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The polycrystalline (1-x)BiFeO3-xNa0.5Bi0.5TiO3, x = 0.00, 0.05, 0.10 and 0.15, ceramics were prepared using conventional solid-state route. The structural studies using X-ray diffraction and Raman measurements confirmed the rhombohedral R3c structure of the compounds. The scanning electron micrographs showed that grain size decreased, and the density of the compounds increased with the higher Na0.5Bi0.5TiO3 content. The weak ferromagnetism was induced in the solid solution of antiferromagnetic BiFeO3 compound with Na0.5Bi0.5TiO3 content. The structural distortions were increased with the increase of x, which favours the increase of weak ferromagnetism in the antiferromagnetic compound. The electric polarisation measurements indicated that leakage character decreased with the increase in Na0.5Bi0.5TiO3 fraction. The temperature and frequency-dependent dielectric measurements showed that the dielectric constant was improved and loss tangent was decreased in Na0.5Bi0.5TiO3 rich compounds. The temperature dependence of dielectric constant data showed a dielectric anomaly near the magnetic transition of BiFeO3, which shifted towards the lower temperature side with the increase of x. The UV-VIS-NIR spectroscopy measurements evidenced an increase in band gap energy for higher Na0.5Bi0.5TiO3 concentration.. [ABSTRACT FROM AUTHOR]

Modern MT (www.modernmt.eu) is a three-year Horizon 2020 innovation action (2015-2017) to develop new open-source machine translation technology for use in translation production environments, both fully automatic and as a back-end in interactive post-editing scenarios. Led by Translated srl, the project consortium also includes the Fondazione Bruno Kessler (FBK), the University of Edinburgh, and TAUS B.V. Modern MT has received funding from the European Union's Horizon 2020 research and innovation programme under Grant Agreement No645487 (call ICT-17-2014). [ABSTRACT FROM AUTHOR]

Layered 2D/2D heterointerface composites experience interesting properties that greatly stimulate the recent surge in the attention as robust supercapacitor electrode materials, especially the MXene-based 2D/2D heterointerface for its robust energy storage compatibility. This report unveils a synergistically in situ prepared 2D/2D Nb 2 C/Ti 3 C 2 MXene (NCTC) heterointerface nanoarchitecture by facile one-pot chemical etching. The methodology adopted enables the interconnected and simultaneous growth of MXenes exposing and retaining their active surfaces for enhanced ion diffusion pathways, charge storage dynamics, microstructural stability, and a noticeable potential window. Henceforth, the in situ developed NCTC heterointerface electrode delivered an excellent specific capacitance of 584 F/g at 2 A/g with a commendable energy density of 38.5 W h/kg in MXene supercapacitors owing to the augmented surface- and redox-based charge storage at the interface. Finally, the developed all-solid-state system demonstrated a superior cycling retention of 98% capacitance after 50,000 cycles. These superlative results encourage the exploration of such prospective 2D/2D heterointerfaces with intriguing charge storage and microstructural attributes for designing next-generation energy storage systems.

The 2D/2D layered materials are gaining much-needed attention owing to the unprecedented results in supercapacitors by their robust structural and electrochemical compatibility. Here, a facile scalable synthesis of 2D/2D MXene/boron carbon nitride (BCN) heterostructure through no residue direct pyrolysis is reported. The process allows the in-situ growth of BCN nanosheets unravelling the surfaces of MXene synergistically that provide an interconnected conductive network with wide potential window, augmented proportion of Ti sites at elevated temperature removing terminal groups enabling high pseudocapacitive activity and impressive stability. As a result, the as-assembled MXene/BCN electrode records a high specific capacitance of 1173 F g -1 (1876 C g -1 ) at 2 A g -1 and an energy density of 45 Wh kg -1 . Further, the fabricated solid-state device exhibits an ultra-high cyclability of 100% capacitive retention after 100 000 cycles. This will be an epitome for future 2D/2D heterostructures with commendable electrochemical properties as an expedient solution for energy storage applications., (© 2021 Wiley-VCH GmbH.)