Author
Japes Bera
Bio: Japes Bera is an academic researcher from National Institute of Technology, Rourkela. The author has contributed to research in topics: Ferrite (magnet) & Dielectric. The author has an hindex of 20, co-authored 58 publications receiving 1043 citations.
Topics: Ferrite (magnet), Dielectric, Permittivity, Ceramic, Grain boundary
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the Ni0.25−xMgxCu0.2Zn0.55 composition was synthesized through nitrate-citrate auto-combustion method.
106 citations
TL;DR: In this paper, Ni 0.25 Cu 0.20 Zn 0.55, Ni 1.5 Ni 2−x O 4 ferrite powders were synthesized through nitrate-citrate auto-combustion method.
104 citations
TL;DR: In this paper, the effect of lanthanum ion substitution for iron on the structural and magnetic properties of Ni-Cu-Zn ferrite was reported, and the Rietveld structure refinement was carried out; La solubility in spinel, residual stress in sintered core, quantity of secondary LaFeO 3 phase formed and change in lattice parameters, etc.
78 citations
TL;DR: In this paper, the autocatalytic nature of the combustion process has been studied by thermal analysis (DTA and TG) of the dried gels and the powders were calcined at 700°C/2µh and then pressed ferrite parts were sintered at 900µC/4õh.
70 citations
TL;DR: SiO 2 -Na 2 O-CaO based bioglass-ceramics was synthesized through sol-gel route using rice husk ash as silica source as discussed by the authors.
Abstract: SiO 2 –Na 2 O–CaO based bioglass-ceramics was synthesized through sol–gel route using rice husk ash as silica source. The decomposition behavior of gel was evaluated. Sodium–calcium–silicate phases were crystallized above 700 °C. Pellet made of glass-ceramics powder was sintered at 900 °C. In vitro bioactivity and biodegradability of glass-ceramics were investigated by incubation in simulated body fluid and Tris buffer solution respectively. Scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction were used to monitor the surface deposition on glass-ceramics during incubation. The material showed a good bioactivity with a formation of carbonated hydroxy apatite phase in 3 days of incubation. A quick degradation of the material was observed in Tris solution associated with an increase of pH due to the dissolution of Ca 2+ and Na + ionic species. All these results suggest the glass-ceramics, prepared utilizing rice husk ash, would be a low cost biomaterial for potential biomedical applications.
65 citations
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01 Sep 1955
TL;DR: In this paper, the authors restrict their attention to the ferrites and a few other closely related materials, which are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present.
Abstract: In this chapter, we will restrict our attention to the ferrites and a few other closely related materials. The great interest in ferrites stems from their unique combination of a spontaneous magnetization and a high electrical resistivity. The observed magnetization results from the difference in the magnetizations of two non-equivalent sub-lattices of the magnetic ions in the crystal structure. Materials of this type should strictly be designated as “ferrimagnetic” and in some respects are more closely related to anti-ferromagnetic substances than they are to ferromagnetics in which the magnetization results from the parallel alignment of all the magnetic moments present. We shall not adhere to this special nomenclature except to emphasize effects, which are due to the existence of the sub-lattices.
2,659 citations
TL;DR: A survey of the literature for ca. one thousand B-site substituted perovskite oxides can be found in this article, together with their electronic and magnetic properties and properties.
815 citations
TL;DR: Various attempts to improve upon these properties like different processing routes, surface modifications have been inculcated in the paper to provide an insight into the extent of research and effort that has been put into developing a highly superior titanium orthopaedic implant.
711 citations
TL;DR: A critical review that encompasses the fundamentals and state-of-the-art knowledge of barium titanate-based piezoelectrics is presented in this paper, where a detailed compilation of their functional and mechanical properties is provided.
Abstract: We present a critical review that encompasses the fundamentals and state-of-the-art knowledge of barium titanate-based piezoelectrics. First, the essential crystallography, thermodynamic relations, and concepts necessary to understand piezoelectricity and ferroelectricity in barium titanate are discussed. Strategies to optimize piezoelectric properties through microstructure control and chemical modification are also introduced. Thereafter, we systematically review the synthesis, microstructure, and phase diagrams of barium titanate-based piezoelectrics and provide a detailed compilation of their functional and mechanical properties. The most salient materials treated include the (Ba,Ca)(Zr,Ti)O3, (Ba,Ca)(Sn,Ti)O3, and (Ba,Ca)(Hf,Ti)O3 solid solution systems. The technological relevance of barium titanate-based piezoelectrics is also discussed and some potential market indicators are outlined. Finally, perspectives on productive lines of future research and promising areas for the applications of these ma...
697 citations
TL;DR: Overall, these findings establish the first nanoscale titanate photocatalyst for overall water splitting, although the process is less effective at the nanoscales.
Abstract: SrTiO3 (STO) is a large band gap (3.2 eV) semiconductor that catalyzes the overall water splitting reaction under UV light irradiation in the presence of a NiO cocatalyst. As we show here, the reactivity persists in nanoscale particles of the material, although the process is less effective at the nanoscale. To reach these conclusions, Bulk STO, 30 ± 5 nm STO, and 6.5 ± 1 nm STO were synthesized by three different methods, their crystal structures verified with XRD and their morphology observed with HRTEM before and after NiO deposition. In connection with NiO, all samples split water into stoichiometric mixtures of H2 and O2, but the activity is decreasing from 28 μmol H2 g–1 h–1 (bulk STO), to 19.4 μmol H2 g–1 h–1 (30 nm STO), and 3.0 μmol H2 g–1 h–1 (6.5 nm STO). The reasons for this decrease are an increase of the water oxidation overpotential for the smaller particles and reduced light absorption due to a quantum size effect. Overall, these findings establish the first nanoscale titanate photocatalys...
226 citations