A study of dielectric properties of composite films on the base of poly(vinylidene fluoride-trifluoroethylene)copolymer P(VDFTrFE)and ferroelectric ceramics of barium lead zirconate titanate(BPZT)solid solution is pre...A study of dielectric properties of composite films on the base of poly(vinylidene fluoride-trifluoroethylene)copolymer P(VDFTrFE)and ferroelectric ceramics of barium lead zirconate titanate(BPZT)solid solution is presented in this work.The composite films containing up to 50 vol.%of BPZT grains with size1m were prepared by the solvent cast method.Frequency dependences of real and imaginary components of the complex permittivity were determined.The concentration dependence of the dielectric constant was discussed.展开更多
Relaxor ferroelectrics are one of the mysterious objects of the solid-state physics studied over 50 years.The physical properties of relaxors were mainly assessed by scattering and dielectric methods and revealed the ...Relaxor ferroelectrics are one of the mysterious objects of the solid-state physics studied over 50 years.The physical properties of relaxors were mainly assessed by scattering and dielectric methods and revealed the importance of polarization correlations with the short-range order,so-called polarization nanoscale regions.This paper review recent progress achieved by using piezoresponse force microscopy(PFM)to analyze the spatial distribution of polarization and its evolution with time,temperature,and electricfield for the most popular relaxor family:solid solutions between PbMg_(1/3)Nb_(2/3)O_(3) and PbTiO_(3).The PFM technique has proved to be a powerful tool for the investigation of local properties of relaxors where optical techniques obviously fail because of their lack of resolution.The PFM study of relaxors clearly helps to understand the mechanism of polarization distribution and illustrates the importance of mesoscopic polarization patterns that were until now overlooked by major theories of the relaxor state.展开更多
基金supported by the Russian Scientific Foundation(Grant N 15-19-00138).
文摘A study of dielectric properties of composite films on the base of poly(vinylidene fluoride-trifluoroethylene)copolymer P(VDFTrFE)and ferroelectric ceramics of barium lead zirconate titanate(BPZT)solid solution is presented in this work.The composite films containing up to 50 vol.%of BPZT grains with size1m were prepared by the solvent cast method.Frequency dependences of real and imaginary components of the complex permittivity were determined.The concentration dependence of the dielectric constant was discussed.
文摘Relaxor ferroelectrics are one of the mysterious objects of the solid-state physics studied over 50 years.The physical properties of relaxors were mainly assessed by scattering and dielectric methods and revealed the importance of polarization correlations with the short-range order,so-called polarization nanoscale regions.This paper review recent progress achieved by using piezoresponse force microscopy(PFM)to analyze the spatial distribution of polarization and its evolution with time,temperature,and electricfield for the most popular relaxor family:solid solutions between PbMg_(1/3)Nb_(2/3)O_(3) and PbTiO_(3).The PFM technique has proved to be a powerful tool for the investigation of local properties of relaxors where optical techniques obviously fail because of their lack of resolution.The PFM study of relaxors clearly helps to understand the mechanism of polarization distribution and illustrates the importance of mesoscopic polarization patterns that were until now overlooked by major theories of the relaxor state.
