A-site Doped Barium Titanate Nanotube Films Study On Preparation And Performance

Ferroelectric thin films are a type of functional thin film material that has been studied for several decades and have an important role in the historical research of ferroelectric materials.With the rapid development of microelectronics,optoelectronics and other industries,the requirements for the size of materials have become higher and higher,and the material has grown from large sizes to small sizes and nanometers.Therefore,the development of miniaturized ferroelectric thin films has become one of the current research hotspots.In this experiment,titanium dioxide nanotube films were formed by anodic oxidation of titanium sheets.Then,a titanium dioxide film was used as a template,and barium titanate-based nanotubes were prepared by hydrothermal reaction and different elements through the A-site impurity of barium titanate.film.The microstructure,phase composition,dielectric properties and ferroelectric properties of these samples with different elements were discussed and discussed.The Ba1-xLaxTiO3nanotubes thin films were prepared by adding different amounts of La at the A-site.The results showed that with the increase of the impurity content,the size of the nanotubes became smaller,the lattice constant became smaller,and the performance of the nanotube films was lower than that of the nanotubes.The doping is improved,the tube diameter is between 90 and 100 nm,the tube wall thickness is about 25 ?m;after annealing,the crystal grain size becomes larger,the tube diameter becomes about 85?95 nm,and the dielectric constant and iron The electrical properties are all increased.The maximum dielectric constant measured at room temperature at 1 kHz is 350,the dielectric loss is 0.18,the remanent polarization Pr is 0.10 ?C/cm2,and the coercive field Ec is 1.5 kV/cm2..The structure,surface morphology,and electrical properties of the Ce-doped were investigated.Single crystal cubic-structured Ba1-xCexTiO3 nanotube films were prepared by hydrothermal reaction under green and safe conditions.The nanotube diameters ranged from 80 to 90 nm.After annealing,polycrystalline Ba1-xCexTiO3 nanotube films were formed.The outer diameter of the tube is between 70?80 nm.The thickness of the tube wall is 25?30 nm.The dielectric constant at room temperature can reach 472 at a frequency of 1 kHz,the dielectric loss is 0.41,and the remanent polarization Pr is 0.3?C/cm2,the coercive field Ec is 7.5 kV/cm.A-serie of Ba1-xSrxTiO3 nanotube films were prepared by doping with different contents of alkaline-earth metal Sr.The cubic-phase nanotube films were prepared by hydrothermal method under a safe green condition.The diameters of nanotubes prepared at 70?80 nm were obtained.The film thickness can reach about 25 ?m.After annealing,a tetragonal Ba1-xSrxTiO3 nanotube film is prepared,the tube diameter becomes about 65?75 nm.At room temperature,the dielectric constant can reach 500 at a frequency of 1 kHz and the dielectric loss is relatively small at 0.14.The remanent polarization Pr was 20 ?C/cm2 and the coercive field Ec was 12.5 kV/cm2.In the barium titanate film,the position of the germanium element in the crystal is replaced by the A-site doped La,Ce,and Sr elements,thereby improving the dielectric properties and ferroelectric properties of the material...