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Journals

Characterization of the Mirror Region With Atomic Force Microscopy

February 19, 2017

Author(s)

Sheldon M. Wiederhorn, Jose Lopez-Cepero, Jay S. Wallace, Jean-Pierre Guin, Theo Fett

In this paper we use atomic force microscopy to investigate the roughness of the mirror region in silica glass. We demonstrate a decrease in surface RMS...

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...

Low-Thermal-Conductivity Plasma-Sprayed Thermal Barrier Coatings With Engineered Microstructures

February 19, 2017

Author(s)

Amol Jadhav, N P. Padture, Eric Jordan, Maurice Gell, Pilar Miranzo, Lin-Sien H. Lum

The solution precursor plasma spray (SPPS) process has been used to deposit ZrO2-7wt%Y2O3 (7YSZ) thermal barrier coatings (TBCs) that contain alternate layers...

In Situ Ultra-Small-Angle X-Ray Scattering From Dislocation Structures in Plastically Deformed Single-Crystal Aluminum

February 19, 2017

Author(s)

Lyle E. Levine, Gabrielle G. Long

Ultra-small-angle x-ray scattering data were obtained from a single-crystal Al sample deformed in situ at strains up to 18 %. High sensitivity to the resulting...

Flux-Pinning of Bi₂Sr₂CaCu₂O₈ High T_c Superconducting Tapes Utilizing (Sr,Ca)₁₄Cu₂₄O₄₁ and Sr₂CaAl₂O₆ Defects

February 19, 2017

Author(s)

T J. Haugan, Winnie Wong-Ng, Lawrence P. Cook, L Swartzendruber, H J. Brown, D T. Shaw

Efforts to improve the magnetic flux-pinning properties of Bi 2Sr 2Ca 1Cu 20 8 +δ /Ag (2212/Ag) tape conductors utilizing (Srd1-x^Ca x)14Cu 240 41+δ (014x24)...

Contact Damage Produced in Si and MgO by Nanoindentation

February 19, 2017

Author(s)

B Hockey

TEM has been used to characterize the defect structures produced in Si and Mgo by Berkovich indentation at loads ranging from 0.1 mN to 5 mN. Plane-section...

Defect Structures Produced in Silicon and MgO by Nanoindentation

February 19, 2017

Author(s)

B Hockey

TEM has been used to characterize residual defect structures produced in 111} Si and 001] MgO by Berkovich nanoindentation at loads ranging from 5 mN to 0.1 mN...

Domain Pinning in Lead Zirconate Titanate Thin Films

February 19, 2017

Author(s)

J Blendell, Grady S. White

Atomic force microscopy measurements of the piezoelectric response of a lead zirconate titanate (PZT) thin film detect domain pinning sites along grain...

Anomalous Lattice Expansion of Coherently Strained SrTiO₃ 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...

Simulations of Microstructural Evolution: Anisotropic Growth and Coarsening

February 19, 2017

Author(s)

A R. Roosen, W Carter

Two-dimensional calculations of anisotropic growth and coarsening are illustrated. This model is intended to simulate the development of microstructure in...

Practical Intrinsic-Error Bounds for X-Ray Computed Tomography

February 19, 2017

Author(s)

R D. Spal

Images produced by x-ray computed tomography contain intrinsic error due to the limited spatial resolution of the technique. Two bounds on the mean intrinsic...

NIST Researcher Highlights Challenges of Talking Ceramics

February 19, 2017

Author(s)

Terrell A. Vanderah

In the last three decades, communications technologieshave been completely transformed by the wirelessrevolution. Devices such as cell phones are now socommon...

Crystal Chemistry and Microwave Dielectric Properties of Ba₃Mnb_2-xSb_xO₉(M=Mg, NI, Zn)

February 19, 2017

Author(s)

M W. Lufaso, E Hopkins, S M. Bell, A Llobet

The effect of Sb5+ substitution on the crystal chemistry and dielectric properties of Ba3MNb2-xSbxO9 (M = Mg, Zn, Ni) was investigated using a combination of X...

Enhancement of Mercuric Iodide for High Energy Radiation Detectors via Diffraction Imaging

February 19, 2017

Author(s)

B W. Steiner, P L'Hostis, U Laor, L van den Berg

NASA=S interest in tracing the structural origins of the superior electronic performance of mercuric iodide crystals grown in microgravity has led to an...

Crystallography and Crystal Chemistry of (Ba_1-xSr_x)2TiO₄

February 19, 2017

Author(s)

Winnie Wong-Ng, James A. Kaduk, Debra L. Kaiser, Julia Frank

This paper reports an investigation of the homogeneity range, crystal chemistry and crystallography of a technologically-important (Ba2-xSrx)TiO4 solid solution...

