rare earth compounds
In nanotechnology, if the inorganic nano-crystals with designed composition and crystal structure, can display a lot depends on the size and shape of the performance. In recent years, rare earth compounds, nano-materials are widely used in optical, electrical and magnetic fields, so the nano-materials are also cause for concern.
Because some of the potential application of nano-materials, synthesis of novel nanostructures of rare earth compounds, exploring the growth process, and thus achieve the size, structure and nature of the regulation, structure and properties of the in-depth study of the dependence, the development of new applications of rare earth compounds, ultimately in accordance with the will of the people to design synthetic materials is of great significance. In this paper, the new structure from the materials and starting to explore new methods, through a series of hydrothermal synthesis of nano materials, rare earth compounds, rare earth compounds to achieve the controlled synthesis of nanomaterials. Details are as follows:
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(1) paper assistive technologies using organic complexing agent to sodium citrate as complexing agent, the use of hydrothermal synthesis of monodisperse hexagonal prismatic YPO4 · 0.8H2O nanocrystals. The typical growth process of the sample were explored, while the morphology of YPO4 · 0.8H2O were discussed a number of factors, such as reaction time, complex agent / Y3 +, temperature, etc.; change of rare earth precursor, synthesis of other series of rare earth phosphate nano-crystals of salt compounds, such as] LnPO4 · xH2O (Ln = Eu, Tb, Dy, Er), found that morphology of rare earth phosphate compounds of rare earth ions and complexing agents mainly by the interaction of the decision, the crystal can be adjusted with different complexing agent growth rate of the crystal face; In addition, prepared by the method of Eu3 + doped nanocrystalline YPO4 · 0.8H2O, and its luminescent properties were studied.
(2) complexing agent assistive technologies based on synthetic materials to control the application of multi-level structure, this paper was assisted organic complexing agent, rare earth nitrate compounds by a simple hydrothermal reaction of sodium fluoride and different multi-level structure of rare-earth fluoride compounds LnF3 (Ln = Y, La, Ce, Eu, Tb, Dy, Ho, Er) nano-materials, such as spindle-shaped nano-, nano-and nano-particles such as peanuts. The results show that: reaction time, molar ratio of rare earth ions and complexing agents, complexing agent and rare earth precursor, and other types of factors are assembled on the structure of rare earth fluorides has an important influence.
(3) Synthesis of people Ce02 has a strong interest in many areas because of its potential value, the paper was synthesized by solvothermal cerium dioxide hollow microspheres, such as nano-octahedral CeO2 materials with different morphologies. Specific content is based on the grain nucleation and growth process of the knowledge base is proposed sources without solvothermal synthesis. The results show that the amount of ethanol added, PVP added, reaction time on the morphology of implications. In addition, the growth mechanism was studied, and Eu3 +: CeO2 luminescent properties were studied.
