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Displaying 1 - 25 of 1310

Electron Paramagnetic Resonance Study of Carbonated Hydroxyapatite Synthesized through Calcium Phosphate Cements

August 5, 2022
Author(s)
Alline F. Myers, Shozo Takagi, Stanislav Frukhtbeyn, Laurence Chow, Veronika Szalai, Lonnie Cumberland, Ileana Pazos, Eaman Karim
Ionizing radiation-induced paramagnetic defects in calcified tissues like tooth enamel are indicators of irradiation dose. Hydroxyapatite (HA), the principal constituent in these materials, incorporates a variety of anions (CO32, F, Cl, SiO44 ) and

Analytical and Numerical Analyses for Two-Dimensional Stress Transfer

October 12, 2021
Author(s)
C H. Hsueh, P Becher, Lin-Sien H. Lum, Stephen A. Langer, W Carter
Both analytical modeling and numerical simulations were performed to analyze the stress transfer in platelet-reinforced composites in a two-dimensional sense. In the two-dimensional model, an embedded elongate plate bonded to a matrix along its length

c-Axis Oriented Epitaxial BaTiO 3 Films on (001) Si

October 12, 2021
Author(s)
V Vaithyanathan, J Lettieri, W Tian, A Kochhar, H Ma, A Sharan, A Vasudevarao, J. A. Aust, Y Li, Long-Qing Chen, P Zschack, Joseph Woicik
c-axis oriented epitaxial films of the ferroelectric BaTiO3 have been grown on (001) Si by reactive molecular-beam epitaxy (MBE). The orientation relationship between the film and substrate is (001) BaTiO3 // (001) Si and [100] BaTiO3 // [110] Si. The

Characterization of New 5M and 7M Polytypes of Niobia-Doped Ca 2 Ta 2 O 7

October 12, 2021
Author(s)
I E. Grey, Robert S. Roth, W G. Mumme, J Planes, Leonid A. Bendersky, C Li, J Chenavas
Two new calcium tantalate polytypes have been prepared in the system Ca2Ta2O7-Ca2Nb2O7. Their structures have been determined and refined using single crystal X-ray diffraction data and powder neutron diffraction data, and their dielectric properties have

Chemical Analysis of HfO 2 / Si (100) Film Systems Exposed to NH 3 Thermal Processing

October 12, 2021
Author(s)
Patrick S. Lysaght, Joseph Woicik, Daniel A. Fischer, Gennadi Bersuker, Joel Barnett, Brendan Foran, Hsing-Huang Tseng, Raj Jammy
Nitrogen incorporation in HfO2/SiO2 films utilized as high-k gate dielectric layers in advanced metal-oxide field-effect transistors (MOSFETs) has been investigated. Thin HfO2 blanket films deposited by atomic layer deposition on either SiO2 or NH3 treated

Displacive Phase Transition in SrTiO 3 Thin Films Grown on Si(001)

October 12, 2021
Author(s)
F S. Aguirre-Tostado, A Herrera-Gomez, Joseph Woicik, R Droopad, Z Yu, D G. Schlom, E Karapetrova, P Zschack
Polarization dependent x-ray absorption fine structure measurements performed at the Ti K edge together with x-ray diffraction have been used to study the local structure in SrTiO3 thin films grown epitaxially on Si(001). SrTiO3 layers on Si(001) are found

Dopant Location Identification in Nd 3+ -Doped TiO 2 Nanoparticles

October 12, 2021
Author(s)
W Li, A I. Frenkel, Joseph Woicik, C Ni, S I. Shah
Doping large bandgap semiconductors is typically done in order to enhance photocatalytic, photovoltaic and other chemical and optoelectronic properties. The identification of dopant position and its local environment is essential to exploring the doping

Effects of Bond Coat Surface-Roughness on Residual Stresses of Thermal Barrier Coating Systems

October 12, 2021
Author(s)
C H. Hsueh, J Haynes, M Lance, P Becher, M Ferber, Stephen A. Langer, W Carter, W R. Cannon, Lin-Sien H. Lum
The adherence of plasma-sprayed thermal barrier coatings (TBCs) is dependent on mechanical interlocking at the interface between the ceramic top coat and the underlying metallic bond coat. A rough bond coat surface is required in order to establish

Effects of Solution pH and Surface Chemistry on the Post-Deposition Growth of Chemical Bath Deposited PbSe Nanocrystalline Films

October 12, 2021
Author(s)
Shaibai K. Sarkar, Shifi Kababya, Shimon Vega, Hagal Cohen, Joseph Woicik, A I. Frenkel, Gary Hodes
Chemical bath deposited PbSe films were subjected to post-deposition treatment with aqueous (typically 0.25 - 0.5 M) KOH. For films deposited using a citrate complex, this treatment resulted in dissolution of surface lead oxides (seen from XPS and EXAFS

Elastic Modulus Measurements in Plasma Sprayed Deposits

October 12, 2021
Author(s)
Jay S. Wallace, J Ilavsky
A technique has been developed to characterize the elastic modulus of zirconium oxide-8% yttrium oxide plasma sprayed deposits. A commercial hardness indenter has been modified to record load-displacement as a spherical ball is elastically loaded onto the

Electron Backscatter Diffraction Investigation of a Nano-Crystalline Pt Thin Film

October 12, 2021
Author(s)
T Maitland, X Han, Mark D. Vaudin, G R. Fox, M Coy
A polycrystalline Pt thin film deposited on a cut Si single crystal wafer coated with SiO2 and a TiO2 adhesion layer was studied using automated electron backscatter diffraction (EBSD). Integration of the EBSD detector and a scanning electron microscope

Environmentally Enhanced Crack Growth in AlN

October 12, 2021
Author(s)
Roy W. Rice, C C. Wu, K R. McKinney, Stephen W. Freiman, L E. Dolhert, J H. Enloe
Three tests: (1) dynamic fatigue; (2) flexure strength, and (3) direct, double-cantilever beam stress intensity-crack velocity measurements carried out in air (22 C) and liquid nitrogen (-196 C) all showed that dense sintered AlN undergoes slow crack
Displaying 1 - 25 of 1310