JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 23
·1-12
·
IF 2.8
Tian Lanlan,Hou Ruiting,Wang Shaozheng,Yu Ping,Li Yule,Chen Qingming,Zhang Hui
Perovskite manganite La 1 − x Ca x MnO 3 holds promising for uncooling infrared bolometers and magnetic sensors applications due to its unique properties such as metal insulator transition and colossal magnetoresistance. However, obtaining large temperature coefficient of resistance (TCR) value and magnetoresistance (MR) value in the temperature range close to room temperature remains a huge challenge. The dispersant can improve the agglomeration of particles in the precursor during the preparation of such ceramic materials, so that the uniformity of the samples is higher. In this study, we compare the effects of dispersants sodium dodecylbenzene sulfonate (SDBS) content on the structure, morphology, and electrical transport properties of La 0.67 Ca 0.33 MnO 3 (LCMO). We found that the ceramics with appropriate addition of SDBS possess higher density and larger grain size. Appropriate addition of SDBS can significantly improve the TCR and MR of the ceramics. The peak TCR reached 28.8%·K −1 ( x = 2%), and the peak MR reached 57.6% ( x = 4%). Our findings can promote the potential application of this material in infrared detect and magnetic sensors.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Shaozheng Wang,Ruiting Hou,Lanlan Tian,Yule Li,Ping Yu,Hui Zhang,Qingming Chen
The strong metal-insulating transition and the high magnetoresistance near the Curie temperature make La x Ca 1- x MnO 3 ceramics it has potential application value in temperature detection, magnetic sensing. In this study, La 0.67 Ca 0.33 MnO 3 (LCMO) ceramics were prepared via the co-precipitation method using polyethylene glycol-2000 (PEG) as a dispersant. The investigation focused on the influence of PEG content on the crystal structure, electrical transport properties, and magnetoresistance of the ceramics. The dispersant effectively improved particle dispersion during the preparation of the precursor powder, resulting in smaller precursor powder size and enhanced sintering driving force during ceramic sintering. Consequently, the prepared ceramics exhibited larger grain size , improved uniformity, and reduced pore formation, significantly impacting their electrical and magnetic properties . The temperature coefficient of resistance (TCR) and magnetoresistance (MR) of the ceramics showed a non-monotonic behavior with increasing PEG content in the range of 0–8%. The TCR and MR initially increased, reaching maximum values of 32.2%·K −1 and 61.7%, respectively, at 4% PEG content. Beyond this point, both TCR and MR decreased. Our findings can promote the potential application of this material in infrared detect and magnetic sensors.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhaowei Liang,Sheng'an Yang,Haishan Wang,Yule Li,Junfeng Li,Baokang Hou,Junhong Li,Jie Wang,Liang Wu,Hui Zhang,Qingming Chen,Ji Ma
Perovskite manganites La 0.67 Ca 0.33 MnO 3 (LCMO) holds promising for infrared bolometer applications due to its large temperature coefficient of resistance (TCR) and low 1/ f noise. However, it remains challenging to obtain large TCR value at a wide temperature range, which inhibits its actual application. In this study, we compare the effects of sintering temperature (1200 °C ∼ 1450 °C), vanadium addition (0% and 5%), and vanadium addition route (sol-gel doping and solid-state composite) on the structure, morphology and electrical transport properties of LCMO. We found that the ceramics prepared with higher temperature possess larger grain size and higher density. Vanadium addition considerably increases the grain size as well as improves TCR value. Our findings provide an effective route to promote the infrared detect application of perovskite manganites.
研究领域:
材料科学
·
电气工程
·
红外技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Songrong Cheng,Men Shao,Ke Wang,Peilun Shen,Hao Duan,Lu Li,Baokang Hou,Xin You,Huaming Deng,Kaizhao Wang,Jin Hu,Rui Chen,Qingming Chen,Sheng'an Yang,Ji Ma
Polycrystalline La 0.67 Ca 0.33 MnO 3 films were fabricated by spin–coating, exhibiting strong structural anisotropy, along with excellent anisotropic magnetoresistance (AMR) and temperature coefficient of magnetoresistance (TCM) properties. These films show potential as materials for angle sensors in consumer electronics. The crystallinity and interface matching of La 0.67 Ca 0.33 MnO 3 films are closely linked to sintering conditions. Enhanced crystallization promotes better grain orientation, grain boundary connectivity, and lattice anisotropy, ultimately leading to improved physical properties. That is, the optimized sintering temperature of 1100 °C led to best grain boundary connectivity, resulting in −19.8 % AMR at 1T and 26.7 % TCM at 0.1T near room temperature (≈270 K). A comparative analysis of temperature, magnetic field, and performance demonstrates that the sample achieves the best AMR performance (0–1 T magnetic field, response temperature close to room temperature) compared to existing literatures. Additionally, significant magnetic anisotropy was observed, with the magnetic susceptibility anisotropy enhanced by a factor of three near the Curie temperature. Curie–Weiss fitting showed that films with optimal crystallinity exhibited significant differences between the in–plane and out–of–plane effective magnetic moments, while films with poorer crystallinity showed minimal differences, indicating that structural anisotropy underlies the anisotropy in magnetic properties.
