JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 10
·9983-9988
·
IF 2.195
Ma Panfei,Zhang Huimin,Chen Mingxing,Liu Ting,Chang Aimin,Su Zhi
Highly dense LaCrO 3 negative temperature coefficient (NTC) thermistor ceramics by low-heating solid-state method have been successfully synthesized in air ambient. The X-ray diffraction analysis has shown that both of the calcined powders and as-sintered ceramics crystallize in a perovskite structure. The relative densities of the ceramics synthesized by Cr(NO 3 ) 3 ·9H 2 O and the ceramics synthesized by CrCl 3 ·6H 2 O are 91% and 65%, respectively. The relationship between lnρ and 1000/T shows an approximate line in the measured temperature range. The values of ρ 25 and B 0/25 of the ceramics synthesized by Cr(NO 3 ) 3 ·9H 2 O and the ceramics synthesized by CrCl 3 ·6H 2 O are 424.8 Ω cm, 3252 K and 1835.9 Ω cm, 3636 K, respectively.
研究领域:
材料科学
·
无机非金属材料
·
电子陶瓷
·
热敏材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 16
·5336-5344
·
IF 4
Lijun He,Jia Yang,Wenbin Guo,Yan Li,Alberto J. Fernández-Carrión,Xiaojun Kuang
A controlled chemical reduction process was performed on LaCrO3 assisted by CaH2 at a relatively low temperature (773 K), and the impact on the photocatalytic and magnetic properties is discussed. The reduction process leads to the formation of oxygen vacancies that enhance photocatalytic properties by acting as traps that retard the hole/electron recombination processes. In addition, the existence of oxygen defects induces some subtle structural modifications, resulting in Cr–O–Cr angle variation that influences the magnetic behavior of the material. Therefore, the use of a controlled chemical reduction process is an effective method for tunning the physical–chemical properties of transition-metal oxide-based materials, even in cases with high chemical stability.
研究领域:
材料化学
·
光催化
·
固体化学
·
功能材料
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Ming Li,Lili Guan,Yunshuo Zhu,Yanrui Shi,Yarong Huang,Xiwen Song
The phase formation and densification of LaCrO 3 were successfully achieved through AC reactive flash sintering (AC-RFS) in one step at a constant temperature of 600°C, using La 2 O 3 and Cr 2 O 3 as raw materials. The current density curve ‘buffer region’ was discovered under different electric field strengths. The ‘buffer region’ corresponds to the phase transformation from the intermediate phase La 2 CrO 6 to the target product LaCrO 3 . Joule heating and a high heating rate resulted in nearly full densification of the LaCrO 3 ceramic central region sintered for 1 second at maximum current density. In particular, the behavior of LaCrO 3 was analyzed, and the phase transformation completion point was evaluated based on the RFS behavior without the need for complex testing methods. The discovery of the ‘buffer region’ provides experimental guidance for determining the phase transformation completion points of various other materials in RFS experiments.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yunfei Wang,Hao Sun,Yafei Liu,Ruifeng Wu,Lili Zhi,Aimin Chang,Bo Zhang
Lanthanum chromite (LaCrO 3 ) based perovskites are crucial in advanced electronics for their stability, but efforts to enhance their density and structural stability remain vastly lacking. Here, we introduced high-entropy concept to enhance the microstructure and electrical properties of LaCrO 3 for thermistor applications. The obtained La(Cr 0.2 Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 )O 3- δ and (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Y 0.2 )(Cr 0.2 Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 )O 3- δ ceramics showed high relative densities of up to 89.48 % and 99.57 %, respectively. The shear strain due to significant lattice distortions caused by differences in elemental size, mass and electronegativity increased resistivity through enhancing phonon scattering. Meanwhile, this strain effect and native defects changed the charge conduction mode, thus resulting in a significant linearity at critical temperatures exceeding 163 K. Our results reveal that the high-entropy enhances the performance of LaCrO 3 materials for thermistor applications, especially in terms of improving the ceramic density, reducing the resistivity and enhancing the temperature sensing accuracy. This high-entropy approach is expected to be widely applicable for the development of high-performance low-temperature thermistors.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Dayan Xie,Kuibao Zhang,Weiwei Li,Baozhu Luo,Haibin Zhang
