We report experimental studies on the formation of Type 2 micropipe defects in 4H–SiC crystals grown by a physical vapor transport method. Compared with Type 1 micropipes, Type 2 micropipes exhibit new features allowing them to lie at an oblique angle about 12° to the [0001] crystal axis and are smaller in size than Type 1 micropipes. By changing the growth conditions, we find that a smaller axial temperature gradient and a larger grain size in the SiC source are beneficial to eliminate the Type 2 micropipes. We think that the liquid silicon is responsible for the formation of Type 2 micropipes. A possible formation mechanism for Type 2 micropipes is put forward.

10.1039/c2ce26329g

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Removal of residual benzohydroxamic acid-lead complex from mineral processing wastewater by metal ion combined with gangue minerals

Journal of Cleaner Production (2023)

Xiangsong Meng Min Jiang Shangyong Lin Zhiyong Gao Haisheng Han

Gangue

Mineral processing

10.1016/j.jclepro.2023.136578

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Citations (17)

Enhanced flocculation and sedimentation of copper tailings by polycarboxylate ether superplasticizer

Separation and Purification Technology (2023)

Yingdi Dong Zhongbao Hua Qiancheng Zhang Zeng Hua Tong Yue

Settling

Sedimentation

Dewatering

10.1016/j.seppur.2023.123696

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Citations (8)

Evaluation of Mineralogical Characteristics and Flowsheet Improvements for Carbon-Bearing Lead-Zinc Ore

JOM (2024)

Zhongbao Hua Bin Shi Yingdi Dong Yixin Fu Yong Zeng

Lead (geology)

Carbon fibers

Mineral processing

10.1007/s11837-024-07029-9

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Regeneration of LiFePO4 from spent materials: control and influence of Al impurity

ChemSusChem (2024)

Shaole Song Runqing Liu Jiexiang Li Wei Sun Yue Yang

Owing to the rapid increase of lithium iron phosphate (LiFePO4) batteries, recycling and regeneration of LiFePO4 enjoys significances for sustainable development and environmental protection. In this study, an effective regeneration method for spent LiFePO4 materials and the influence of Al impurity on the electrochemical performance of regenerated LiFePO4 were studied. Firstly, 99.26% Fe, 99.52% P, 99.58% Li, 59.36% Al and 20.24% Cu in spent LiFePO4 material were leached with 150 g•L‐1 H2SO4. Subsequently, Al removal and control were achieved by simply adjusting the pH value, and FePO4•2H2O precursors with different Al contents were prepared. Specially, the LiFePO4 regenerated by FePO4•2H2O precursor containing 0.096% Al exhibits excellent electrochemical performance with discharge capacity of 145 mAh•g‐1, 140.5 mAh•g‐1 and 130.9 mAh•g‐1 at the current density of 1C, 2C and 5C, respectively.

Lithium iron phosphate

Iron phosphate

10.1002/cssc.202401432

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