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Materials

Ceramics

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Displaying 176 - 200 of 1322

Crystallographic Data Sources

February 19, 2017
Author(s)
Vicky L. Karen
Crystallography has a long and successful history of self-organization and was one of the first areas to create numerical scientific databases. Virtually all structure determinations have been archived in databases that allow ready access and complete

Crystallography and Crystal Chemistry of (Ba 1-x Sr x )2TiO 4

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 series. Since the end members of the series - Ba2TiO4 (Pnma (No.62)) and Sr2TiO4 (I4/mmm (No

Data and Informatics Needs in Biomaterials

February 19, 2017
Author(s)
C P. Sturrock
Biomaterials are nonviable materials used in medical devices, that are intended to interact with biological systems. In 2002 the total U.S. Medical device market stood at $77 billion, with global sales estimated at 2-3 times this figure. Approximately 40

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. The plane-section observations provide a description of the primary defects, found to be

Determining Crystal Habits From Oberservations of Planar Sections

February 19, 2017
Author(s)
D M. Saylor, G S. Rohrer
A Method is described for reconstructing the crystal habit from the observations of many random planar sections of known orientation. We have generated simulated observations based on five different assumed crystal habits and found that it is possible to

Dielectric and Structural Studies of Ba 2 ReNb 3 Ti 2 O 15 (BReNTO 15 ,Re=Bi 3+ ,La 3+ ,Nd 3+ ,Sm 3+ ,Gd 3+ ) Tetragonal Tungsten Bronze Structured Ceramics

February 19, 2017
Author(s)
Igor Levin, M Stennett, I Reaney, G Miles, D I. Woodward, C Kirk, A R. West
The structure and dielectric properties of a new family of tetragonal tungsten bronze structured ceramics with the general formula, Ba 2ReNb 3Ti 2O 15 (BReNTO 15,Re=Bi 3+,La 3+,Nd 3+,Sm 3+,Gd 3+) have been investigated. BLNTO15 Tmax -100 C) and BBNTO15

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 boundaries. The locations of these sites are reproducible and 180 degrees domains appear to extend from

Duality of Dislocation Content of Grain Boundaries

February 19, 2017
Author(s)
John W. Cahn, Yuri Mishin, A Suzuki
The Frank-Bilby equation (FBE) can give many solutions for the dislocation content of a grain boundary (GB); most of them are considered to have little physical reality except in limited ranges of the angles which characterize low-angle GBs. We explore two

Effect of Colloidal Probe Random Surface Features on Adhesion

February 19, 2017
Author(s)
Seung H. Yang, Stephen M. Hsu
We have uncovered the fact that colloidal probes often have random surface features which when not properly accounted for, can significantly affect the magnitudes of the measured adhesive forces using atomic force microscopes (AFM). Colloidal probes have

Effect of Wear Track Diameter on Tribological Behavior

February 19, 2017
Author(s)
S Jahanmir
Wear tests were conducted using a pin-on-disk tribometer to evaluate the effect of disk track diameter on the tribological behavior. High purity alumina balls were used as pins sliding against glass-ceramic (IPS empress 2) disks under distilled water

Effects of Large Grains on Transgranular Fracture Toughness

February 19, 2017
Author(s)
Stephen W. Freiman
This paper addresses issues of fracture for materials in which large grains, exist in a matrix of much smaller grains. Materials used for optical components, such as ZnS and ZnSe frequently fall into this category. For materials of this sort failure can

Effects of Polarity on Grain Boundary Migration in ZnO

February 19, 2017
Author(s)
Jong S. Lee, Sheldon M. Wiederhorn
Boundary migration of ZnO has been investigated using single crystals with defined crystallographic orientations. The migration rate of the basal C planes depended on the crystallographic polarity: Zn-terminated positive (0001)-planes. The migration in the

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. In a recent survey of its members, the environment was identified as the primary issue facing
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