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W. Rattanasakulthong C. Sirisathitkul 《Applied Physics A: Materials Science & Processing》2006,83(1):77-81
Thermal and magnetotransport properties of mechanically alloyed Co30Cu70 powders of three different milling times are studied. Both milling and annealing bring about oxidation of the samples. The powders show exothermic behaviors corresponding to the lattice-recovery process. Different milling times and annealing temperatures give rise to different exothermic peaks because of oxidation and the cluster distribution. At room temperature, the compressed powders show, on average, up to 11% giant magnetoresistance (GMR) under 10 kOe with sharp switching. The results may be understood in terms of spin-dependent scattering across Co/oxide/Cu interfaces. Annealing reduces the resistance but does not promote the GMR. By annealing at 400 °C, the GMR is entirely suppressed as the magnetic content is largely replaced by oxides. PACS 72.15.Eb; 75.47.De; 75.47.Np 相似文献
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Synchrotron XANES and ED‐XRF analyses of fine‐paste ware from 13th to 14th century maritime Southeast Asia
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Jaru Jutimoosik Chitnarong Sirisathitkul Wanida Limmun Rattikorn Yimnirun Wannasarn Noonsuk 《X射线光谱测定》2017,46(6):492-496
The combination of energy dispersive X‐ray fluorescence (ED‐XRF) and synchrotron X‐ray absorption near‐edge structure (XANES) provides the detailed composition of fine‐paste ware (FPW) kendis, dated back to 13th–14th century maritime Southeast Asia. Sources of clay and production sites were classified according to Al2O3, SiO2, α‐Fe2O3 and γ‐Fe2O3 as well as trace elements. The similarities based on these components provided another evidence of a trade route between Kota Cina in North Sumatra of Indonesia and Kok Moh on Satingphra Peninsula, a well‐known production area in present‐day Thailand. In additions, the uniquely large contribution of α‐Fe2O3 in XANES spectra suggests that Nakhon Si Thammarat province of Thailand could also be one of FPW production areas in maritime Southeast Asia. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
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Pharunee Sarmphim Komkrich Chokprasombat Chitnarong Sirisathitkul Yaowarat Sirisathitkul Kunthaya Ratchaphonsaenwong Supree Pinitsoontorn Phimphaka Harding 《Journal of Cluster Science》2016,27(1):1-8
The liquid–air interface is demonstrated as a method to assemble nanoparticles synthesized from the reaction between iron (III) dibenzoylmethane (Fe(dbm)3) and platinum acetylacetonate (Pt(acac)2) into a long range monolayer. These surface-modified particles have average Fe to Pt atomic ratio of 0.77:1. The increase in surfactants further reduces the Fe:Pt ratio and increases the particle diameter to over 4 nm. The self-assembled pattern of FePt-based nanoparticles can be enhanced by dropping nanoparticle suspensions on the surface of diethelyne glycol (DEG). The concentrations of these nanoparticle suspensions in hexane from 0.2 to 0.4 mg/ml can be used without the agglomeration into multilayered islands. The voids in the self-assembled monolayer on the DEG-air interface are reduced to the minimum in the case of the lowest concentration. 相似文献
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Chat Pholnak Chitnarong Sirisathitkul David J. Harding 《Journal of Physics and Chemistry of Solids》2011,72(6):817-823
The ultrasonic reaction of zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and hexamethylenetetramine (C6H12N4) was investigated by varying the concentration of the reactants, the irradiation time, and the type of sonicator. The morphology, composition, and phase structure of the products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) and ultraviolet-visible (UV-vis) spectroscopy. Octahedral zinc oxide (ZnO) micropowders were formed at low concentrations, 0.05 M, of Zn(NO3)2·6H2O and C6H12N4 in both lab-made sonicator and commercial ultrasonic bath. However, at concentrations between 0.1 and 1.0 M Zn(NO3)2-C6H12N4 mainly plate-like zinc hydroxide nitrate hydrate (Zn5(OH)8(NO3)2(H2O)2) resulted with only a small fraction of ZnO, irrespective of the irradiation time employed, highlighting the sensitivity of the system to the concentration of the starting materials. Heat treatment of Zn5(OH)8(NO3)2(H2O)2 at 350 °C in air affords a ZnO phase of irregular morphology. Octahedral ZnO is found to exhibit slightly lower IR absorption and similar UV absorption to that of commercial prismatic hexagonal ZnO, although an extra peak due to small quantities of Zn5(OH)8(NO3)2(H2O)2 is observed. 相似文献
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Chitnarong SirisathitkulSomkane Piromrak Pongsakorn Jantaratana 《Physica B: Condensed Matter》2011,406(2):155-158
Magnetoimpedance (MI) effect of cobalt-coated silicon steels is measured as a function of cobalt thickness (0−45 μm), DC magnetic field (0-2 kOe), frequency (1 kHz-1 MHz) and magnitude (1-20 mA) of AC current. With increase in deposition thickness, the MI ratio and the characteristic frequency are decreased because the samples are magnetically hardened by the coating. Nevertheless, cobalt deposition broadens the frequency-dependent MI curves, and the frequency range with a large MI ratio is extended. The variations of this peak width as well as the characteristic frequency and the MI ratio are explained by the skin effect and crossing effect. 相似文献
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