Walter de Gruyter GmbH

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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
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 va...... 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
Structure and hyperfine interactions in multiferroic Aurivillius Bi m+1Ti3Fe m−3O3m+3 compounds prepared by mechanical activation
Walter de Gruyter GmbH - Tập 32 - Trang 676-681 - 2014
Mariusz Mazurek, Dariusz Oleszak, Dionizy Czekaj
The aim of the study was to determine the structure and hyperfine interactions of Bi m+1Ti3Fe m−3O3m+3 multiferroic Aurivillius compounds prepared by mechanical activation process. X-ray diffraction and Mössbauer spectroscopy were applied as complementary methods. After the process of mechanical milling, desired Aurivillius phases were not formed, thus, thermal ...... hiện toàn bộ
Deep levels in GaN studied by deep level transient spectroscopy and Laplace transform deep-level spectroscopy
Walter de Gruyter GmbH - Tập 31 - Trang 572-576 - 2013
Paulina Kamyczek, Ewa Placzek-Popko, Eunika Zielony, Zbigniew Zytkiewicz
In this study we present the results of investigations on Schottky Au-GaN diodes by means of conventional DLTS and Laplace DLTS methods within the temperature range of 77–350 K. Si-doped GaN layers were grown by Molecular Beam Epitaxy technique (MBE) on sapphire substrates. DLTS signal spectra revealed the presence of four majority traps: two hightemperature and two low-temperature peaks. Using LD...... hiện toàn bộ
Silicon carbonitride layers deposited on titanium and polyurethane by PACVD method
Walter de Gruyter GmbH - Tập 31 - Trang 476-483 - 2013
Jadwiga Konefał-Góral, Anna Małek, Stanisława Kluska, Witold Jastrzębski, Sławomir Zimowski, Stanisława Jonas, Jerzy Lis
This work reports the results concerning formation and tribological properties of SiC x N y (H) layers deposited on Ti Grade 2 and polyurethane foil. Depending on the substrate, two variants of PACVD were used. The SiC x N y (H) layers on titanium were deposited w...... hiện toàn bộ
Low-temperature synthesis of zeolite from perlite waste — Part I: review of methods and phase compositions of resulting products
Walter de Gruyter GmbH - Tập 32 - Trang 503-513 - 2016
Magdalena Król, Justyna Morawska, Włodzimierz Mozgawa, Waldemar Pichór
In this paper a review of the recent studies on the synthesis of zeolites from expanded perlite under hydrothermal conditions is presented. Attention is paid to possible outcomes of synthesis from low cost glass material, such as perlite. The study also investigates the phase composition of zeolitic materials obtained by modification of by-product derived from an expanded perlite production proces...... hiện toàn bộ
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