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The influence of boron on the adsorption of Ti and C on TiC surfaces
Walter de Gruyter GmbH - Tập 32 - Trang 112-120 - 2014
Xiaoliang Fan, Haimin Ding, Kaiyu Chu
The first-principles calculations have been performed to study the influence of boron on the adsorption of Ti and C on different TiC surfaces. It is found that boron can be adsorbed on both TiC (001) and (111) surfaces. When boron is present and carbon supply is high during the preparation of TiC, boron can bond with carbon atoms to form B-C clusters on (001) surface, but the formation of them is ... hiện toàn bộ
First-principles investigation of the structural stability and electronic properties of Pd doped monoclinic Cu6Sn5 intermetallic compounds
Walter de Gruyter GmbH - Tập 32 - Trang 592-596 - 2014
Wei-Quan Shao, Wen-Cai Lu, Sha-Ou Chen
Tri-layer Au/Pd/Ni(P) films have been widely used as surface finish over the Cu pads in high-end packaging applications. It was found that a thin (Cu,Pd)6Sn5 IMC layer was beneficial in effective reducing inter-diffusion between a Cu substrate and a solder, and therefore the growth of the IMC layer and the EM (electromigration) processes. In this study, the structural properties and phase stabilit... hiện toàn bộ
Analysis of electromigration phenomenon in thick-film and LTCC structures at elevated temperature
Walter de Gruyter GmbH - Tập 32 - Trang 247-251 - 2014
Damian Nowak, Andrzej Stafiniak, Andrzej Dziedzic
Studies on electromigration phenomenon in thick-film structures on alumina and LTCC substrates are presented in this paper. The effects of storage of Au and Ag electrode patterns in temperature range up to 300 °C under voltage bias were examined. The leakage characteristics of electrodes with 100 μm spacing at 50 V dc bias as a function of time and temperature are presented and analyzed. Scanning ... hiện toàn bộ
Synthesis of maghemite (γ-Fe2O3) nanoparticles by thermal-decomposition of magnetite (Fe3O4) nanoparticles
Walter de Gruyter GmbH - Tập 31 - Trang 264-268 - 2013
M. Aliahmad, N. Nasiri Moghaddam
In this research work, we prepared γ-Fe2O3 nanoparticles by thermal-decomposition of Fe3O4. The Fe3O4 nanoparticles were synthesized via co-precipitation method at room temperature. This simple, soft and cheap method is suitable for preparation of iron oxide nanoparticles (γ-Fe2O3; Fe3O4). The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), t... hiện toàn bộ
Ferromagnetic and spin wave resonances in thin layer of expanded austenite phase
Walter de Gruyter GmbH - Tập 32 - Trang 198-205 - 2014
J. Typek, N. Guskos, G. Zolnierkiewicz, P. Berczynski, A. Guskos, J. Baranowska, S. Fryska
Four samples of austenite coatings deposited by reactive magnetron sputtering on silicon substrate at four different temperatures and pressures were investigated by ferromagnetic resonance (FMR) method at room temperature. The expanded austenite phase S (γ N ) layers with thickness in the 160–273 nm range and concentration of magnetic atoms: 72 % Fe, 18 % Cr and 10 % Ni, were obtained. The coating... hiện toàn bộ
Influence of sintering temperature on secondary phases formation and microwave dielectric properties of Ca2Ce2Ti5O16 ceramics
Walter de Gruyter GmbH - - 2014
Abdul Manan, Sami Ullah Khan, Ibrahim Qazi
Abstract Ca2Ce2Ti5O16 dielectric ceramics prepared by conventional solid-state ceramic route was investigated. Phase composition and microwave dielectric properties were measured using XRD and Vector network analyzer, respectively. XRD analysis of the calcined and sintered samples revealed the formation of CeO2 and another unidentified phase (that vanished at ≥ 1400 °C) as secondary phases along w... hiện toàn bộ
Optical properties of the Al2O3/SiO2 and Al2O3/HfO2/SiO2 antireflective coatings
Walter de Gruyter GmbH - Tập 32 - Trang 80-87 - 2014
Konstanty Marszałek, Paweł Winkowski, Janusz Jaglarz
Investigations of bilayer and trilayer Al2O3/SiO2 and Al2O3/HfO2/SiO2 antireflective coatings are presented in this paper. The oxide films were deposited on a heated quartz glass by e-gun evaporation in a vacuum of 5 × 10−3 [Pa] in the presence of oxygen. Depositions were performed at three different temperatures of the substrates: 100 °C, 200 °C and 300 °C. The coatings were deposited onto optica... hiện toàn bộ
Electronic structure and possible martensitic transformation in Ni2FeIn alloy
Walter de Gruyter GmbH - Tập 32 - Trang 396-401 - 2016
Yungao Gu, Fang Xue, Guoqing Zhao, Guodong Liu, Yang Liu, Songtao Li
The electronic structure and magnetic properties of Heusler alloys (Ni2FeIn) have been studied by first principle calculations. The possible tetragonal martensitic transformation has been predicted and the structure optimization was made on cubic austenitic Ni2FeIn in Cu2MnAl type. The equilibrium lattice constant of austenitic Ni2FeIn is 6.03 Å. In tetragonal phase, the global energy minimum occu... hiện toàn bộ
Structural properties of Sb- and Te-based binary compounds: Spin-orbit effect
Walter de Gruyter GmbH - Tập 31 - Trang 133-138 - 2013
Y. Al-Douri
The band structure of AlSb, GaSb, ZnTe and CdTe is calculated using the empirical pseudopotential method (EPM) coupled with spin-orbit (SO) splitting. We applied our empirical model of bulk modulus with SO effect. It has been noticed that SO has a crucial effect on the band structure of these compounds but does not influence the structural phase transition. The calculated results are in good agree... hiện toàn bộ
Preparation, characterization and photocatalytic performances of materials based on CS2-modified titanate nanotubes
Walter de Gruyter GmbH - Tập 31 - Trang 531-542 - 2013
Huiqin An, Xiaojing Hu, Baolin Zhu, Juanjuan Song, Weiling Zhao, Shoumin Zhang, Weiping Huang
CS2-modified titanate nanotubes (CS2/TiO2-NTs) are fabricated by reaction of CS2 and Ti-O−Na+ species on titanate nanotubes. Pb2+ ions are coated on the modified nanotubes by ion exchange (Pb/CS2/TiO2-NTs). The products are characterized by means of nitrogen adsorption-desorption isotherms at 77 K (BET method), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), X-ray d... hiện toàn bộ
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