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Identifying and Passivating Killer Defects in Pb-Free Double Cs 2 AgBiBr 6 Perovskite
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Mechanistic Study of Pb(II) Removal by TiO2 and Effect of PO4
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High Thermoelectric Performance of AgSb 1– x Pb x Se 2 Prepared by Fast Nonequilibrium Synthesis
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Superior Capacitive Energy-Storage Performance in Pb-Free Relaxors with a Simple Chemical Composition
Chemical design of lead-free relaxors with simultaneously high energy density (W rec ) and high efficiency (η) for capacitive energy-storage has been a big challenge for advanced electronic systems. The current situation indicates that realizing such superior energy-storage properties requires highly complex chemical components. Herein, we demonstrate that, via local structure design, an ultrahigh W rec of 10.1 J/cm 3 , concurrent with a high η of 90%, as well as excellent thermal and frequency stabilities can be achieved in a relaxor with a very simple chemical composition. By introducing 6s 2 lone pair stereochemical active Bi into the classical BaTiO 3 ferroelectric to generate a mismatch between A- and B-site polar displacements, a relaxor state with strong local polar fluctuations can be formed. Through advanced atomic-resolution displacement mapping and 3D reconstructing the nanoscale structure from neutron/X-ray total scattering, it is revealed that the localized Bi enhances the polar length largely at several perovskite unit cells and disrupts the long-range coherent Ti polar displacements, resulting in a slush-like structure with extremely small size polar clusters and strong local polar fluctuations. This favorable relaxor state exhibits substantially enhanced polarization, and minimized hysteresis at a high breakdown strength. This work offers a feasible avenue to chemically design new relaxors with a simple composition for high-performance capacitive energy-storage.
Two-Dimensional Halide Pb-Perovskite–Double Perovskite Epitaxial Heterostructures
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Graphene Oxide as a Pb(II) Separation Medium: Has Part of the Story Been Overlooked?
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Enhancements of electric field and afterglow of non-equilibrium plasma by Pb(ZrxTi1−x)O3 ferroelectric electrode
Abstract Manipulating surface charge, electric field, and plasma afterglow in a non-equilibrium plasma is critical to control plasma-surface interaction for plasma catalysis and manufacturing. Here, we show enhancements of surface charge, electric field during breakdown, and afterglow by ferroelectric barrier discharge. The results show that the ferroelectrics manifest spontaneous electric polarization to increase the surface charge by two orders of magnitude compared to discharge with an alumina barrier. Time-resolved in-situ electric field measurements reveal that the fast polarization of ferroelectrics enhances the electric field during the breakdown in streamer discharge and doubles the electric field compared to the dielectric barrier discharge. Moreover, due to the existence of surface charge, the ferroelectric electrode extends the afterglow time and makes discharge sustained longer when alternating the external electric field polarity. The present results show that ferroelectric barrier discharge offers a promising technique to tune plasma properties for efficient plasma catalysis and electrified manufacturing.
Heteromeric three-stranded coiled coils designed using a Pb(ii)(Cys)[subscript 3] template mediated strategy
Abstract not provided
Degradation mechanisms in mixed-cation and mixed-halide Cs x FA 1−x Pb(Br y I 1−y ) 3 perovskite films under ambient conditions
With in situ ESEM and GIWAXS we saw that the perovskite degradation passes through hexagonal polytypes and is dependent on the composition.
Structural evolution of a high-temperature piezoelectric Pb(In 1/2 Nb 1/2 )O 3 –PbTiO 3 ceramic under an in situ electric field
The PIN–0.36PT relaxor ferroelectric at the MPB exhibits reversible phase transformation and relatively flexible M structure, which enable large lattice strain and domain switching, and are responsible for the enhanced piezoelectric properties.
Stereochemical expression of Bi 6s 2 lone pairs mediates fluoride-ion (De)insertion in tunnel-structured Bi 2 PdO 4 and Bi 1.6 Pb 0.4 PtO 4
An energy storage concept using anions as charge carriers is explored based on solution-phase fluoride-ion insertion in periodic solids. Redox reactions are mediated by d-block centers, whereas Bi 3+ lone pairs enable reversible F-ion diffusion.