Papers by Keyword: Solid-State Reaction

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Authors: Sergey M. Zharkov, Roman R. Altunin, Evgeny T. Moiseenko, Galina M. Zeer, Sergey N. Varnakov, Sergey G. Ovchinnikov
Abstract: Solid-state reaction processes in Fe/Si multilayer nanofilms have been studied in situ by the methods of transmission electron microscopy and electron diffraction in the process of heating from room temperature up to 900ºС at a heating rate of 8-10ºС/min. The solid-state reaction between the nanolayers of iron and silicon has been established to begin at 350-450ºС increasing with the thickness of the iron layer.
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Authors: Jian Min Zhu, G.B. Ma, F. Li, S.S. Huang, Q. Li, X.Q. Xin, Nai Ben Ming
Abstract: By means of solid-state reactions method, ZnSnO3 nanoparticles were prepared in the reactions of ZnCl2 and SnCl4·5H2O with KOH in the presence of added KCl crystal, and were assembled into 3-D aggregates with tetragonal-like shape in the size range of 20-200 nm. The products were characterized by powder X-ray diffraction (XRD), and the microstructures of the samples were investigated by transmission electron microscope (TEM), selected area electron diffraction (SAED) and high-resolution transmission electron microscope (HRTEM) in detail. Probable mechanisms for the formation of such tetragonal-like shape of ZnSnO3 3-D aggregates are proposed.
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Authors: Yong Tian Wang
Abstract: In this paper we describe the synthesis of nanocrystalline boron nitride (BN) with a hollow morphology by the reaction of NH4BF4 and NaNH2 at 500 oC for 24h. Characterized by XRD, FTIR, XPS, TEM, and EDXA spectra, the composition and morphology of the products were confirmed. The possible formation mechanism was also discussed.
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Authors: Qian Fa Deng, Zhi Xiong Zhou, Zhao Zhong Zhou, Ju Long Yuan, Ji Cui Wang
Abstract: As sapphire is an important substrate material, stringent surface quality requirements (i.e., surface finish and flatness) are required. In order to acquire the higher material removal rate and the better surface quality of sapphire, the solid state-reaction were introduced in this paper; abrasive of SiO2 and SiO2 with mixing the MgF2 power were compared to polish sapphire. The result showed that abrasive of SiO2 with mixing the MgF2 can obtain higher material removal rate and better surface quality. The result of the pr
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Authors: S.A. Seyyed Ebrahimi, Z. Pishgahi Fard
Abstract: Manganese- Zinc ferrite is one of the most important spinel ferrites which is used in the electronics applications. These ferrites have an open lattice and can tolerate large amounts of the other metallic ions in their lattice. One of these divalent ions that can sit in the unit cell of Mn-Zn ferrites is Magnesium. Mn-Mg-Zn ferrites are new materials which is thought to be a good candidate for dielectric applications. In this work, a suitable relative values of raw materials for preparing pure Mn-Mg-Zn ferrite powder have been determined. It is carried out by using XRD experiments. The optimum temperature and time of calcination were also investigated by DTA/TGA, XRD and SEM techniques.
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Authors: Y.V. Kudryavtsev, Sergey I. Sidorenko, Yu.N. Makogon, E.P. Pavlova, T.I. Verbitskaya, Y.P. Lee, Y.H. Hyun, V.A. Oksenenko
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Authors: Xuemin Pan, Heino Sieber, Stephan Senz, D. Hesse, J. Heydenreich
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Authors: Tunchanoke Khongnakhon, Oratai Jongprateep
Abstract: Barium titanate has been a common material for fabrication of capacitors. Synthesis of barium titanate can be achieved by various techniques. These techniques are believed to affect dielectric properties. This research was aimed at synthesizing BaTiO3 and Ba0.9 A0.1TiO3 (A = Al and Mg) powders by solid state reaction technique. Dielectric constant of barium titanate and the ones doped with 10 at% Al and Mg prepared by the solid state reaction technique had dielectric constant ranging from 109 to 280 at 1 MHz. Results from density examination revealed that barium titanate samples prepared by the solid state reaction had low density. This may leads to the decrease of dielectric constant. Results from this study suggested that the decline of the dielectric properties was attributed to chemical composition and density of samples.
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Authors: Hua Zou, Deng Feng Peng, Zhen Ming Chu, Xu Sheng Wang, Yan Xia Li, Xi Yao
Abstract: The broad strong red emission in Pr3+ doped MgAl2O4 phosphor powders have been synthesized by conventional solid state reaction in air. The temperature dependence of particle size and structural phase were investigated. The intense red emission of the phosphors is observed under 250-350 nm excitation, which cover the spectrum of Ultraviolet. The optimal emission intensity was obtained when Pr doping level was 0.002mol. The lifetime decay curves with different concentrations and a possible mechanism were also studied.
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Authors: K.M. Christopher Chin, K.Y. Sara Lee, C.Y. Tan, Ramesh Singh, W.D. Teng
Abstract: Talc and magnesium oxide are used to prepare forsterite (Mg2SiO4) powder by solid-state reaction with ball milling method. The samples were sintered at temperature 1200°C, 1300°C, 1400°C and 1500°C with four different holding time duration 2 hours, 1 hour and 1 minute with ramp rate of 10°C/min respectively via conventional pressureless sintering method. 3 hours ball milling is sufficient to form pure forsterite without any secondary phase. Highest values for fracture toughness (3.8 MPa.m1/2) and Vickers micro-hardness (5.0 GPa) recorded with sintering temperature 1500°C with 1 hour holding time which makes forsterite suitable potential for biomedical application.
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