Spark plasma sintering of microwave processed nanocrystalline barium titanate and their characterisations
15 May 2013 Publication year: 2013 Source:Materials Chemistry and Physics, Volume 139, Issues 2–3
Nanocrystalline barium titanate (BT) was synthesized by the high-energy planetary mill assisted novel hybrid processing methodology. As-milled precursors were microwave calcined and subsequently sintered by spark plasma sintering (SPS). Powders were characterised by XRD, laser Raman spectroscopy, BET and TEM techniques. Microstructure, purity, thermal stability and dielectric characteristics of the sintered BT were analyzed using FE-SEM, EDX, TGA and LCZ meter. Nanocrystalline nature of BT was evident from the enhanced peak broadening noticed in the XRD pattern and from the TEM image. Raman spectra corroborated well with the XRD results. FE-SEM image revealed a fairly dense and uniform microstructure, which was attributed to the high reactivity and needle shaped morphology of the mechanically activated microwave calcined powders, which showed a surface area of about 20 m2 g−1. Microwave calcined SPS processed BT showed a thermal stability of 99.5% as evident from the thermo-gravimetric analysis. Superior dielectric response was shown by the hybrid processed BT which is highly suitable for capacitor applications.
► Nanostructured barium titanate synthesized by a novel 3-step hybrid method. ► The powders were densified by spark plasma sintering. ► Average grain size was found to be 150 nm. ► Agglomerated, needle shaped grains were noticed in the microwave calcined as-milled precursors. ► Plasma sintered barium titanate showed a thermal stability of 99.5% and superior dielectric response.
Source:Microchemical Journal, Volume 142 Author(s): Cecilia S. Tettamanti, María L. Ramírez, Fabiana A. Gutierrez, Paula G. Bercoff, Gustavo A. Rivas, Marcela C. Rodríguez In this work, we report the building of a nanostructured platform wit ... more
Source:Microchemical Journal, Volume 142 Author(s): Zhenzhen Lu, Ruiqin Tan, Weiwei Chu, Shihui Tang, Wei Xu, Weijie Song Strontium hydrogen phosphate/Fe3O4 magnetic nanocomposite (M-SrHPO4) was successfully synthesized using a facile method ... more
Source:Radiation Physics and Chemistry, Volume 151 Author(s): A.J. Satti, J.A. Ressia, E. Molinari, A.E. Ciolino, E.M. Vallés Blends and composites were obtained by mixing commercial metallocenic linear low density polyethylene (LLDPE) and isot ... more
Leuphana University of Lüneburg, Germany, and information solutions provider Elsevier have announced the winners of the first Green and Sustainable Chemistry Challenge. The winning projects demonstrate the diversity and creativity of green and sustainable chemistry.
Elsevier and Leuphana l ... more
A new material that mimics coral could help remove toxic heavy metals like mercury from the ocean, according to a new study published in the Journal of Colloid and Interface Science. The researchers, from Anhui Jianzhu University in China, say their new material could provide inspiration fo ... more
The organic chemicals in fracking fluid have been uncovered in two new studies, providing a basis for water contamination testing and future regulation. The research, published in Trends in Environmental Analytical Chemistry and Science of the Total Environment, reveals that fracking fluid ... more