Lead-free sodium-potassium niobate-based piezoelectric materials are most intensively studied in order to replace the widely used Pb-based ones.In this work,the effects of modification of compositions by donor and acc...Lead-free sodium-potassium niobate-based piezoelectric materials are most intensively studied in order to replace the widely used Pb-based ones.In this work,the effects of modification of compositions by donor and acceptor dopants in the A-and B-sites of perovskite lattice on structure,dielectric,ferroelectric,and piezoelectric properties of ceramics from Morphotropic Phase Boundary in the(1-x)(K_(0.5)Na_(0.5))NbO_(3)-xBaTiO_(3) system and in compositions with x=0.05 and 0.06 additionally doped by Ni^(3+) cations have been studied.展开更多
Influence of BiFeO_(3)(BF)on phase formation,unit cell parameters,microstructure,dielectric and ferroelectric properties of solid solutions close to the morphotropic phase boundary in the(Na_(0.5)Bi_(0.5))TiO_(3)–(K_...Influence of BiFeO_(3)(BF)on phase formation,unit cell parameters,microstructure,dielectric and ferroelectric properties of solid solutions close to the morphotropic phase boundary in the(Na_(0.5)Bi_(0.5))TiO_(3)–(K_(0.5)Na_(0.5))NbO_(3) system additionally modified by the low-melting KCl additives has been studied.The formation of pure perovskite structure samples decrease in the unit cell parameters and increase in the TC value stimulated by the BF addition have been revealed.It was proved that modification of compositions by small amounts of the BF and KCl additives leads to improvement of dielectric parameters.展开更多
Solid solutions on the base of composition from morphotropic phase boundary(1-x)BiScO_(3)–xPbTiO_(3) with x=0.64,0.645,0.65 were prepared from nitrates solutions.Variations in phase content,structure parameters,micro...Solid solutions on the base of composition from morphotropic phase boundary(1-x)BiScO_(3)–xPbTiO_(3) with x=0.64,0.645,0.65 were prepared from nitrates solutions.Variations in phase content,structure parameters,microstructure,dielectric and piezoelectric properties of dense ceramic samples were studied.The first-order phase transitions were observed at temperatures near 700 K.The influence of the processing conditions on the morphology,temperature of phase transitions,and dielectric parameters was observed.In some ceramics effect of dielectric relaxation was observed at high temperatures.This effect was explained by the contribution from ionic transport due to the oxygen vacancies creation during high temperature sintering.展开更多
基金supported by the Russian Foundation for Basic Research(Project 16-53-48009).
文摘Lead-free sodium-potassium niobate-based piezoelectric materials are most intensively studied in order to replace the widely used Pb-based ones.In this work,the effects of modification of compositions by donor and acceptor dopants in the A-and B-sites of perovskite lattice on structure,dielectric,ferroelectric,and piezoelectric properties of ceramics from Morphotropic Phase Boundary in the(1-x)(K_(0.5)Na_(0.5))NbO_(3)-xBaTiO_(3) system and in compositions with x=0.05 and 0.06 additionally doped by Ni^(3+) cations have been studied.
基金The work was supported by the Russian Foundation for Basic Research(Grant 15-03-03269).
文摘Influence of BiFeO_(3)(BF)on phase formation,unit cell parameters,microstructure,dielectric and ferroelectric properties of solid solutions close to the morphotropic phase boundary in the(Na_(0.5)Bi_(0.5))TiO_(3)–(K_(0.5)Na_(0.5))NbO_(3) system additionally modified by the low-melting KCl additives has been studied.The formation of pure perovskite structure samples decrease in the unit cell parameters and increase in the TC value stimulated by the BF addition have been revealed.It was proved that modification of compositions by small amounts of the BF and KCl additives leads to improvement of dielectric parameters.
基金supported by the Russian Foundation for Basic Research,Grant No.12-03-00388.
文摘Solid solutions on the base of composition from morphotropic phase boundary(1-x)BiScO_(3)–xPbTiO_(3) with x=0.64,0.645,0.65 were prepared from nitrates solutions.Variations in phase content,structure parameters,microstructure,dielectric and piezoelectric properties of dense ceramic samples were studied.The first-order phase transitions were observed at temperatures near 700 K.The influence of the processing conditions on the morphology,temperature of phase transitions,and dielectric parameters was observed.In some ceramics effect of dielectric relaxation was observed at high temperatures.This effect was explained by the contribution from ionic transport due to the oxygen vacancies creation during high temperature sintering.
