The research findings of the phase composition,nanostructure and optical properties of strontium-barium niobate thin films are discussed.Sr_(x)Ba_(1−x)Nb_(2)O_(6)nanosized films(x=0.5 and 0.61)were characterized by XR...The research findings of the phase composition,nanostructure and optical properties of strontium-barium niobate thin films are discussed.Sr_(x)Ba_(1−x)Nb_(2)O_(6)nanosized films(x=0.5 and 0.61)were characterized by XRD,SEM and AFM studies.Reflective multi-angle ellipsometry and spectrophotometry were used to determine the optical parameters(refractive index,its dispersion,and thickness of the damaged surface layer)of thin films.It was shown that SBN-50 and SBN-61 thin films were grown c-oriented on Al_(2)O_(3)(0001)and heteroepitaxial on MgO(001)substrates.The increase of refractive index,approaching its maximum value in the bulk material for a given composition as the film thickness increases,is observed.展开更多
It has been established that in plates made of hot-pressed ferroelectric ceramics PZT-19(Tc=300℃),after metal electrodes from Ag are burned into opposite surfaces with different depths of mechanical damage,counter-di...It has been established that in plates made of hot-pressed ferroelectric ceramics PZT-19(Tc=300℃),after metal electrodes from Ag are burned into opposite surfaces with different depths of mechanical damage,counter-directional stationary deformation gradients and,accordingly,internal electric displacement fields create a stationary flexoelectric effect.As a result,unpolarized ceramics below the Curie temperature become a pyroelectric,and above it become a pyroelectric bolometer.After polishing the less damaged surface and replacing the Ag(valency v=3)electrode with Cr(v=6)by thermal evaporation in vacuum from the intact surface,a new thermally stable polarization is created,directed from the damaged surface in the interelectrode volume.Such plates have an asymmetric dielectric hysteresis loop,retain the values of the pyroelectric effect and piezoelectric effect in the ferroelectric phase,as well as the bolometric effect in the paraelectric phase after repeated heating cycles to 400℃ and cooling to T_(norm).展开更多
基金The authors are grateful to V.B.Shirokov for conducting studies of the films surface by the AFM method.This work was carried out within the framework of the State Assignment of the SSC RAS(Theme of State Registration No.01201354247).
文摘The research findings of the phase composition,nanostructure and optical properties of strontium-barium niobate thin films are discussed.Sr_(x)Ba_(1−x)Nb_(2)O_(6)nanosized films(x=0.5 and 0.61)were characterized by XRD,SEM and AFM studies.Reflective multi-angle ellipsometry and spectrophotometry were used to determine the optical parameters(refractive index,its dispersion,and thickness of the damaged surface layer)of thin films.It was shown that SBN-50 and SBN-61 thin films were grown c-oriented on Al_(2)O_(3)(0001)and heteroepitaxial on MgO(001)substrates.The increase of refractive index,approaching its maximum value in the bulk material for a given composition as the film thickness increases,is observed.
基金This research was performed into framework of financing RFBR grant number 19-08-00365A.
文摘It has been established that in plates made of hot-pressed ferroelectric ceramics PZT-19(Tc=300℃),after metal electrodes from Ag are burned into opposite surfaces with different depths of mechanical damage,counter-directional stationary deformation gradients and,accordingly,internal electric displacement fields create a stationary flexoelectric effect.As a result,unpolarized ceramics below the Curie temperature become a pyroelectric,and above it become a pyroelectric bolometer.After polishing the less damaged surface and replacing the Ag(valency v=3)electrode with Cr(v=6)by thermal evaporation in vacuum from the intact surface,a new thermally stable polarization is created,directed from the damaged surface in the interelectrode volume.Such plates have an asymmetric dielectric hysteresis loop,retain the values of the pyroelectric effect and piezoelectric effect in the ferroelectric phase,as well as the bolometric effect in the paraelectric phase after repeated heating cycles to 400℃ and cooling to T_(norm).
