Tham khảo tài liệu 'ferroelectrics material aspects part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 200 Ferroelectrics - Material Aspects about 300 nC cm2 for the higher doping concentration FLC BaTiOa These calculated values are much higher than the experimental value of 65 nC cm2. One possible explanation for the discrepancy is that when the interactions between particles were ignored the larger size of the nanoparticles than the liquid crystal molecules led to disruption of the FLC stacking resulting in a smaller ps value than expected. Fig. 6. The dependence of the spontaneous polarization for FLC with different doping concentrations of BaTiOa suspensions on the applied voltage at 35 c Fig. 7. The dependence of the dielectric constant e1 for FLC with different doping concentrations of BaTiOg suspensions on the temperature at 1 kHz. Figure 7 shows the relationship between the permittivity and the temperature of the pure FLC FLC BaTiOa and FLC BaTiOa at a frequency of 1 kHz. The Enhanced Electro-Optical Properties of Liquid Crystals Devices by Doping with Ferroelectric Nanoparticles 201 permittivity increased drastically when cooling to 60 C in the SmC phase. We can see from Figure 7 that there was very little difference in the permittivity for the different liquid crystal phases of pure FLC and FLC wt BaTiOg whereas the permittivity of the various liquid crystal phases of FLC wt BaTiOg were twice those of the others. In particular the maximum permittivity occurred at 49 C while the average permittivity of its SmC phase was approximately times those of the pure FLC and FLC BaTiOg Therefore one can see that the doping of BaTiOg effectively enhanced the permittivity of the liquid crystal material with its large electric dipole moment. In addition one can also observe the significant differences in the slopes of the permittivity curves when the pure FLC FLC BaTiOg and FLC BaTiOg samples entered the SmC phase. A comparison of the pure FLC and FLC BaTiOg revealed that while there was little difference .
