An analysis of heterophase states was carried out for ferro-active solid solutions of the system(1-x-y)NaNbO_(3)-x KNbO_(3)-y CdNb_(2)O_(6).A complete stress relief at interfaces between phases in solid solutions with...An analysis of heterophase states was carried out for ferro-active solid solutions of the system(1-x-y)NaNbO_(3)-x KNbO_(3)-y CdNb_(2)O_(6).A complete stress relief at interfaces between phases in solid solutions with y=0.05 and x=0.10,0.40,and 0.45 is realized at the single-domain state of the tetragonal and orthorhombic phases.In solid solutions with y=0.05 and x=0.05 and 0.20,as well as with y=0.075 and 0.10,and x=0.15,the formation of a planar interphase boundary being parallel to a zero-net-strain plane occurs at the elastic matching of the single-domain tetragonal and polydomain orthorhombic phases.In contrast to this,at y=0.05 and x=0.25,0.30,and 0.35,the complete stress relief is associated with a co-existence of the single-domain orthorhombic and polydomain tetragonal phases,however in some cases,the tetragonal phase aims at a monodomainization.展开更多
The paper reports results on the complex study on ferroelectric ceramics that represent solid solutions containing components with a perovskite-type or columbite-type structure.Solid solutions of a three-component(1−x...The paper reports results on the complex study on ferroelectric ceramics that represent solid solutions containing components with a perovskite-type or columbite-type structure.Solid solutions of a three-component(1−x−y)NaNbO_(3)−xKNbO_(3)−yCdNb_(2)O_(6) system are manufactured at x=0.05-0.20 and y=0.10.Domain structures in ceramic grains are studied.The consistency between experimental and calculated results is examined for coexisting phases split into non-180°domains(mechanical twins)in the solid solution with x=0.15.A correlation between the internal structure(crystal,domain,granular,and defect)and fundamental electromechanical and polarization properties is stated for the studied three-component solid solutions.展开更多
This paper studies the dielectric spectra of solid solutions(SS)of the system(1−x−y)NaNbO_(3)-xKNbO_(3)-yCdNb_(2)O_(6) y=0.075,x=0.05÷0.30 in the temperature range(10÷900)K.The formation of a local maximum w...This paper studies the dielectric spectra of solid solutions(SS)of the system(1−x−y)NaNbO_(3)-xKNbO_(3)-yCdNb_(2)O_(6) y=0.075,x=0.05÷0.30 in the temperature range(10÷900)K.The formation of a local maximum was established in the interval(260÷300)K at small x values,which,as KNbO3 increases,is gradually blurred and becomes an inflection point.Detected in SS with x=0.05÷0.10,the shift of the maxima of dependencesε′/ε_(0)(T)andε″/ε_(0)(T),depending on the frequency of the electric field at the temperature ranges(300÷304)K and(258÷271)K,is not related to relaxation.This anomaly may indicate a crystallographic disorder to A and B positions.The conclusion is made about the expediency of using the obtained results for the development of functional ferroactive materials.展开更多
基金support of the Ministry of Science and Higher Education of the Russian Federation(State task in the field of scientific activity in 2023)Project No.FENW-2023-0010/(GZ0110/23-11-IF).
文摘An analysis of heterophase states was carried out for ferro-active solid solutions of the system(1-x-y)NaNbO_(3)-x KNbO_(3)-y CdNb_(2)O_(6).A complete stress relief at interfaces between phases in solid solutions with y=0.05 and x=0.10,0.40,and 0.45 is realized at the single-domain state of the tetragonal and orthorhombic phases.In solid solutions with y=0.05 and x=0.05 and 0.20,as well as with y=0.075 and 0.10,and x=0.15,the formation of a planar interphase boundary being parallel to a zero-net-strain plane occurs at the elastic matching of the single-domain tetragonal and polydomain orthorhombic phases.In contrast to this,at y=0.05 and x=0.25,0.30,and 0.35,the complete stress relief is associated with a co-existence of the single-domain orthorhombic and polydomain tetragonal phases,however in some cases,the tetragonal phase aims at a monodomainization.
基金support of the Ministry of Science and Higher Education of the Russian Federation(State Task in the Field of Scientific Activity,Scientific Project No.0852-2020-0032/BAZ0110/20-3-07IF).
文摘The paper reports results on the complex study on ferroelectric ceramics that represent solid solutions containing components with a perovskite-type or columbite-type structure.Solid solutions of a three-component(1−x−y)NaNbO_(3)−xKNbO_(3)−yCdNb_(2)O_(6) system are manufactured at x=0.05-0.20 and y=0.10.Domain structures in ceramic grains are studied.The consistency between experimental and calculated results is examined for coexisting phases split into non-180°domains(mechanical twins)in the solid solution with x=0.15.A correlation between the internal structure(crystal,domain,granular,and defect)and fundamental electromechanical and polarization properties is stated for the studied three-component solid solutions.
基金The research was supported by the Strategic Academic Leadership Program of the Southern Federal University(“Priority 2030”)This report is presented at the 10th Anniversary International Conference on“Physics and Mechanics of New Materials and Their Applications”(PHENMA 2021),Divnomorsk,Russia,May 23-27,2022.
文摘This paper studies the dielectric spectra of solid solutions(SS)of the system(1−x−y)NaNbO_(3)-xKNbO_(3)-yCdNb_(2)O_(6) y=0.075,x=0.05÷0.30 in the temperature range(10÷900)K.The formation of a local maximum was established in the interval(260÷300)K at small x values,which,as KNbO3 increases,is gradually blurred and becomes an inflection point.Detected in SS with x=0.05÷0.10,the shift of the maxima of dependencesε′/ε_(0)(T)andε″/ε_(0)(T),depending on the frequency of the electric field at the temperature ranges(300÷304)K and(258÷271)K,is not related to relaxation.This anomaly may indicate a crystallographic disorder to A and B positions.The conclusion is made about the expediency of using the obtained results for the development of functional ferroactive materials.
