Dependence of the electrical and magnetic properties of La0.845Sr0.155MnO3:Ag0.4 ceramics on its sintering time

Li, Hongjiang; Chu, Kaili; Pu, Xingrui; Sun, Tao; Dong, Gang; Liu, Yang; Zhang, Shuai; Liu, Xiang

doi:10.1007/s10854-019-01628-y

Cited by 8 publications

(2 citation statements)

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“…The addition of a secondary phase has the potential to improve the grain boundary effect in perovskite manganates [21]- [23]. Researchers have studied a range of composite perovskite manganite materials, including those incorporating Ag [24], NiO [25], ZnO [26], CuO [2], TiO2 [27], MgO [20], Ta2O5 [28].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Hongjiang et al found that the thermal conductivity resistance (TCR) value for LCMO/Ag ceramics increases to a maximum with increasing sintering time, before eventually decreasing, while the magnetoresistance (MR) value gradually increases. This makes these materials suitable for use in uncooled infrared bolometers and magnetic sensors [24]. Y.J.…”

Section: Introductionmentioning

confidence: 99%

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Regulating the Electron Transport Mechanism and Increasing Magnetoresistance: The Role of CuO Filler in La0.7Sr0.2Ca0.1MnO3 Grain Boundary

Zulkarnain

Imaduddin²,

Munazat

et al. 2023

Preprint

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Magnetoresistance in perovskite materials has been extensively studied due to their great potential in spintronics technology. Perovskite samples composite with metal oxides can modify electrical properties, which can subsequently improve LFMR under low magnetic fields. In this study, we investigate changes in electrical properties at different temperatures of polycrystalline (1-x)La0.7Sr0.2Ca0.1MnO3/xCuO (LC) composites, where x = 0, 0.05, 0.10, 0.15, and 0.20. Polycrystalline La0.7Sr0.2Ca0.1MnO3 (LSCMO) was synthesized using the sol-gel method and CuO powder as a filler was mixed with LSCMO using wet. The LC composite was then oven-dried to remove moisture, compacted at 10 MPa, and sintered at 1200°C for 12 hours. All samples in the LSCMO phase have a rhombohedral structure with space group R3c. The crystal structure parameters were studied using Rietveld refinement through GSAS II software. SEM results show that CuO is in the LSCMO grain boundary and confirmed by EDS. As the CuO composition increased, the magnetization decreased, as observed by VSM at room temperature. The electrical transport properties of pure LSCMO and LC composites were studied from 5 to 300 K characterized by a cryogenic magnetometer. LC resistivity is higher than LSCMO, and the more CuO content, the smaller the metal transition temperature. CuO present at the grain boundary can decrease the resistivity value as compared to LSCMO. Additionally, the CuO layer weakens spin polarized tunneling intergrain, ultimately impacting the magnetoresistance value. The highest magnetoresistance value is for the LC15 composite at a temperature of 5K with an external field of 2T at 28.5%.

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