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Miyazaki Reona Sakaguchi Isao Hihara Takehiko 《Journal of Solid State Electrochemistry》2021,25(6):1927-1936
Journal of Solid State Electrochemistry - In the present work, the conduction ions in 15NaI∙LiBH4 are investigated by secondary ion mass spectroscopy (SIMS) and galvanostatic measurements. An... 相似文献
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Self-consistent calculations have been performed to obtain the wave functions and energy subbands of the two-dimensional electrons confined in a single quantum well of a AlxGa1?xAs/GaAs/AlxGa1?xAs heterostructure. The wave functions of the two-dimensional electron gas are found to be easily controlled by an external gate voltage applied between the AlGaAs-barriers, indicating a capability of fabricating a novel quantum well device, a modulation-doped single quantum well transistor. 相似文献
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D.L. Peng T.J. Konno K. Wakoh T. Hihara K. Sumiyama 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,16(1):329-332
Cluster-cluster coalescence process of monodispersed Co clusters with mean diameter d = 8.5 and 13 nm deposited a plasma-gas-condensation-type cluster beam deposition system was investigated by in situ electrical conductivity measurements and ex situ scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and analyzed by percolation concept. The electrical
conductivity measurement and TEM observation indicated that, below temperature T≈ 100°C, the Co clusters in the assemblies maintain their original structure as deposited at room temperature, while that the inter-cluster
coalescence takes place at T > 100°C, although the size distribution and the interface morphology of the clusters showed no marked change at substrate temperatures
T
s≤200°C.
Received 29 November 2000 相似文献
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D. L. Peng H. Yamada K. Sumiyama T. Uchida T. Hihara 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2005,34(1-3):173-176
High-density, magnetically soft Fe cluster-assembled
films were obtained at room temperature by an energetic cluster deposition.
Size-monodispersed Fe clusters with the mean cluster size d = 9, 13 and 16 nm
were produced using a plasma-gas-condensation technique. Ionized clusters in
cluster beam were accelerated electrically and deposited onto the substrate
together with neutral clusters from the same cluster source. The morphology,
microstructure and magnetic properties of the cluster-assembled films have
been studied by an atomic force microscopy, scanning electron microscopy,
transmission electron microscopy, and superconducting quantum interference
device magnetometer. By increasing the impact energy of the ionized clusters
up to 0.6 eV/atom, the Fe cluster-assembled film has a packing fraction of
0.86±0.03, and reveals a soft magnetic behavior. In addition, it is
found that oxidization of the cluster-assembled films is remarkably
suppressed with the increase in the density of the films. 相似文献
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The zero-field 153Eu NMR in EuSe has been observed as a function of the pressure up to 14 kbar in the temperature range between 1.7 and 4.2 K. A sequent magnetic phase transition of NSNS-NNS-NNSS-NNN occurs with pressure at 1.7 K. In the NNSS state (2.0 ? P ? 4.8 kbar) the NMR frequency v is insensitive to the pressure. In the ferromagnetic state (P ? 4.8 kbar) v depends remarkably on the pressure, and the exchange interaction between the nearest Eu neighbours J1 is shown to increase rapidly with decreasing the Eu-Eu distance. The pressure dependences of the Eu hyperfine field suggest that the magnetic moment of a Eu2+ ion in the ferromagnetic state under pressure is smaller than the ideal saturation value at 0 K. 相似文献
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L. S. Wang R. T. Wen Y. Chen G. H. Yue D. L. Peng T. Hihara 《Applied Physics A: Materials Science & Processing》2011,103(4):1015-1020
The magnetic, electrical and optical properties of nanoparticle systems often depend on the size and size distribution of nanoparticles. In order to optimize those properties of nanoparticle-assembled materials, only varying the mean size of nanoparticles was not enough, and narrowing the size distribution was also of immense importance. In this study, uniform-sized Fe nanoparticles with different diameters were prepared using a magnetron sputtering combined with inert gas condensation technique. The size and morphology of nanoparticles were observed by transmission electron microscopy (TEM). The statistic results revealed that the size of Fe nanoparticles increased with increasing the flow rate of Ar gas, but a reverse trend was observed when increasing the flow rate of He gas. By adjusting the flow rate of Ar and He gases, uniform-sized Fe nanoparticles with diameter ranging from 6 to 13?nm were obtained. Moreover, the size effects on the electrical and magnetic properties of Fe nanoparticle-assembled films with thickness of about 500?nm were also investigated. The magnetic properties showed that the coercivity increased with increasing the nanoparticle size. The in-situ resistance measurement results of Fe nanoparticle assembled-films also showed a size-dependent behavior. 相似文献
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Sumiyama Kenji Katoh Ryoji Kadowaki Satoshi Hihara Takehiko 《Journal of nanoparticle research》2010,12(7):2589-2596
Journal of Nanoparticle Research - Using an improved plasma gas condensation cluster deposition system, Fe and Si clusters are prepared by a single glow discharge source and Fe/Si hybrid clusters... 相似文献
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Miyazaki Reona Hiroi Satoshi Miyazaki Hidetoshi Hihara Takehiko 《Journal of Solid State Electrochemistry》2022,26(8):1577-1583
Journal of Solid State Electrochemistry - The effects of ball milling on the ionic conduction properties of LiI are investigated. It is found that ball milling drastically increased the... 相似文献