Study On The Design And Properties Of Solid-Solid Crystal Phase Change Of Amine Salt Metal Halide

Multiple-switching bistable phase transition material is excellent candidates for important and thriving applications in electronics,optics,data storage and other information fields which is critical material in national development.This material can be a tremendous momentum pushing the country's development,including national defense,commercial-using and civil-using.At present,the industry has a series of problems,such as much pollution and high energy consumption.So we must study new-type bistable phase transition material.To compared with traditional phase transition material,the new-type bistable phase transition material,which is investigated by us,possess superior advantages:single crystals of large size,ability to fabricate flexible films,easy to realize the structure-properties modified regulation,energy-saving preparation and environmentally friendly processing.Based on special characteristics and excellent l properties,this project do much scientific research work which would promote this field development.In this paper,the synthesis of compound,the structure of single crystal,and the properties of phase transitions for amine based metal Cu?Cd?Mn?Sb were studied.The compounds of this thesis are divided into four groups.In the first group,three compounds whish are produced by the reaction between tris?2-aminoethyl?amine and different metals[N?NH₂CH₂CH₂?₃]₂Mn₂Cl₁₂?1?,N?NH₃CH₂CH₂?₃Cd₃Cl₉?H₂O?2?,N?NH₃CH₂CH₂?₃CuBr₅?3?do some work.The compound 1 is large-size crystal which exhibits intriguing temperature-dependent dielectric and red emission switchable characteristics.Simultaneously,the dielectric measurement shows anisotropy along different crystallographic directions.This material perfectly explains the advantages of molecular materials,while 1 can also be used to fabricate a transparent unidirectional film with ultraflexibility and controlled by optical,thermal and electric signals.The compound 2 and 3 do not possess reversible phase transition by the investigated of crystal structure and dielectric properties.In section two,we introduced the compounds(N₂C₄H₁₄)₂Cd₃Cl₁₀?4?,(N₂C₄H₁₄)CdBr₄?5?and?N₂C₃H₆?₂Sb₂Cl₈?2H₂O?6?.By evaporation of the reaction mixture solution,the compound 4,5,6 resulted in colorless block crystals.These results indicate that the three compounds do not possess expected reversible phase transition through a series of analysis of crystal structure and dielectric properties.In section three,we study the compounds?C₅H₅NH?₂CdI₄?H₂O?7?and N₂H₂?CH₂CH₂?₃CdI₄?H₂O?8?,N₈C₅₆H₂₄O₈Cd₈I₂₄?9?,(C₆H₁₀N₂)CdI₄?2H₂O?10?,(NC₇H₁₀)MnCl₃?2H₂O?11?which are synthesized by metal halide and amine.It is found that the compounds can generate the bulk single crystals successfully.These results indicate that the five compounds do not possess expected reversible phase transition through a series of analysis of crystal structure and dielectric properties.In summary,we have successfully synthesized the compound 1 which can control by optical,thermal and electric signals.Our work achieved the objective of finding the material.To confirm the phase purity of the synthesized complexes,the IR spectra and the powder X-ray diffraction?PXRD?patterns were recorded,which agreed very well with the simulated ones in terms of the crystal structures.