BiFeO3 is an interesting multiferroic material with potential use in sensors and transducers. However, the high coercive field low dielectric strength of this make poling process extremely difficult. Poling becomes a lot easier if ceramic particles are incorporated non-conductive polymer comparable properties. In work, unstructured composites consisting non-piezoactive PVDF terpolymer matrix made volume fraction ranging from 20% to 60%. The highest piezoelectric charge voltage constant...

This work expands the library of high-performance polyimide covalent organic frameworks (COFs) through imidization polymerization mellitic trianhydride with two different triamines. The resulting porous polymers possess microporous structures (< 2 nm pore sizes), exhibit relatively large surface areas (> 300 m2 g−1), and are thermally stable up to 275 °C. Moreover, both COFs show good CO2 uptake capacities around 40 cm3 g−1. Among material class polymers, a special subclass, because their...

Abstract Polymer-piezoceramic composites have drawn a lot of attention for sensor and energy harvesting applications. Poling such materials can be difficult due to the electric field getting mostly distributed over low dielectric constant matrix. During this process, electrical matrix conductivity plays vital role. This work shows how two different polymer materials, loaded with various piezoelectric ceramic fillers, very poling efficiencies simply their intrinsic conductivity. It is shown...

Intermetallic phases have been investigated with respect to their ability accept small atoms in interstitial sites without changing the host structure. Among those, intermetallic compounds crystallizing tetragonal CeScSi-type structure are able absorb hydrogen atoms. These of particular interest because they can show electride-like character and, therefore, be exploited as new catalysts. Here we report case GdScGe which uptakes at 623 K and under a H2 gas pressure between 0.5 4 MPa. The...

The investigation of layered intermetallic compounds containing light elements like hydrogen has great potential for superconductivity. We studied the insertion carbon atoms in CeScSi-type intermetallics (an ordered variant La2Sb structure type), and here, we report new carbide NdScSiC0.5. Carbon keeps pristine compound's space group, I4/mmm, but causes an anisotropic expansion unit cell with increase a parameter decrease c parameter. X-ray neutron diffraction measurements indicate existence...

BiFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> is a multiferroic material with the perovskite structure which promising for use in sensors and transducers. Single phase production of remains challenge, however. In this study, optimal calcination temperature to obtain close single powder was determined be 750°C. The sintering 775°C also found high density ceramics (≈ 95 % theoretical density). It shown that off-stoichiometry...

Abstract A new concept of the formation charge transfer (CT) complexes between an intrinsically electron‐donating conjugated microporous polymer and a small molecule acceptor is reported. Spirobifluorene‐based mesoporous organic polymers with high porosity Brunauer–Emmett–Teller surface area are synthesized by Suzuki‐coupling reaction spirobifluorene pyrene monomers. The simple doping mesoporous, electron‐rich, 7,7,8,8‐tetracyanoquinodimethane as leads to efficient CT complexation in spaces....

Bismuth ferrite is a potentially interesting lead-free piezoelectric material for use in high-temperature applications due to its high Curie temperature. However, the coercive field and leakage currents of pure BiFeO3 (BFO) prevent reaching theoretical performance level. The classic approach tailoring piezoceramic properties their desired conditions doping. In this work, we produce bulk BFO by conventional sintering method with single element doping cobalt (0.125–3 at. %) or titanium (1–5...

While most of the work on piezoelectric composites focuses methods to reduce dielectric constant composite (for better sensor and energy harvesting performance), for haptic feedback actuator applications opposite is desirable. We present here a study effect adding second ceramic phase (BaTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanoparticles) (K xmlns:xlink="http://www.w3.org/1999/xlink">0.5</sub> N )...

In this work, we present the impact of using Na2CO3 as a sintering aid and grain growth agent on crystal structure, microstructure, piezoelectric properties (Bi0.5Na0.5)TiO3 ceramics. The addition leads to substantial increase in size density even at reduced temperature 1025 °C. However, same time, value constant d33 drops dramatically. Using high-resolution x-ray diffraction analysis, demonstrate that decrease is due change chemical composition base material rather than size. High...

Back Cover: The artwork depicting article 1900415 by Atsushi Nagai and coworkers presents a zoom-in of conjugated nicroporous polymers network, showing how the monomers are spatially connected, with an emphasis on 90° kink within spirobifluorene segment at centre image. Most importantly, 7,7,8,8-tetracyanoquinodimethane (TCNQ) acceptor molecules shown in yellow ellipsoids, which emphasizes that these not covalently connected to polymer but rather interact physical (charge-transfer) manner.