Browsing Faculty Works, Materials Science and Engineering (MSE) by Title
Now showing items 149-168 of 362
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Implications of ab initio energetics on the thermodynamics of Fe-Cr alloys
(AIP Publishing, 2006-09-01)The authors analyze the implications of the recently reported results of ab initio calculations of formation energies of the Fe-Cr alloy. The formation energies show a change in sign from negative to positive as Cr composition ... -
Importance of structural irregularity on dielectric loss in (1-x)Pb(Mg1/3Nb2/3)O-3-(x)PbTiO3 crystals
(AIP Publishing, 2002-06-01)The dielectric properties of (1-x)Pb(Mg1/3Nb2/3)O-3-(x)PbTiO3 (PMN-PT) crystals have been investigated over a temperature range of 4 to 450 K at various frequencies. At low temperatures, an unusual frequency dependent ... -
Improvement in the electrical properties in Pt/Pb(Zr0.52Ti0.48)O-3/Pt ferroelectric capacitors using a wet cleaning method
(American Institute of Physics, 1999-12-01)A wet cleaning solution was designed to specifically eliminate nonferroelectric phases, such as pyrochlore, PbO, and the etching damaged layer. Scanning electron microscopy pictures clearly showed that treatment with the ... -
Improvement of temperature-stability in a quantum well laser with asymmetric barrier layers
(AIP Publishing, 2012-01-01)We fabricated and tested a quantum well laser with asymmetric barrier layers. Such a laser has been proposed earlier to suppress bipolar carrier population in the optical confinement layer and thus to improve temperature-stability ... -
In situ investigation of stress-induced martensitic transformation in granular shape memory ceramic packings
(2019-04-15)Stress-induced martensitic transformation can occur in granular shape memory materials when individual particles experience high stresses and transform from a high-symmetry austenite phase to a low symmetry martensite ... -
Influence of dc-bias on phase stability in Mn-doped Na0.5Bi0.5TiO3-5.6 at. %BaTiO3 single crystals
(AIP Publishing, 2009-10-01)Mn-doped Na0.5Bi0.5TiO3-5.6 at. %BaTiO3 (Mn:NBT-5.6% BT) single crystals were grown by a top-seeded solution growth method. Tetragonal and rhombohedral phases were found to coexist in the as-grown condition. The dielectric ... -
The influence of Mn substitution on the local structure of Na0.5Bi0.5TiO3 crystals: Increased ferroelectric ordering and coexisting octahedral tilts
(American Institute of Physics, 2012-03-15)The ferroelectric domain structure of pure Na1/2Bi1/2TiO3 (NBT) and 1 at.% Mn-doped NBT (Mn-NBT) crystals was investigated by piezoresponse force microscopy. The correlation length of the polar regions was found to increase ... -
Infrared activity in the Aurivillius layered ferroelectric SrBi2Ta2O9
(American Physical Society, 1998-03-01)Experimental studies were carried out on infrared-active phonons in the Aurivillius ferroelectric SrBi2Ta2O9 (SBT), using reflectivity measurements (down to 200 cm(-1)) and transmission measurements (down to 100 cm(-1)) ... -
Initial growth of tin on niobium for vapor diffusion coating of Nb3Sn
(2019-04)Nb3Sn offers significant potential to exceed the performance of niobium for superconducting radio frequency accelerator cavities. The most promising path toward deployment is by tin vapor diffusion coating of Nb cavity ... -
Interatomic potentials for monoatomic metals from experimental data and ab initio calculations
(American Physical Society, 1999-02-01)We demonstrate an approach to the development of many-body interatomic potentials for monoatomic metals with improved accuracy and reliability. The functional form of the potentials is that of the embedded-atom method, but ... -
Interface structure and adhesion of wafer-bonded GaN/GaN and GaN/AlGaN semiconductors
(American Institute of Physics, 2004-02-01)Material integrations of GaN/GaN and Al0.25Ga0.75N/GaN semiconductors through wafer bonding technology were reported in this work. The wafer surface and interface microstructures were characterized by scanning electron ... -
Intergranular fracture in nanocrystalline metals
(American Physical Society, 2002-08-01)Crack propagation studies in nanocrystalline Ni samples with mean grain sizes ranging from 5 to 12 nm are reported using atomistic simulations. For all grain sizes pure intergranular fracture is observed. Intergranular ... -
Intermediate ferroelectric orthorhombic and monoclinic M-B phases in [110] electric-field-cooled Pb(Mg1/3Nb2/3)O-3-30%PbTiO3 crystals
(American Physical Society, 2005-08-01)Structural phase transformations of [110] electric-field-cooled Pb(Mg1/3Nb2/3)O-3-30%PbTiO3 (PMN-30%PT) crystals have been performed by x-ray diffraction. A phase sequence of cubic (C)-> tetragonal (T)-> orthorhombic (O)-> ... -
Interplay between static and dynamic polar correlations in relaxor Pb(Mg1/3Nb2/3)O-3
(American Physical Society, 2010-04-01)We have characterized the dynamics of the polar nanoregions in Pb(Mg1/3Nb2/3)O-3 through high-resolution neutron-backscattering and spin-echo measurements of the diffuse-scattering cross section. We find that the ... -
Investigation into Polyurethane at Varying Dose Rates of Ionizing Radiation for Clinical Application
(Hindawi, 2018-10-01)Polyurethanes (PUs) are commonly used materials for medical devices. These devices are exposed repeatedly to radiation when patients undergo radiotherapy treatments. It has been found that peripherally inserted central ... -
Investigation of external noise and its rejection in magnetoelectric sensor design
(American Institute of Physics, 2009-07-15)Laminated magnetoelectric (ME) composites consisting of magnetostrictive and piezoelectric layers are an important class of magnetic sensors. Here, we will present a means to design ME sensors with in-built capabilities ... -
Investigation of helium at a Y2Ti2O7 nanocluster embedded in a BCC Fe matrix
(Royal Society of Chemistry, 2016-10-18)Nanostructured ferritic alloys (NFAs) are prime candidates for structural and first wall components of fission and fusion reactors. The main reason for this is their ability to effectively withstand high concentrations of ... -
Investigation of polarization switching in (001)(c), (110)(c), and (111)(c) oriented Pb(Zn1/3Nb2/3)O-3-4.5%PbTiO3 crystals
(American Institute of Physics, 2004-05-15)The dynamics of polarization switching have been investigated over extremely broad time (10(-8)Ion transport and storage of ionic liquids in ionic polymer conductor network composites
(AIP Publishing, 2010-05-01)We investigate ion transport and storage of ionic liquids in ionic polymer conductor network composite electroactive devices. Specifically, we show that by combining the time domain electric and electromechanical responses, ...Iterative approaches describing atomic diffusion in finite single‐ and two‐phase systems
(American Institute of Physics, 1976)Iterative solutions are given for planar one‐dimensional atomic diffusion in finite single‐ and two‐phase systems. They are usable for any continuous variation of the interdiffusion coefficient D (C) within each phase, and ...
