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Displaying 126 - 150 of 1316

High-throughput first principles search for new ferroelectrics

January 31, 2018
Author(s)
Kevin F. Garrity
We use a combination of symmetry analysis and high-throughput density functional theory calculations to search for new ferroelectric materials. We use two search strategies to identify candidate materials. In the first strategy, we start with non-polar

Correction of an adding-doubling inversion algorithm for the measurement of the optical parameters of turbid media

January 1, 2018
Author(s)
Paul Lemaillet, Catherine C. Cooksey, Jeeseong Hwang, Heidrun Wabnitz, Dirk Grosenick, Lin Yang, David W. Allen
We present broadband measurements of the optical properties of tissue-mimicking solid phantoms using a single integrating sphere to measure the hemispherical reflectance and transmittance under a direct illumination at the normal incident angle. These

Strength of Brittle Materials in Moderately Corrosive Environments

October 30, 2017
Author(s)
Robert F. Cook
The strengths of four brittle materials―cordierite glass ceramic, fused silica, silicon, and polycrystalline alumina were measured after exposure to weakly-corrosive water and moderately- corrosive buffered HF (BHF) solution. Exposure to water did not

Diffusion of water in silica: Influence of moderate stresses

August 29, 2017
Author(s)
Sheldon M. Wiederhorn, Susanne Wagner, Gabriele Rizzi, Michael J. Hoffmann, Theo Fett
Here we study the diffusive transfer of water into silica glass in the presence of externally applied stresses, and stresses caused by water induced swelling of the glass. By considering the simultaneous action of water penetration into the surface of

Blunt scratch strength of polycrystalline alumina

August 21, 2017
Author(s)
Robert F. Cook
A model for the fracture strength of brittle materials controlled by blunt (spherical) scratches is developed and compared with measurements on a polycrystalline alumina. The model is based on a residual stress-intensity factor for median cracks at

Fast-Responding Bio-Based Shape Memory Thermoplastic Polyurethanes

July 14, 2017
Author(s)
Zoran S. Petrovic, Jelena Milic, Fan Zhang, Jan Ilavsky
Fast response shape-memory polyurethanes were prepared from bio-based polyols, diphenyl methane diisocyanate and butane diol. The bio-based polyester polyols were synthesized from 9-hydroxynonanoic acid, a product obtained by ozonolysis of fatty acids

Diffusion of water in silica in the absence of stresses

April 21, 2017
Author(s)
Sheldon M. Wiederhorn
In this paper we consider the diffusion of water vapour into silica glass at relatively low temperatures, 25°C to ≈500°C. Extensive studies of such diffusion by others have shown that water diffusion from inert gases behaves differently than diffusion from

A Combinatorial Study of Metal Gate/HfO2-MOSCAPS

February 19, 2017
Author(s)
Martin L. Green, Kao-Shuo Chang, Ichiro Takeuchi, T Chikyow
Combinatorial methodology is a rapid technique for surveying new gate dielectrics and gate metal electrodes for the very complex advanced CMOS gate stack. Here, we report on a typical metal gate electrode alloy system, the Ni-Ti-Pt ternary. We have

A Re-Examination of a Specific Surface Area Research Material

February 19, 2017
Author(s)
Dennis B. Minor
Specific surface area(SSA) analysis is one of the most common, quick, and inexpensive techniques used in analytical laboratories to characterize a variety of solid materials using a variety of gases. The technique is not labor intensive, can yield results

Abrasive Machining of Glass-Infiltrated Alumina with Diamond Burs

February 19, 2017
Author(s)
L Yin, L K. Ives, S Jahanmir, E D. Rekow, E Romberg
The abrasive machining characteristics of a glass-infiltrated dry-pressed alumina used for fabrication of all-ceramic dental crowns are investigated using a high-speed dental handpiece and diamond burs containing supercoarse (180 m), fine (40 m), and

ACerS-NIST Phase Equilibria Diagrams Volume XIV Oxides

February 19, 2017
Author(s)
Robert S. Roth, Terrell A. Vanderah
This volume is the fourteenth of the topically-oriented series of phase diagram compilations and the tenth to appear since the National Institute of Standards (NIST) and the American Ceramic Society (ACerS) embarked on a jointly-sponsored expanded Ceramic

An Exception to Amontons' Law: The Friction of Carbon Surfaces in Air

February 19, 2017
Author(s)
P M. McGuiggan
The friction of carbon has been of much interest in recent years due to its good tribological properties. These properties include high wear resistance, high hardness, low friction coefficients, and low corrosion. 1 In computer hard disks, the magnetic

Angular-Momentum Resolved Partial Density of States of Rutile TiO 2 : Theory and Experiment

February 19, 2017
Author(s)
Joseph Woicik, E J. Nelson, L Kronik, M Jain, J R. Chelikowsky, D Heskett, L E. Berman, G S. Herman
Using the method of site-specific valence x-ray photoelectron spectroscopy (SSVKPS), we have experimentally determined the Ti and O partial density of occupied valence states of rutile TiO2. Excellent agreement with ab initio local density approximation

Anomalous Lattice Expansion of Coherently Strained SrTiO 3 Thin Films Grown on Si(001) by Kinetically Controlled Sequential Deposition

February 19, 2017
Author(s)
Joseph Woicik, H Li, P Zschack, E Karapetrova, P Ryan, C R. Ashman, C S. Hellberg
X-ray diffraction has been used to study the epitaxy and lattice expansion of SrTiO3 thin films grown on Si(001) by kinetically controlled sequential deposition (KCSD). Unlike films grown by traditional molecular beam epitaxy (MBE), these films have an in
Displaying 126 - 150 of 1316