水溶液电沉积稀土合金薄膜的研究

【作者】 唐黎明；

【导师】 王玲玲；

【作者基本信息】 湖南大学 ， 材料物理与化学， 2003， 硕士

【摘要】 稀土薄膜已广泛地应用在磁学、光学、电催化、和超导器件等领域。这类稀土薄膜功能材料已引起了材料工作者的广泛关注。 本文首先综述了稀土合金薄膜的制备、性质和应用，分析了水溶液电沉积稀土合金的可能性及实现途径。 其次，本文对水溶液电沉积Ni-Nd-P、Ni-Ce-P和Fe-Nd-Ni-P稀土合金薄膜进行了研究。成功地在Cu基体上电沉积出厚度达5μm以上的灰白色的稀土合金薄膜。研究发现：柠檬配体和Cu基体能使稀土元素的还原电位正移，使稀土元素电沉积成为可能。本文对电沉积Ni-Nd-P时，金属盐浓度和工艺条件对镀层成分及镀层形貌的影响进行了重点研究。得出了能实现Ni、Nd、P三种元素共沉积且镀层稀土元素Nd含量高、镀层质量好的金属盐浓度和工艺条件。 在此基础上，本文对稀土合金镀层的力学、热学和磁性能进行了研究。通过测试镀层的显微硬度和杨氏模量发现：镀层的硬度值较低、应力很大。采用差动热分析法研究了镀层的热稳定性并结合镀层的结构分析发现：此类合金是热稳定性较好的非晶材料。测试Ni-Nd-P合金的磁性发现：合金的磁性能不好，但比不含稀土的Ni-P的磁性能要好，并且合金的磁性能随热处理温度的上升而提高。更多还原

【Abstract】 Thin films of rare earths have been applied widely in magnetic, optical, electrolytic and superconductor devices, and aroused many material researchers’ interests.In this paper, the preparation, properties and application of rare earth films are summarized. Possibilities for electrodeposition of rare earth metals and their alloys from aqueous solution are discussed.The white-gray films with a thickness up to 5m of Ni-Nd-P, Ni-Ce-P and Fe-Nd-Ni-P alloys were successfully prepared on copper substrate by electrodeposition from aqueous bath. The reduction potential of rare earth shifted positively due to the complex formation (formed with citric acid) and the copper substrate, which made rare earth alloy films deposition possible. Emphasis was imposed on the effect of concentration of metal salts and doposition conditions on the components and morphologies of Ni-Nd-P. Proper concentration of metal salts and doposition conditions were obtained for the realization of the codeposition of Ni, Nd and P, and the alloys are of high Nd content and fine quality.In addition, mechanical, thermal and magnetic of the rare earth films were investigated in this paper. The result of the micro-hardness and Young’s modulus of films show that the rare earth films have low hardness and great stress. Analysis of the microstructure and DTA show that these rare earth alloys are good amorphous materials with great thermo-stability. Magnetic measurements show that these alloys have poor magnetic properties, which are higher than those of the rare earth-free Ni-P alloys, and increase with the increase of the heat treatment temperature.更多还原