Characterization of microstructural defects in BF+2‐implanted silicon

1985 ◽  
Vol 58 (8) ◽  
pp. 3032-3038 ◽  
Author(s):  
I. W. Wu ◽  
L. J. Chen
Keyword(s):  
Microstructural Defects

scholarly journals Processing and Characterization of Yttria-Stabilized Zirconia Foams for High-Temperature Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Ana María Herrera ◽  
Amir Antônio Martins de Oliveira ◽  
Antonio Pedro Novaes de Oliveira ◽  
Dachamir Hotza
Keyword(s):  
High Temperature ◽  
Thermal Behavior ◽  
Polyurethane Foams ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Ceramic Foams ◽  
Pore Sizes ◽  
Replication Method ◽  
Microstructural Defects

In this work ceramic foams of 3 and 8 mol% yttria-stabilized zirconia (3YSZ and 8YSZ) were manufactured by the replication method using polystyrene-polyurethane foams with pore sizes in the 7–10 ppi range. A second coating was carried out on presintered foams in order to thicken struts and hinder microstructural defects. The produced ceramic foams were structurally and thermomechanically characterized. Samples recoated with 3YSZ presented the highest relative densities (0.2±0.1) which contributed to a better mechanical and thermal behavior.

Characterization of microstructural defects from temperature dependence of domain wall coercive field

1998 ◽  
Vol 08 (PR2) ◽  
pp. Pr2-307-Pr2-310 ◽  
Author(s):  
J. Kadlecová ◽  
K. Metlov ◽  
Tomás ◽  
G. Vértesy
Keyword(s):  
Domain Wall ◽  
Temperature Dependence ◽  
Coercive Field ◽  
Microstructural Defects

Methodology for 3D characterization of microstructural defects in filled polymer using X-ray Tomography

2019 ◽  
pp. 77-81
Author(s):  
J. Kallungal ◽  
L. Chazeau ◽  
J-M. Chenal ◽  
J. Adrien ◽  
E. Maire ◽  
...  
Keyword(s):  
Filled Polymer ◽  
X Ray ◽  
Microstructural Defects

Defects in High Tc Cuprate Superconductors

MRS Bulletin ◽  
1991 ◽  
Vol 16 (11) ◽  
pp. 54-59 ◽  
Author(s):  
Yimei Zhu ◽  
J. Tafto ◽  
M. Suenaga
Keyword(s):  
Cuprate Superconductors ◽  
Oxide Superconductors ◽  
Layered Oxides ◽  
High Tc ◽  
Transmission Electron ◽  
Microstructural Defects ◽  
Current Densities ◽  
The Many ◽  
The Relationship

Characterization of microstructural defects in high critical temperature oxide superconductors has been very valuable in gaining an understanding of their phase transformations and insight into the relationship between defects and some superconducting properties such as critical current densities Jc. For this purpose, transmission electron microscopy (TEM) techniques have been proved powerful. In this article we will briefly summarize typical defects in the perovskite-based layered oxides, i.e., [La(1−x)(Ba,Sr)x]2CuO4, YBa2Cu3O7−δ, and (Bi,Pb)2Sr2Can−1Cun−O4+2n+δ. Then we will discuss the nature of defects in YBa2Cu3O7−δ in detail since this oxide has been most extensively studied. Among the many varieties of microstructural defects in YBa2Cu3O7−δ, we will emphasize only those we consider most important. An account of the field before 1990 is given in an excellent review by Beyers and Shaw and a more recent review of the structure of the grain boundaries in YBa2Cu3O7−δ by Babcock.Since the types and the nature of the defects depend greatly on the crystal structure of the materials, the basic structures of the three oxides are shown in Figures la to 1c: (a) [La1−x(Sr,Ba)x]2CuO4, (2:1:4), (b) YBa2Cu3O7 (1:2:3:), and (c) Bi2Sr2CaCu2O8 (2:2:1:2). (The structure of Tl cuprates are very similar to the Bicuprate and will not be discussed here.)

scholarly journals Characterization of microstructural defects in melt grown ZnO single crystals

2011 ◽  
Vol 109 (6) ◽  
pp. 063516 ◽  
Author(s):  
W. Anwand ◽  
G. Brauer ◽  
R. I. Grynszpan ◽  
T. E. Cowan ◽  
D. Schulz ◽  
...  
Keyword(s):  
Single Crystals ◽  
Microstructural Defects

Polarization Light Optical Texture Analysis for the Structural Characterization of CIM Components

2006 ◽  
Vol 45 ◽  
pp. 1690-1695
Author(s):  
Johannes Rauch ◽  
Frank Kern ◽  
Rainer Gadow
Keyword(s):  
Crystal Orientation ◽  
Quantitative Description ◽  
Polarization Microscopy ◽  
Thin Sections ◽  
Color System ◽  
Microstructural Defects ◽  
Optical Axes ◽  
Injection Molded ◽  
Shrinkage Behavior

The mechanical properties of ceramic injection molded (CIM) components are largely influenced by microstructural inhomogeneities that result from the interaction of rheological properties of the thermoplastic feedstock with machine parameters and the design of mold and injection gate. These inhomogeneities (e. g. texture, turbulences, joints, and density gradients) can form weak spots in the material or lead to anisotropy of the material properties. Additionally, they can influence the local sinter shrinkage behavior and thereby lead to the formation of residual stresses in the component. For this reason, it is of great importance to analyze these inhomogeneities in order to improve CIM processes and CIM components. A method has been developed for the investigation of preferred crystal orientation and microstructural defects, applying polarization microscopy of ceramic thin sections and colorimetry. Polarization microscopy is used in order to visualize the crystal orientation of the single grains. Different orientations of the optical axes will result in different colors of interference for optically uniaxial materials. The polarization micrographs themselves are already suitable for the analysis of the microstructure of CIM components regarding texture, separation planes, etc. Colorimetry is used in order to measure and describe the colors in a standardized color system. By means of color/orientation calibration curves that are measured with single crystal references, a quantitative description of the orientation of single grains as well as texturized areas can be obtained.

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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