Lanthanum chromite (LaCrO 3 ) is a promising functional material because of its high melting point, high thermal conductivity and excellent fire resistance. In this study, LaCrO 3 was successfully prepared by self-propagating high-temperature synthesis (SHS) method using CrO 3 and Cr as the oxidant and reductant. The optimum mole ratio of La 2 O 3 , Cr and CrO 3 was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The result shows that the LaCrO 3 powder with acceptable purity and good morphology was obtained when Cr and CrO 3 are 10% excess over La 2 O 3 . The real temperature of SHS system reaction was recorded by paperless recorder. The particle size distribution of the SHS prepared LaCrO 3 powder demonstrates median diameter of 1040 nm according to laser particle size spectrometer.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Yunfei Wang,Hao Sun,Yafei Liu,Lili Zhi,Aimin Chang,Bo Zhang
Perovskite lanthanum chromate (LaCrO 3 ) has been widely investigated for applications as functional material, its properties can be finely tuned through doping. This study explores the effect of Al 3+ doping on the structure and electrical properties of La 0.9 Sr 0.1 Cr 1- x Al x O 3 ceramics. Our findings reveal that Al 3+ doping significantly influences the consistency of grain size and electrical transport properties of these ceramics. As x increases, the grain size decreases and obtains its minimum at x = 0.5. Compared to the undoped La 0.9 Sr 0.1 CrO 3 , Al 3+ doping significantly reduces the resistivity. For x = 0.3, the resistivity obtains its minimum 142.60 Ω cm at −75 °C, while the B -value is reduced to 405 K. These results demonstrate the potential of Al 3+ doping in enhancing the thermal sensing properties of LaCrO 3 ceramics and understanding of semiconductor behavior for electron device applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 32
·12389-12396
·
IF 5.7
Yunfei Wang,Hao Sun,Yang Zhou,Ruifeng Wu,Yafei Liu,Lili Zhi,Aimin Chang,Bo Zhang
LaCrO3-based ceramics are crucial for fabricating low temperature thermistors due to their unique physical and chemical properties. However, challenges such as nonlinear electrical behaviors (temperature dependence of the resistivity deviates from the Arrhenius equation), and insufficient stability limit their application in precise temperature sensing and control. Here, we propose a high entropy strategy to design novel thermistor ceramics (La0.2Nd0.2Sm0.2Gd0.2Y0.2)CrO3−δ, which results in a widening band gap and increasing lattice distortion. These modifications lead to a significant rise in resistivity and a good linear temperature dependence of the resistivity, along with a reduced thermal hysteresis effect. The results reveal that high entropy modification crucially contributes to the improved thermal and electrical performance of LaCrO3 ceramics due to pronounced lattice distortion and band gap expansion. This study underscores the significance of entropy induced microstructural modifications, thus establishing a novel paradigm for tailoring the electronic properties of LaCrO3-based ceramics and expanding the horizons of material science in thermal sensing technologies.
研究领域:
材料科学
·
热敏电阻技术
·
电子工程
✓ 已验证
DOI
高影响因子
SOLID STATE COMMUNICATIONS
·
2016
·
IF 1.458
Handong Jiao,Junxiang Wang,Jianbang Ge,Long Zhang,Hongmin Zhu,Shuqiang Jiao
Ru-doped lanthanum chromates (LaRu x Cr 1− x O 3 ) were prepared through a solid-state reaction method. The perovskite pellets with high bulk density over 98% were obtained using the as-prepared LaRu x Cr 1− x O 3 powders as starting materials by spark plasma sintering (SPS) process. The pellets performed high electrical conductivity , which increased with increasing of temperature and ruthenium content (0≤ x ≤0.10). The activation energy of lanthanum chromate was found to be decreased due to the ruthenium doping.
研究领域:
材料科学
·
陶瓷
·
电学性能
·
固态化学
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2023
·
IF 8.7
Qunwei Guo,Jiaqi Geng,Jiawen Pan,Bo Chi,Chunyan Xiong,Jian Pu
Liquid fuels like diesel, biodiesel , and alcohols can be utilized for onboard hydrogen production in auxiliary power systems by steam reforming , in which hydrogen productivity and carbon deposition are key issues. A-site deficient La 1-x Cr 0.95 Ru 0.05 O 3 catalysts are prepared using the Glycine-nitrate method and characterized by multiple techniques. The catalyst with 20 % A-site deficiency exhibits about 95 % fuel conversion and stable performance over a 100 h continuous test at 750 °C and a steam/carbon ratio of 3.0 using n-hexadecane. However, the catalyst with a 10 % deficiency shows fluctuating fuel conversion with higher ethylene and ethane contents. Catalyst performance is mainly determined by active oxygen. The activation of steam on oxygen vacancies and Cr ions with variable valences could produce surface-free oxygen and freely migrating lattice oxygen respectively, which can react with CH x intermediates to form CO and H 2 .