研究领域:
材料科学
·
凝聚态物理
·
薄膜技术
·
磁阻效应
·
自旋电子学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Yuchen Xie,Chunling Liu,Yating Shen,Shaozheng Wang,Ping Yu,Yule Li,Qingming Chen,Hui Zhang
In this paper, the sol-gel technique is employed to synthesize polycrystalline La 0.67 Ca 0.33 MnO 3 (LCMO) ceramics, where methanol is chosen as the solvent. The crystal structure, morphology, as well as electrical and magnetoresistive properties were examined. Moreover, the effect of amount of the dispersant glycerol on the properties of LCMO ceramics is studied. X-ray diffraction (XRD) results showed that all samples crystallized in single phases with orthogonal perovskite structure ( pnma space group), without any detectable impurity phases. Results reveal that the grain size of LCMO ceramics exhibits an initial increase followed by a decrease, accompanied by a similar behavior in the temperature coefficient of resistance (TCR) and magnetoresistance (MR). When the volume ratio of glycerol and methanol reached 2 %, the grain size is determined to be 7.30 μm, with TCR value of 25.02 % K −1 at T= 263.2 K, and MR value recorded at 55.40 %. The study elucidates the influence of glycerol on LCMO polycrystalline ceramics and optimize the fabrication process, thereby improve the electric transport property and magnetoresistance.
研究领域:
材料科学
·
凝聚态物理
·
陶瓷材料
·
电学性能
·
磁学性能
✓ 已验证
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2025
·
IF 2.2
Yingjuan Li,Chao Wang,Hao Duan,Ziao Gong,Zhiyuan Yang,Qianxu Ye,Baokang Hou,Sheng’an Yang,Qingming Chen
Perovskite manganese oxides, as strongly correlated systems, exhibit a rich interplay of competing metallic and insulating phases that give rise to diverse physical properties, including anisotropic magnetoresistance (AMR), ferromagnetism, and ferroelectricity. This unique behavior has made these materials a subject of intense research in recent years. However, the practical application of manganese oxide-based AMR devices faces significant challenges, such as limited accuracy under low magnetic fields, operational temperatures far from room temperature, and a high preparation threshold, which collectively restrict their viability for angle sensor technologies. In this study, we fabricated La 0 . 6 7 Ca 0 . 3 3 MnO 3 (LCMO) films on four distinct substrates — LaAlO 3 (LAO), NdGaO 3 (NGO), (LaAlO 3 ) 0 . 3 (SrAlTaO 6 ) 0 . 7 (LSAT), and SrTiO 3 (STO) — using a sol–gel spin coating technique. The wet films were rapidly sintered at 1 1 0 0 ∘ C in a tubular furnace, yielding LCMO/LAO, LCMO/NGO, LCMO/LSAT, and LCMO/STO samples. We systematically investigated the impact of substrate choice on the structural, morphological, and magnetotransport properties of the films. Among the samples, the LCMO/LAO film demonstrated exceptional magnetoresistive performance, achieving a magnetoresistance (MR) of 63.6% at 273 K. Furthermore, by optimizing interfacial strain, we enhanced the AMR performance of LCMO/NGO films to − 28.7%. These findings not only advance the understanding of strain-mediated MR in perovskite manganites but also pave the way for the application of La 1 − x Ca x MnO 3 thin films in directional magnetic sensors, significantly broadening their potential for room–temperature device integration.
研究领域:
凝聚态物理
·
材料科学
·
磁性材料
·
薄膜技术
·
自旋电子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shaozheng Wang,Ruiting Hou,Lanlan Tian,Hui Zhang,Yule Li,Qingming Chen
La 0.67 Ca 0.33 MnO 3 (LCMO) ceramics exhibit high temperature coefficient of resistance (TCR) and colossal magnetoresistance effect (CMR). Increasing their TCR and MR values can enhance potential applications in uncooled infrared detectors and magnetic storage devices. However, presence of inherent grain boundaries and defects within these ceramics significantly limits their performance. Therefore, this work proposed modifying grain boundaries of LCMO ceramic using low-resistivity and stable Au to enhance its electrical transport and improve magnetoresistance performance through competition between antiferromagnetic Au and ferromagnetic La 0.67 Ca 0.33 MnO 3 . A series of La 0.67 Ca 0.33 MnO 3 : Au x ( x = 0, 0.05, 0.10, 0.15) composite ceramics was prepared by sol-gel and solid-state methods. Introduction of Au increased TCR from 40.1 %·K −1 to 55.2 %·K −1 and MR from 60.4 % to 74.2 %, when x = 0.10. This study demonstrates that proposed strategy involving multiphase interactions can significantly improve electrical transport and magnetic properties of functional materials , with promising applications in areas such as thermoelectric and magnetoelectric conversion.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Zifeng Li,Shuang Ding,Changchun Yu,Hao Yang,Xuting Sun,Hui Zhang,Qingming Chen,Yule Li
This study focuses on the improvement of magnetoresistance (MR) in a two-phase composite systems. The spin-polarization tunneling caused by the introduction of metal oxides (Fe 2 O 3 ) coating grains is a key link to enhance magnetoresistance performance. Two-phase composite ceramics La 0.67 Ca 0.33 MnO 3 @ x Fe 2 O 3 (LCMOF) (0 ≤ x ≤ 0.009) were prepared by sol-gel method, and the microstructure, electrical transport and magnetoresistance (MR) properties under the composite system were systematically studied. The XRD results indicate that the recombination of the second phase causes subtle structural distortion but still presents an orthogonal perovskite structure. The surface SEM results show that the grain boundaries of the material are clear, and the grain connections are tight. The coexistence of LCMOF and MnO phases exists in the sectional SEM images, which proves the occurrence of ion substitution. The ρ - T curve shows a drastic metal-insulator transition. The continuous recombination of Fe 2 O 3 increases the resistivity, which can be explained by the grain boundary effect and the dual-channel model. A noteworthy phenomenon was observed, when x = 0.009, the optimized MR was significantly enhanced to 72.94 %, and the sample performance was significantly improved, which was attributed to the spin-polarization tunneling effect. This study expands the application prospects of LCMOF composite phases in fields such as magnetic sensors, magnetic storage, and thermistors.
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DOI
高影响因子
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