High dielectric permittivity and electrostrictive strain in a wide temperature range in relaxor ferroelectric (1-x)[Pb(Mg1/3Nb2/3)O3-PbTiO3]-xBa(Zn1/3Nb2/3)O3 solid solutions

Dielectric and ferroelectric properties of CuO-doped lead magnesium niobate-based relaxor ferroelectric ceramics

“…Recently, the ferroelectric properties of relaxor-PT ceramics have attracted robust interest from the point of view of electric field-induced strain. 8,9 It is known that the piezoelectric effect is a linear relationship between the input strain and induced charge or input electric field and induced deformation, i.e., the strain. 10 To ferroelectric materials, such a linear relationship can be only held at a relatively small electric field region, since strong nonlinear strain responses are often observed in ferroelectric materials due to the high-order electromechanical coupling effect, mainly due to the second-order coupling effect, i.e., the electrostrictive effect.…”

“…It is suggested by Jin et al that introducing perovskite compounds into the relaxor-PT matrix could lower the T C to around room temperature. 8,9 For example, Ba(Zn 1=3 Nb 2=3 )O 3 (BZN) and Bi(Li 0:5 Nb 0:5 )O 3 (BLN) can effectively lower the T C of [0.5573Pb(Mg 1=3 Nb 2=3 )O 3 -0.4427PbTiO 3 ] (PMNT) and induce purely electrostrictive strains. 8,9 However, in PMNT ceramics, the sintering temperature was set as 1280 ○ C, which is much higher than the sintering temperature for lead-based ferroelectric materials and results in phase segregation.…”

“…8,9 For example, Ba(Zn 1=3 Nb 2=3 )O 3 (BZN) and Bi(Li 0:5 Nb 0:5 )O 3 (BLN) can effectively lower the T C of [0.5573Pb(Mg 1=3 Nb 2=3 )O 3 -0.4427PbTiO 3 ] (PMNT) and induce purely electrostrictive strains. 8,9 However, in PMNT ceramics, the sintering temperature was set as 1280 ○ C, which is much higher than the sintering temperature for lead-based ferroelectric materials and results in phase segregation. 8 A high sintering temperature should be avoided as much as possible if the materials are fabricated based on the multilayer ceramic capacitor (MLCC) technique.…”

“…8,9 However, in PMNT ceramics, the sintering temperature was set as 1280 ○ C, which is much higher than the sintering temperature for lead-based ferroelectric materials and results in phase segregation. 8 A high sintering temperature should be avoided as much as possible if the materials are fabricated based on the multilayer ceramic capacitor (MLCC) technique. Thus, lowering the sintering temperature of relaxor-PT-based electrostrictive ceramics is very important from the point of view of industrial manufacture.…”

“…Therefore, the content of CuO additive should be optimized according to specific requirement. Although the ferroelectric properties of undoped PMNT-xBZN relaxor ferroelectric ceramics has been reported, 8 the effect of CuO on PMNT-xBZN has not been thoroughly investigated. In this work, in order to gain a deep understanding of the effect of CuO on dielectric and ferroelectric properties of PMNT-xBZN ceramics, we conduct a symmetrical study in this system by means of XRD, SEM, dielectric spectra, polarization-electric field hysteresis loops and strain-electric field curves.…”