Influence of synthesis methods and calcination temperature on electrical properties of La1−xCaxMnO3 (x=0.33 and 0.28) ceramics

Ma, Ji; Theingi, Mya; Chen, Qingming; Wang, Wenzhang; Liu, Xiang; Zhang, Hui

doi:10.1016/j.ceramint.2013.03.044

Cited by 41 publications

(7 citation statements)

References 26 publications

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“…Thus, the polycrystalline La 0.67-Ca 0.33 MnO 3 with high TCR value has the potential to be used in the room temperature bolometer. It has already been demonstrated that the synthesis method, sintering process and ion doping (e.g., Ag) can significantly change the electrical properties and transport behavior of manganites [17][18][19]. Currently, several synthesis methods including sol-gel, co-precipitation and solid-state reaction are used to prepare the LCMO ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, several synthesis methods including sol-gel, co-precipitation and solid-state reaction are used to prepare the LCMO ceramic materials. Compared with other synthesis methods, the sol-gel method can produce nanoscale powers with better chemical uniformity and desired stoichiometry [18][19][20]. For this reason, sol-gel method and different sintering process are investigated in our research for the La 0.67 Ca 0.33 MnO 3 material to enhance the electrical properties especially the TCR value.…”

Section: Introductionmentioning

confidence: 99%

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Search for high temperature coefficient of resistance La2/3Ca1/3MnO3 polycrystalline ceramics

Cai

Cui

et al. 2014

Appl. Phys. A

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La 2/3 Ca 1/3 MnO 3 polycrystalline ceramics were synthesized by sol-gel method. Sharp temperature coefficient of resistance (TCR) variation (with peak value up to 22 %) has been observed near the metal-insulator transition temperature T MI (273 K) for the sample sintered at 1,450°C. This TCR value is much higher than the previously reported values for the undoped and Ag-doped La 0.67 Ca 0.33 MnO 3 samples and is comparable to the optimized thin films. It was concluded that the improved physical properties of the La 0.67 Ca 0.33 MnO 3 material are due to its improved microstructure and homogeneity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Search for high temperature coefficient of resistance La2/3Ca1/3MnO3 polycrystalline ceramics

Cai

Cui

et al. 2014

Appl. Phys. A

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“…As a catalyst, the catalytic activity and stability are prerequisite, strongly relating to its morphology, particle size distribution, and crystallinity, which are determined by the preparation method adopted [9]. Traditionally, the preparation method (e.g., sol-gel [10], citrate complexation [11], solid-state reaction [12], co-precipitation [13]) involve in high-temperature solid-state reactions, leading to the destruction of pore structures and hence to low surface areas (\25 m 2 /g). That would greatly hinder their practical applications in heterogeneous catalysis.…”

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confidence: 99%

A modified sol–gel method for low-temperature synthesis of homogeneous nanoporous La1−x Sr x MnO3 with large specific surface area

Zhuang

Liu

Zeng

et al. 2015

J Sol-Gel Sci Technol

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A modified sol-gel (MSG) method was developed to synthesize perovskite La 1-x Sr x MnO 3 (x = 0.2, 0.4, 0.6, 0.8) with large specific surface area that allows for control of their particle size from the micrometer level to the nanometer level with novel nanoporous structure. The MSG method utilized carbon black (Vulcan XC-72R) as a poreforming material during the preparation process. Two important process parameters, the calcination temperature and the pore former material addition, were investigated to control the size of the La 1-x Sr x MnO 3 particles. The phase evolution of La 1-x Sr x MnO 3 powders was investigated by thermogravimetric analysis (TG/DSC) and X-ray diffraction pattern. The results showed that the pure La 0.6 Sr 0.4 MnO 3 phase has been obtained at about 550°C in air, which is lowered around 150°C comparing to conventional sol-gel method. In scanning electron microscope studied, it presented novel homogeneous nanoporous morphology with the average particle size from 30 to 100 nm. Based on the Brunauer-Emmett-Teller method analysis, the specific surface area of La 1-x Sr x MnO 3 was significantly influenced by the calcination temperature, the pore former material addition and the strontium content. The largest specific surface area of La 0.2 Sr 0.8 MnO 3 reached 114.3 m 2 /g. Graphical abstract

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“…TCR is usually related to the strong scattering effect that is determined by the lattice vibration, crystallinity, and carrier concentration of ceramics. 47 The effect will block the transportation of electrons and result in a decrease in total conductivity and TCR. A value of 1267 ppm/ • C could be achieved for the sample of x = 0.05 sintered at 1200 • C, which is smaller than that of standard metal conductors (Ag, ≈3800 ppm/ • C), indicating that it has the potential for the functional phase of TFRs.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Zn‐substituted La_0.5Sr_0.5CoO₃ ceramics as functional materials for thick‐film resistors

Peng

et al. 2021

J Am Ceram Soc.

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This work focuses on the evaluation of La 0.5 Sr 0.5 Co 1-x Zn x O 3 (LSCZ, x = 0.00-0.10) ceramics as an air-fireable and economical functional material for thick film resistors. Solid-state reaction experiments and first-principles calculations were conducted to investigate the crystal structure, thermal behaviors, and electrical properties of LSCZ ceramics. The substitution of Zn 2+ modified the bond properties, electron distribution, and band structure, resulting in more serious structural deformation, increasing the bond population of Co-O and weakening the charge transfer of LSCZ. Experimental results showed that the addition of Zn 2+ lowered the densification temperature, activation energy, and crystallite size. As the ratio of Zn 2+ increased, the conductivity and temperature coefficient of resistance showed a downward trend. Impedance variation with frequency and thermal aging tests were also performed. For the x = 0.05 specimen sintered at 1200 • C, values of 95.5% for relative density, 2857 S/cm for conductivity, 1267 ppm/ • C for temperature coefficient of resistance, -0.47% for conductivity change could be achieved.

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Influence of synthesis methods and calcination temperature on electrical properties of La1−xCaxMnO3 (x=0.33 and 0.28) ceramics

Cited by 41 publications

References 26 publications

Search for high temperature coefficient of resistance La2/3Ca1/3MnO3 polycrystalline ceramics

Search for high temperature coefficient of resistance La2/3Ca1/3MnO3 polycrystalline ceramics

A modified sol–gel method for low-temperature synthesis of homogeneous nanoporous La1−x Sr x MnO3 with large specific surface area

Evaluation of Zn‐substituted La_0.5Sr_0.5CoO₃ ceramics as functional materials for thick‐film resistors

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Influence of synthesis methods and calcination temperature on electrical properties of La1−xCaxMnO3 (x=0.33 and 0.28) ceramics

Cited by 41 publications

References 26 publications

Search for high temperature coefficient of resistance La2/3Ca1/3MnO3 polycrystalline ceramics

Search for high temperature coefficient of resistance La2/3Ca1/3MnO3 polycrystalline ceramics

A modified sol–gel method for low-temperature synthesis of homogeneous nanoporous La1−x Sr x MnO3 with large specific surface area

Evaluation of Zn‐substituted La0.5Sr0.5CoO3 ceramics as functional materials for thick‐film resistors

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Evaluation of Zn‐substituted La_0.5Sr_0.5CoO₃ ceramics as functional materials for thick‐film resistors