Thermal Depolarization in the High‐Temperature Ternary Piezoelectric System xPbTiO₃–yBiScO₃–zBi(Ni_1/2Ti_1/2)O₃

Abstract

In the high‐temperature ternary perovskite piezoelectric system xPbTiO3–yBiScO3–zBi(Ni1/2,Ti1/2)O3 (PT–BS–BNiT), the addition of bismuth to the A site and nickel to the B site leads to compositions that exhibit diffuse relaxor‐like behavior. For these, depolarization temperature, not Curie point, is the critical value of temperature. Depolarization temperature (Td) is defined as the temperature at which the steepest loss in polarization occurs. This temperature is observed in poled materials through two different methods: loss tangent measurements and in situ d33. Across the ternary system, multiple dielectric anomalies occurred which was observed in dielectric tests where the dielectric peak broadens and becomes frequency dependent as BNiT content increased. For different compositions, the value of Td ranged between 275°C–375°C. Values for the piezoelectric coefficient increased with temperature up to d33 = 1000 pC/N during in situ d33. High temperature (up to 190°C) and high field (up to 40 kV/cm) were also applied to test ferroelectric properties in these regimes.

Effect of composition gradient on domain structure and piezoelectric properties in Mn-doped KNN single crystals

“…For example, the piezoelectric properties of (PbTiO 3 –PbZrO 3 , PZT) ceramics produced by ion doping are as high as 550 pC N −1 . 13 The piezoelectric performance of Sm-doped PMN-PT crystal can be as high as 4100 pC N −1 by enhancing the inhomogeneity of the crystal local structure. 14 When the morphotropic phase boundary (MPB) multiphase coexistence domain structure of R 3 c and P 4 mm was constructed by adjusting the content of BiTiO 3 , the d 33 of (1 − x )(Bi 0.5 Na 0.5 )TiO 3 – x BiTiO 3 (BNT– x BT) ceramics reached 131 pC N −1 .…”

Low-Temperature Sintering of Bi(Ni0.5Ti0.5)O3-BiFeO3-Pb(Zr0.5Ti0.5)O3 Ceramics and Their Performance

“…Based on these research studies, a pseudo-ternary system was constructed in this work, where Bi(Ni 0.5 Ti 0.5 )O 3 (BNT) was selected as one end component, which has a perovskite structure with a B-site occupied by equivalent Ni 2+ and Ti 4+ ions [15], and Pb(Zr 0.5 Ti 0.5 )O 3 was selected as another end component, which can stabilize the perovskite structure more effectively than PbTiO 3 . Ji et al devised a pseudo-binary system xBi(Ni…”

Structure-property relationships in the lead-free piezoceramic system K0.5Bi0.5TiO3 - BiMg0.5Ti0.5O3

“…1 Despite its relatively high Tc the maximum working temperature of most types of PZT is ~ 200-250 °C, presumably due to a combinatio n of property degradation and instability under electrical and mechanical loading. 3,4 A range of chemica l dopants, commonly classified as donors (soft PZT) or acceptors (hard PZT), are used to tailor the properties of PZT for specific applications.…”