Electrochemical and microstructural analysis of LiNiMnCoO cathode composites prepared using the SEED method.

Cathode composites were fabricated using the nuclear growth (SEED) method. Compared to mortar mixing, the SEED method demonstrated higher cycle stability, with a 90LiNiMnCoO-10LiPSI composite retaining 99.7% discharge capacity after six cycles compared to 66.

Magnetic Phase Transition-Induced Modulation of Ferroelectric Properties in Hexagonal FeO ( = Tb and Ho).

Hexagonal rare-earth iron oxides (FeO) exhibit spontaneous magnetization and room-temperature ferroelectricity simultaneously. However, achieving a large magnetoelectric coupling necessitates further exploration. Herein, we report the impact of the magnetic phase transition on the ferroelectric properties of epitaxial FeO ( = Tb and Ho) films prepared by pulsed laser deposition.

Chemical design of a new displacive-type ferroelectric.

Since the discovery of the ferroelectric perovskite-type oxide BaTiO in 1943, numerous materials have been surveyed as candidates for new ferroelectrics. Perovskite-type materials have played a leading role in basic research and applications of ferroelectric materials since the last century. Experimentalists and theoreticians have developed a new materials design stream for post-perovskite materials.

Room-Temperature Antiferroelectricity in Multiferroic Hexagonal Rare-Earth Ferrites.

The antiferroelectric (AFE) phase, in which nonpolar and polar states are switchable by an electric field, is a recent discovery in promising multiferroics of hexagonal rare-earth manganites (ferrites), -Mn(Fe)O. However, this phase has so far only been observed at 60-160 K, which restricts key investigations into the microstructures and magnetoelectric behaviors. Herein, we report the successful expansion of the AFE temperature range (10-300 K) by preparing -DyFeO films through epitaxial stabilization.

Skewed electronic band structure induced by electric polarization in ferroelectric BaTiO.

Skewed band structures have been empirically described in ferroelectric materials to explain the functioning of recently developed ferroelectric tunneling junction (FTJs). Nonvolatile ferroelectric random access memory (FeRAM) and the artificial neural network device based on the FTJ system are rapidly developing. However, because the actual ferroelectric band structure has not been elucidated, precise designing of devices has to be advanced through appropriate heuristics.

Modulating the Structure and Magnetic Properties of ε-FeO Nanoparticles via Electrochemical Li Insertion.

ε-FeO, a metastable phase of iron oxide, is widely known as a room-temperature multiferroic material or as a superhard magnet. Element substitution into ε-FeO has been reported in the literature; however, the substituted ions have a strong site preference depending on their ionic radii and valence. In this study, in order to characterize the crystal structure and magnetic properties of ε-FeO in the Fe/Fe coexisting states, Li was electrochemically inserted into ε-FeO to reduce Fe.

Layer matching epitaxy of NiO thin films on atomically stepped sapphire (0001) substrates.

Thin-film epitaxy is critical for investigating the original properties of materials. To obtain epitaxial films, careful consideration of the external conditions, i.e.