Enhanced pyroelectric response from domain-engineered lead-free (K0.5Bi0.5TiO3-BaTiO3)-Na0.5Bi0.5TiO3 ferroelectric ceramics

Flexoelectricity-Enhanced Photovoltaic Effect in Self-Polarized Flexible PZT Nanowire Array Devices

“…The data showed that the TSDC current was almost zero at room temperature and showed a sharp peak over 275 °C. The peak temperature is the Curie temperature ( T c ) of the PZT NWs, corresponding to the ferroelectric to nonpolar phase transition. , These results indicated that the nanowires prepared by the AAO template method had self-poling properties and the polar state could exist almost stably in a wide temperature range from 25 to 200 °C. The depolarization field generated by self-polarization was the main driving force for the separation of photogenerated carriers in the flat state.…”

Large pyroelectricity via engineered ferroelectric‐relaxor phase boundary

“…Among them, phase boundary engineering is the most attractive and effective strategy owing to the coexistence and completion of energetically comparable polar phases near this boundary, which can exhibit not only excellent pyroelectricity but also outstanding ferroelectricity and piezoelectricity 8–14 . In particular, a large room‐temperature pyroelectric coefficient of 3.26 × 10 −4 C m −2 K −1 and FOMs values were obtained in 0.2(2/3K 0.5 Bi 0.5 TiO 3 –1/3BaTiO 3 )–0.8Na 0.5 Bi 0.5 TiO 3 ‐textured ceramic attributed to the FE to antiferroelectric phase transition causing coherent 180° domain switching 15 . An enhanced room‐temperature pyroelectric coefficient of 5.7 × 10 −4 C m −2 K −1 was achieved in (1 − x )0.93(Bi 0.5 Na 0.5 )TiO 3 – x 0.07Ba(Zr 0.055 Ti 0.945 )O 3 solid solution near the morphotropic phase boundary (MPB) 16 .…”

Phase transition enhanced pyroelectric nanogenerators for self-powered temperature sensors

“…BTO has been selected as an environmentally friendly and lead-free ferroelectric material with excellent pyroelectric performance, where the ferroelectric-paraelectric phase transition temperature (Curie temperature, Tc) is ~ 130 o C. [34] In previous work, the temperature dependence of pyroelectric coefficient of BTO based materials was obtained by P-E loops or thermally stimulated depolarization current. [30,[35][36][37] The pyroelectric output current and power at a wide temperature range were measured for the first time in this work. The BTO ceramics were obtained by two-step sintering method [38] and to assess the pyroelectric properties, the ambient temperature during the measurement process was controlled by a sealed thermostat and the pyroelectric current as a result of a temperature change was measured from room temperature (below Tc) to 140 o C (above Tc).…”