Persistent type-II multiferroicity in nanostructured MnWO4 ceramics

Nanostructured Ceramic Oxides with a Slow Crack Growth Resistance Close to Covalent Materials

Oxide ceramics are sensitive to slow crack growth because adsorption of water can take place at the crack tip, leading to a strong decrease of the surface energy in humid (or air) conditions. This is a major drawback concerning demanding, long-term applications such as orthopaedic implants. Here we show that a specific nanostructuration of ceramic oxides can lead to a crack resistance never reached before, similar to that of covalent ceramics.

Multiferroicity with high-Tc in ceramics of the YBaCuFeO5 ordered perovskite

A dielectric anomaly has been found near the incommensurate to commensurate antiferromagnetic phase transition (TN2=230 K) in YBaCuFeO5 ceramics, a compound which crystallizes in an ordered perovskite structure. The existence of electric polarization below TN2 suggests the magnetism induced charge polarization effect that is also confirmed by its strong magnetic field dependence below TN2. Accordingly, the peak near TN2 of the magnetodielectric effect indicates a maximum of magnetodielectric susceptibility near the spin reorientation transition. Considering the abundance of magnetic compounds …

通过高压扭转与放电等离子烧结相结合制备兼具高硬度和高韧性的块体纳米结构氧化锆陶瓷

Bulk Nanostructured Zirconia Ceramics with High Hardness and Toughness via Integration of High-Pressure Torsion and Spark Plasma Sintering

本研究针对传统高温烧结难以制备块体纳米结构陶瓷的问题，结合高压扭转与放电等离子烧结制备出平均晶粒80nm、高硬度高韧性的钇稳定氧化锆陶瓷，验证了位错对提升断裂韧性的作用。

Properties of LiMnBO3 glasses and nanostructured glass-ceramics

Polycrystalline LiMnBO3 is a promising cathode material for Li-ion batteries. In this work, we investigated the thermal, structural and electrical properties of glassy and nanocrystallized materials having the same chemical composition. The original glass was obtained via a standard meltquenching method. SEM and 7Li solid-state NMR indicate that it contains a mixture of two distinct glassy phases. The results suggest that the electrical conductivity of the glass is dominated by the ionic one. The dc conductivity of initial glass was estimated to be in the order of 10-18 S.cm-1 at room temperat…

使用纳米多孔阳极氧化铝模板和纳米结构金/镍铬微晶玻璃基板进行钽电沉积

Tantalum electrodeposition using a nanoporous anodic alumina template and a nanostructured gold/nickel-chromium glass-ceramic substrate

本研究在离子液体中通过阳极氧化铝模板和金基板实现钽电沉积，形成纳米结构钽与纳米多孔金，适用于高性能电子器件。

In-situ non-equilibrium nanomechanics in a proton-conducting ceramic at low temperatures

Nanostructured proton-conducting ceramics (PCCs) have attracted considerable interest as moderate-temperature proton conductors. Structure dynamics during proton conduction, particularly at grain boundaries, are crucial for stability and proton transport in nanostructured PCCs. A common assumption is that PCCs are structurally stable at low operating temperatures; however, material polycrystallinity, absorption, and reactive operating conditions have so far prevented verifying this assumption by nano resolved in-situ structure measurements. Here, in an archetypal PCC BaZr0.8Y0.2O3-d the premis…