Modeling of Nematic Liquid Crystal Alignment on Patterned Substrates

February 19, 2017

Author(s)

Hemang J. Shah, A K. Fontecchio, Robin L. Selinger, Lin-Sien H. Lum

Effect of Abrasive Wear on Interfacial Shear Sliding Resistance in SiC Fiber-Reinforced Al₂0₃

February 19, 2017

Author(s)

Kakisawa, Y Kagawa, Lin-Sien H. Lum

Interface wear behavior and its effects on the shear frictional sliding resistance in fiber-reinforced ceramics have been studied using SiC fiber (SCS-6)...

Subsolidus Phase Relationships of the BaO-R₂O₃-CuO_z (R=Tm and Yb) Systems Under Carbonate-Free Conditions at p_o2 = 100 Pa, and T = 750 Degree Celcius and 810 Degree Celcius

February 19, 2017

Author(s)

Winnie Wong-Ng, Zhi Yang, Lawrence P. Cook

For applications of phase equilibria to coated conductor processing, phase diagrams constructed under carbonate-free conditions should be employed. Using...

Multiscale Roughness and Stability of Superhydrophobic Biomimetic Interfaces

February 19, 2017

Author(s)

Michael Nosonovsky

Stability of a composite interface (CI) of roughness-induced superhydrophobic surfaces is studied. In order to have high contact angle and low contact angle...

Workshop on Purity and Dispersion Measurement Issues of Single Wall Carbon Nanotubes (SWCNTs)

February 19, 2017

Author(s)

Stephen W. Freiman, Richard R. Cavanagh, C K. Montgomery, Thomas J. Shaffner, S Arepalli, B Files, P Nikolaev

This document is an executive summary of a workshop organized jointly by the National Aeronautics and Space Administration, Lyndon B. Johnson Space Center (NASA...

Negative Pressure in Water Capillary Bridges at Nanocontacts

February 19, 2017

Author(s)

Seung H. Yang, Michael Nosonovsky, Huan Zhang, Koo-Hyun Chung

Negative Laplace pressure may develop inside a water capillary bridge formed between two bodies and contribute to the force required to pull them apart. Because...

Tensile Creep of a Commercial-Grade Silicon Nitride, AS800: Limitation of Norton's Relationship

February 19, 2017

Author(s)

H A. Maupas, B Hockey, Sheldon M. Wiederhorn

Creep experiments were conducted on a commercial grade of silicon nitride (AS800) over a wide range of temperatures and stresses: 1200oC to 1370oC; 50 MPa to...

Comparison of Tensile Creep Measurements on Buttonhead and Pin-Loaded Specimens of Some Silicon Nitride Ceramics

February 19, 2017

Author(s)

Ralph Krause

Tensile-creep measurements by two experimental techniques on two kinds of silicon nitride ceramics were compared statistically. Some of the measurements were...

Optical and Structural Studies of Strain-Relaxed InxGa1-xN Films on GaN/sapphire with 0.04

February 19, 2017

Author(s)

Larry Robins, J T. Armstrong, Mark D. Vaudin, Charles E. Bouldin, Joseph Woicik, Albert J. Paul, W. R. Thurber, Ryna B. Marinenko

The structures of a set of InxGa1-xN films grown by atmospheric-pressure MOCVD onGaN buffer layers on c-plane sapphire, with compositions in the range 0.04 x ...

Simulation of PNR-PNR Correlations in Pb(Sc_1/2Nb_1/2)O₃; Support/Implications for the Spherical Random Bond Random Field Model

February 19, 2017

Author(s)

Benjamin P. Burton, Eric J. Cockayne, U Waghmare

First principles based molecular dynamics simulations were performed on a 40^3^ unit cell system of stoichiometry Pb(Sc 1/2Nb 1/2)O 3 (PSN). To imitate a...

Green Body Density Measurement Techniques

February 19, 2017

Author(s)

P Pei, J Anderson, M C. Bhardwaj, Dennis B. Minor, T Thornton

Green body density measurement techniques were investigated and compared. The measurement techniques investigated include mass-volume measurement, mercury...

Hierarchical Roughness Makes Superhydrophobic States Stable

February 19, 2017

Author(s)

Michael Nosonovsky, Bharat Bhushan

Roughness enhances hydrophobicity of a solid surface leading to high contact angles with water. To achieve low contact angle hysteresis along with a high...

Analytical Model for Residual Stresses in Polymeric Containers During Cryogenic Storage of Hematopoietic Stem Cells

February 19, 2017

Author(s)

D M. Saylor, Martin McDermott, Lin-Sien H. Lum

Hematopoietic stem cell (HSC) therapy can significantly lower instances of infection in chemotherapy patients by accelerating the recovery of white blood cells...

Enviromental Concerns Facing the Ceramics Industry

February 19, 2017

Author(s)

Stephen W. Freiman

Over the past few years, there has been increased attention paid by ceramic manufacturers in the United States to environmental issues facing their businesses...

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...

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