with the K content. The thermoelectric data show a remarkable coincidence behavior of the ρ–T relationship, which has a peak at a transition temperature (T_S). Magnetic susceptibility data show that the samples undergo ferro-paramagnetic transition at a certain temperature (Curie temperature).

更新日期：2023-07-25

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