JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2022
·
IF 3.097
Qingkai Yang,Haiqing Qin,Kailin Huang,Rui Zhang,Lu Yang,Zhao Lu,Qingrong Yao,Lichun Cheng,Caimin Huang,Qianxin Long,Jiang Wang,Huaiying Zhou
To investigate the magnetic and microwave absorption properties of PrFeO 3 ceramic, the traditional solid-state reaction and sol–gel methods were used. The results show that only an orthorhombic crystal structure was detected by X-ray diffraction and transmission electron microscopy. Interestingly, heat treatment can greatly improve the coercivity of PrFeO 3 ceramic and thus change the magnetic properties from antiferromagnetic to ferromagnetic. The high correlation between the magnetization parameters and bonding characteristics indicated that signifificant contracting of the Fe 3+ O c 2− bonds and decrease in Fe 3+ O d 2− Fe 3+ linkage angles were the main origins of the strong ferromagnetism in the PrFeO 3 ceramic. The PrFeO 3 sample prepared by sol–gel method has good reflection loss. When the simulated thickness is 2 mm, the reflection loss reaches −36.87 dB at 15.92 GHz. The preparation process of the sol–gel method is simple and can be used to synthesize single phase at low temperature, but it is only suitable for the synthesis and performance testing of single phase. The solid-state reation method can be used to determine the phase relationship and phase properties, but it requires high temperature and long annealing time. The experimental results show that the sol–gel method is more suitable for the study of material properties. These results demonstrate the potential application of PrFeO 3 ceramics in magnetic materials and microwave absorbing field.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
FERROELECTRICS
·
2019
·
IF 0.697
Peisong Tang,Xinyu Xie,Haifeng Chen,Chunyan Lv,Yangbin Ding
Perovskite rare-earth ferrate PrFeO3 is a new kind of photocatalytic material. Using Fe(NO3)3·9H2O, Pr(NO3)3·6H2O, citric acid and urea as main raw materials, the gel of PrFeO3 was prepared by sol–gel method. The gel was kept at 80 °C for 48 h to make xerogel. Then, the xerogel was calcined in muffle furnace at 800 °C to obtain PrFeO3 samples. The structure and morphology of samples were characterized by thermogravimetry and differential scanning calorimetry (TG-DSC), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and UV–visible diffuse reflectance spectroscopy (DRS). The results showed that the perovskite structure PrFeO3was obtained through sol–gel method. The resulting products have a particle size of 80 nm and an optical band gap of 2.4 eV. Consequently, the PrFeO3 nanoparticles showed high photocatalytic activities for decomposition of methyl orange under visible-light irradiation. The PrFeO3 samples are consistent with first-order kinetics for the degradation of methyl orange. And the apparent rate constants is k = 0.071 min−1.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Bei Wang,Weida Wang,Weidong Wu,Tingting Zhang,Changxiong Zou,Tan Wang
In this study, Ti 4 O 7 /PrFeO 3 particle electrodes were effectively synthesized through a sol-gel combined pyrolysis method and utilized as particle catalysts within an innovative 3D photo-electrochemical reactor (3D-PEC) to evaluate their efficacy in degrading yellow drugs present in mineral processing wastewater. The morphology, bonding characteristics, and crystalline phase composition of the Ti 4 O 7 /PrFeO 3 particle electrode were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The findings indicated that titanium suboxide was effectively integrated onto praseodymium ferrite, resulting in a Ti 4 O 7 /PrFeO 3 particle electrode exhibiting a hierarchical pore structure, substantial dimensions, reduced photoluminescence (PL) intensity, a wealth of active sites, and enhanced photoelectrocatalytic efficiency. At a dosage of 0.25 g/L, with an initial concentration of 50 mg/L, a starting pH of 7, an electrolyte concentration of 0.2 mol/L, a light intensity of 0.68 × 10 5 lux, and a 3 cm electrode distance. the degradation rate of the yellow drug achieved 98.90%, and the removal of COD and TOC reached 85.45% and 81.63%, respectively. The experimental findings indicate that the Ti 4 O 7 /PrFeO 3 particle electrode has good stability, exhibits excellent photoelectrocatalytic performance, and efficiently degrades wastewater containing the yellow drug.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xinxi Zeng,Fanzhao Zhang,Xiaoqing Xi,Han Zhang,Bingcheng Luo,Pengfei Zhu,Guowu Li,Bo Li,Ji Zhou
Ferrites are widely used in the preparation of basic components that function within the microwave band. Compared with ferromagnetic ferrites, which possess a weak internal anisotropy field so that the working frequency of ferrite ceramics cannot be increased into the terahertz band, antiferromagnetic rare earth orthoferrites undergo strong interactions on the order of 100 T so that terahertz (THz) resonances can be supported. However, the zero or near-zero magnetization and internal dipolar fields complicate the manipulation of the THz responses in antiferromagnets using the traditional magnetic method. In this article, we choose PrFeO 3 as a model of rare earth orthoferrites and report a method of cooling and thickening to tune the THz resonances and absorptions. A combination of tuned time- and frequency-domain spectroscopic responses, including variations in amplitude with the time delay, changes in the transmittance, the peak height, the extinction coefficient κ , dissipation factor tan δ , and absorption coefficient α , which varied with frequency, reveal that our approach is effective. In this work, the resonant frequency of ferrites is promoted to the THz band, providing a highly effective approach for exciting and tuning their resonances and absorptions and offering support for the application of ferrite ceramics in the field of terahertz devices.
研究领域:
材料科学
·
物理学
✓ 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）