Journal of Materials Research
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Synthesis and characterization of nitrides of iridium and palladium
Journal of Materials Research - - 2008
We describe the synthesis of nitrides of iridium and palladium using the laser-heated diamond anvil cell. We have used the in situ techniques of x-ray powder diffraction and Raman scattering to characterize these compounds and have compared our experimental findings where possible to the results of first-principles theoretical calculations. We suggest that palladium nitride is isostructural with p...... hiện toàn bộ
Measurement of electromigration activation energy in eutectic SnPb and SnAg flip-chip solder joints with Cu and Ni under-bump metallization
Journal of Materials Research - Tập 25 - Trang 1847-1853 - 2011
Electromigration activation energy is measured by a built-in sensor that detects the real temperature during current stressing. Activation energy can be accurately determined by calibrating the temperature using the temperature coefficient of resistivity of an Al trace. The activation energies for eutectic SnAg and SnPb solder bumps are measured on Cu under-bump metallization (UBM) as 1.06 and 0.8...... hiện toàn bộ
Bombarding energy dependence of bonding structure in amorphous carbon interlayer and its effect on diamond nucleation
Journal of Materials Research - Tập 14 - Trang 2029-2035 - 2011
The bombarding energy dependence of bonding structure in amorphous carbon interlayer and its effect on diamond nucleation density (Nd) were studied. Amorphous carbon (a-C) interlayer was deposited by magnetron sputtering. Interestingly, the intensity ratio (ID/IG) of the D band (∼1400 cm−1) to the G band (∼1570 cm−1) in the Raman spectra and the optical band gap of the a-C film were found to be in...... hiện toàn bộ
Nanoindentation cracking in gallium arsenide: Part II. TEM investigation
Journal of Materials Research - Tập 28 - Trang 2799-2809 - 2013
The nanoindentation fracture behavior of gallium arsenide (GaAs) is examined from two perspectives in two parent papers. In the first paper (part I), we address the morphology of the crack field induced by different types of indenters by means of in situ nanoindentation inside a scanning electron microscope (SEM) and of cleavage cross-sectioning techniques. In the present paper (part II), we inves...... hiện toàn bộ
Optical propagation loss reduction in ZnO thin films under CO2 laser treatment
Journal of Materials Research - Tập 5 - Trang 1929-1932 - 2011
The reduction of propagation losses in ZnO thin film waveguides for integrated optics after CO2 laser treatment is studied. RHEED patterns show that the measured decrease of optical losses is accompanied by an increase of ordering after the laser treatment. The reordering depends on the initial film state and the laser irradiation conditions.
In situ thermographic observations on the compression behavior of a relaxed Zr-based bulk-metallic glassUsing an infrared camera, the plastic deformation of a relaxed Zr52.5 Cu17.9 Ni14.6 Al10.0 Ti5.0 bulk-metallic glass in a moderately high strain rate compression was observed in situ. The specimen exhibits an inhomogeneous deformation, which is manifested by serrated plastic flow, shear ban... ... hiện toàn bộ
Journal of Materials Research - - 2007
Metastable phase formation by ion mixing of Nb–Al multilayers
Journal of Materials Research - Tập 4 - Trang 1385-1392 - 2011
The structure of Nb–Al thin films after ion mixing was studied for compositions from 20 to 85 at. % Al as a function of temperature in the range between 40 and 620 K. The phase formation was determined by transmission electron microscopy. At lower temperatures, only supersaturated bcc-solid solution, NbAl, and amorphous phase were found throughout the studied composition range. Besides these phase...... hiện toàn bộ
Shear band widening mechanism in Ti–6Al–4V under high strain rate deformation
Journal of Materials Research - Tập 35 - Trang 1623-1634 - 2020
In this study, mechanical properties and microstructural investigation of Ti64 at high strain rate are studied using a split-Hopkinson pressure bar method under compression for temperatures up to 800 °C. Flow softening in the mechanical response of material to such loading conditions hints at instability in compression, which increases with an increase in temperature. Microstructural characterizat...... hiện toàn bộ
Mesoporous silica beads encapsulated with functionalized palladium nanocrystallites: Novel catalyst for selective hydrogen evolution
Journal of Materials Research - Tập 32 - Trang 3574-3584 - 2017
2-(3,4 epoxycyclohexyl)ethyltrimethoxysilane (EETMS)/3-glycidoxypropyltrimethoxysilane (GPTMS) mediated, in situ synthesis of functional palladium (Pd) nanocomposites over the graphene oxide (GO) surface is reported. The prepared nanocomposites viz, Pd/EETMS, Pd/GPTMS, Pd/GO/EETMS, and Pd/GO/GPTMS, are encapsulated into mesoporous (2–10 nm) silica-alginate beads to primarily serve the development ...... hiện toàn bộ
Analysis of stability of a planar solid-liquid interface in a dilute binary alloy
Journal of Materials Research - Tập 5 - Trang 223-228 - 2011
The question of stability of a planar solid-liquid interface in undercooled pure and alloy melts has been reconsidered without the restrictive assumption of no heat flow in the solid made in earlier works. The modified analysis indicates that provided the thermal gradient on the solid side of the interface, Gs, is positive, stability can be achieved in an undercooled alloy melt for growth rates R>...... hiện toàn bộ
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