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Integrated purification of gadolinium and preparation of Gd2O_(3) nanoparticles by dc arc plasma

Journal of Rare Earths 2021年第12期39卷 1574-1578,I0005页

作者： Zhenggang Tang Minjie Hou Xin He Kai Ye Da Zhang Zhipeng Xie Yongnian Dai Feng Liang The National Engineering Laboratory for Vacuum Metallurgy Kunming University of Science and TechnologyKunming 650093China Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province Kunming University of Science and TechnologyKunming 650201China Institute of Physical Education Yunnan Agriculture University State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization Kunming University of Science and TechnologyKunming 650093.China

The rare-earth metal Gd plays an important role in the energy,information,and national defence fields due to its special optical,electrical,magnetic,and catalytic *** this study,Gd was purified by direct current(dc)arc plasma,and Gd2O_(3) nanoparticles were prepared via an integration method using purified *** effects of arc current,melting time,gas pressure,and atmosphere on the purification of Gd by dc arc plasma were *** an increase in the arc current and melting time,the rate of removal of impurities from Gd ***,Gd melting was conducted by H_(2)-Ar arc plasma,which improves the impurity removal rate by increasing the H_(2) *** thermal conductivity and chemical activity of the activated H atoms generated by the dissociation of H_(2) are the main reasons for the significant improvement in the impurity removal *** mechanism of Gd purification was analysed based on the above-mentioned experimental *** as-synthesised Gd2 O_(3) nanoparticles have a uniform spherical structure(average diameter of 32.7 nm),appropriate dispersibility,and high *** study provides a new strategy for the integrated purification of metals and preparation of metal/metal-based nanomaterials by dc arc plasma.

关键词： Gd dc arc plasma Purification Preparation Nanomaterial Integration

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Synthesis and properties of nanostructured materials by dc arc and RF plasma

Synthesis and properties of nanostructured materials by DC a...

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The 9th Asia-Pacific Conference on plasma Science and Technology and 21st Symposium on plasma Science for Materials

作者： Jie Zheng~1,Lei Xie,Xubo Song~1,Rong Yang~1 and Xingguo Li~(1,2*) 1 The State Key Lab.of Rare Earth Mater.Chem.and Applications,College of Chemistry,Peking University,Beijing 100871,PR China 2 Advanced Materials and Nanotechnology,College of Engineering Peking University,Beijing 100871,PR China

Nanostructured materials have been an important subject in research since the late *** are many methods developed for synthesis of nanoparticles such as ball-milling,precipitation,hydrothermal method,chemical vapor deposition and so on. Different from conventional methods,we have been studying synthesis of metallic, semiconductive and ceramic nanomaterials by dc arc and RF plasma methods. Recently we investigated synthesis and properties of nanostructured hydrogen storage materials and silicon oxynitrides by hydrogen plasma metal reaction(HPMR) and RF cold plasma,*** HPMR,we synthesized nanostructured Mg and Li-based hydrides and investigated their hydrogen storage *** results show that nanoparticles or hollow nanospheres can be prepared by HPMR and they have superior hydrogen absorption and desorption properties due to their small size and large specific surface *** other hand,by NH RF cold plasma,nanowires of amorphous silicon oxynitrides(a-SiON) were successfully *** results show that both the active hydrogen and nitrogen species generated in the NH plasma were essential for a-SiOxNy nanowire formation:the former one kept the activity of the catalyst while the later one ensured efficient nitrogen *** this talk,I will present our results in these areas.

关键词： Synthesis of nanomaterials dc arc plasma RF plasma Characterization Physical and chemical properties

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Preparation and hydrogen storage properties of ultrafine pure Mg and Mg-Ti particles

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Transactions of Nonferrous Metals Society of China 2012年第8期22卷 1849-1854页

作者：李镇华邹建新曾小勤孙海全丁文江上海交通大学上海市镁材料及应用工程中心轻合金精密成型国家工程中心上海200240 上海交通大学材料科学与工程学院金属基复合材料国家重点实验室上海200240

The ultrafine pure Mg and Mg-Ti particles were prepared through a direct current （dc） arc plasma method. The X-ray diffraction （XRD）, transmission electron microscopy （TEM）, pressure-composition-temperature （PCT） method and TG/DTA techniques were used to study the phase components, microstructure and hydrogen sorption properties of the powders before and after hydrogen absorption. It is revealed that most of the ultrafine Mg and Mg-Ti particles are hexagonal in shape with particle size in the range of 50-700 nm. According to the Van’t Hoff equation, the hydrogenation enthalpy of Mg-Ti powders is determined to be about -67 kJ/mol H2 based on the PCT curves of hydrogen absorption plateau pressures. This value is much higher than -78.6 kJ/mol H2 for pure Mg powders. TG/DTA analyses show that the onset dehydriding temperature of hydrogenated Mg-Ti powders is 386 °C, which is significantly lower than that of the hydrogenated Mg （423 °C）. The results prove that the addition of Ti into Mg through arc evaporation method can improve the thermodynamic properties of Mg for hydrogen storage.

关键词： Mg Mg-Ti dc arc plasma ultrafine particles hydrogen storage

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