研究领域:
能源材料化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Lei Dai,Fan Wu,Dekai Meng,Weiwei Meng,Yuehua Li,Ling Wang
Flake-like La 2 CrO 6 /LaCrO 3 sensing electrodes (SEs) were synthesized via a one-pot molten-salt method (MSM) for impedancemetric NO 2 sensors based on yttria-stabilized zirconia (YSZ) electrolyte. The MSM-derived La 2 CrO 6 precursor underwent self-phase separation during high-temperature calcination, yielding a La 2 CrO 6 /LaCrO 3 composite SE with abundant heterointerfaces. Structural characterizations confirmed that the molten-salt-derived flakes provide a highly accessible surface and abundant La 2 CrO 6 /LaCrO 3 heterointerfaces after calcination, which effectively amplify the electrode/electrolyte interfacial electrochemical reactions toward NO 2 . Consequently, compared with single-phase LaCrO 3 , the La 2 CrO 6 /LaCrO 3 composite SE exhibits excellent sensitivity, which is attributed to the synergistic coupling effect in the sensing mechanism. La 2 CrO 6 provides strong adsorption sites, while LaCrO 3 ensures thermodynamic stability. By optimizing the temperature and time of the MSM reaction and the calcination parameters, the SE morphology and sensing performance were systematically improved. The optimal La 2 CrO 6 /LaCrO 3 sensing electrode, which was prepared by reacting at 500 °C for 1.5 h and then calcined at 800 °C, exhibited an outstanding sensitivity of 12.51 °/decade to NO 2 (25-700 ppm) at a working temperature of 400 °C. Additionally, the sensor exhibited superior repeatability, humidity resistance, and high anti-interference capabilities against various exhaust gases (H 2 , NH 3 , CH 4 , CO 2 , and NO). This work confirms that the molten salt method is a highly effective strategy for constructing high-performance composite sensing electrodes.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Tao Xia,Yifeng Han,Chuanhui Zhu,Zhongxiong Sun,Chongyang Yuan,Qi Cui,Jin-Guang Cheng,Wei Du,Wenting Li,Kui Xie,Keke Huang,Shouhua Feng,David Walker,Man-Rong Li
High-pressure heaters in large volume presses must reconcile potentially contradictory properties, and the whole high-pressure and high-temperature (HPHT) community has been engaged for years to seek a better heater. LaCrO3 (LCO)-based ceramic heaters have been widely applied in multianvil apparatus; however, their performance is far from satisfactory, motivating further research on the chemical optimization strategy and corresponding thermochemical mechanism. Here, we adopted a chemical-screening strategy and manufactured tubular heaters using the electrically, chemically, and mechanically optimized Sr–Cu codoped La0.9Sr0.1Cr0.8Cu0.2O3−δ (LSCCuO-9182). HPHT examinations of cylindrical LSCCuO-9182 heaters on Walker-type multianvil apparatuses demonstrated a small temperature gradient, robust thermochemical stability, and excellent compatibility with high-pressure assemblies below 2273 K and 10 GPa. Thermochemical mechanism analysis revealed that the temperature limitation of the LSCCuO-9182 heater was related to the autoredox process of the Cu dopant and Cr and the exchanging ionic migration of Cu and Mg between the LSCCuO-9182 heater and the MgO sleeve. Our combinatorial strategy coupled with thermochemical mechanism analysis makes the prioritization of contradictory objectives more rational, yields reliable LCO heaters, and sheds light on further improvement of the temperature limitation and thermochemical stability.
研究领域:
材料科学
·
化学
·
物理学
·
高压科学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
·
2020
·Vol. 18
·期 3
·684-696
·
IF 1.762
Zhengkun Cai,Minjin Jiang,Qianqian Guo,Xiaosong Jiang,Song Chen,Hongliang Sun
High-density chromium deficient calcium-doped lanthanum chromite-based ceramics (La 0.8 Ca 0.2 Cr 0.98 O 3 ) were prepared by hot pressing (HP) at different sintering pressures, and the highest density can reach 98.8%. The effects of sintering pressure on the microstructure, mechanical properties, and electrical conductivity of La 0.8 Ca 0.2 Cr 0.98 O 3 materials were studied. The experimental results show that HP can increase the density of lanthanum chromite-based ceramic materials and significantly inhibit the growth of grain size. As the sintering pressure increases, the strength and hardness gradually increase, but the fracture toughness decreases. When the sintering pressure is greater than 58 MPa, the presence of the second phase CaCr 2 O 4 can be detected in the XRD results of the sintered ceramics. The SEM results showed that CaCr 2 O 4 had two completely different morphologies in the sintered ceramics, and it was initially speculated that the possible causes were due to two different generation pathways. The electrical conductivity decreases with increasing sintering pressure, whereas the maximum electrical conductivity obtained is 18.61 S/cm in vacuum at 800°C for pressureless sintering ceramic.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）