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Wang L.,Central South University | Wang L.,Guilin University of Electronic Technology | Rao G.H.,Guilin University of Electronic Technology | Zhang X.,Guilin University of Electronic Technology | And 3 more authors.
Ceramics International | Year: 2016

Reversals of magnetization and exchange bias field were observed in polycrystalline perovskite TmCrO3. Interestingly, the sign reversal of exchange bias can be driven by both temperature and cooling field. The temperature dependence of exchange bias reversal takes place around 31 K and the sign reversal of exchange bias driven by cooling field occurs when the system exhibits positive exchange bias. The reversals can be elucidated based on the antiferromagnetic coupling between the canted Cr3+ moments and Tm3+ moments. This antiferromagnetic coupling will hinder or benefit the reversal of Cr3+ moments or Tm3+ moments when the system were cooled under different magnetic field. © 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source


Wang L.,Central South University | Wang L.,Guilin University of Electronic Technology | Wang S.W.,Guilin University of Electronic Technology | Zhang X.,Guilin University of Electronic Technology | And 3 more authors.
Journal of Alloys and Compounds | Year: 2016

Reversals of magnetization and exchange bias field were observed around 19 K in polycrystalline perovskite chromite YbCrO3. Both the reversals can be elucidated based on the antiferromagnetic interaction between the ferromagnetic component of Cr3+ moments and the Yb3+ moments. The low field magnetization exhibits a perfect linear correlation with the magnetization shift resulted from the exchange bias effect. Distinguished from other exchange bias systems, the dependence of HE at 10 K on the cooling field shows an almost undamped feature up to 85 kOe, indicating the stable exchange bias states in respective temperature region. © 2015 Elsevier B.V. All rights reserved. Source


Zhang L.,Guangxi Key Laboratory of Superhard Materials | Zhang L.,National Engineering Research Center for Special Mineral Materials of China | Lin F.,Guangxi Key Laboratory of Superhard Materials | Lin F.,National Engineering Research Center for Special Mineral Materials of China | And 11 more authors.
International Journal of Refractory Metals and Hard Materials | Year: 2015

Cubic boron nitride (cBN) composites, using Al and HfC as the additives, were sintered under static high pressure of 5.0 GPa and at temperatures of 700 °C-1500 °C for 80 s. By analyzing the phase components of the sintered samples through the X-ray diffraction (XRD) analysis, we found that when the temperature increased from 700 °C to 900 °C, cBN reacted with Al and HfC, and produced AlN, AlB2, HfB2 and B2C5N2. Above 1000 °C, AlB2 was not stable. It decomposed and finally generated AlB12. At the meantime, the content of AlN, AlB12, HfB2 and B2C5N2 increased with Al disappearing. The Vickers hardness of the sintered samples increased with increasing the cBN content. The SEM and the abrasion ratio tests revealed that the well-sintered samples with homogeneous microstructure and the best wear resistance could be obtained at 5.0 GPa, 1300 °C for 80 s with the cBN content of 80 wt.%. © 2015 Elsevier Ltd. Source


Liu Z.-H.,Guangxi Key Laboratory of Superhard Materials | Liu Z.-H.,Chinese National Engineering Research Center for Special Mineral Materials | Liu Z.-H.,China Nonferrous Metal Guilin Geology and Mining Co. | Luo W.-L.,China Nonferrous Metal Guilin Geology and Mining Co. | And 6 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2013

The single diamond grit loading experiments on photovoltaic materials namely monocrystalline silicon, polycrystalline silicon and sapphire are done by micro-hardness method. Loading characteristics with single diamond grit to these materials under different force are studied, and the relationship between the force and the loading deepness is analyzed. According to the test results, the diamond's force state and these materials' carving models are analyzed when these materials are cut by diamond tool. Source


Xie D.-L.,Hunan University | Wan L.,Hunan University | Ning C.-X.,China Nonferrous Metal Guilin Geology and Mining Co. | Ning C.-X.,Chinese National Engineering Research Center for Special Mineral Materials | And 13 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

Fe based prealloyed powders were manufactured by co-precipitation method. The mechanical properties of samples sintered at different temperatures were tested. Alloy's structure formed during co-precipitation process was studied by XRD and the morphology was observed by SEM. The results show that the sintering temperature should be less than 900℃ and the mechanical properties of the alloys are the best when sintered at 850℃. The samples sintered at 850℃ have the uniform grain size and best mechanical retention of matrix applied to diamond. ©, 2015, Chinese Ceramic Society. All right reserved. Source

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