scholarly journals On the relationship of magnetocrystalline anisotropy and stoichiometry in epitaxial L10 CoPt (001) and FePt (001) thin films

2005 ◽  
Vol 98 (3) ◽  
pp. 033904 ◽  
Author(s):  
K. Barmak ◽  
J. Kim ◽  
L. H. Lewis ◽  
K. R. Coffey ◽  
M. F. Toney ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetocrystalline Anisotropy ◽  
Relationship Of ◽  
The Relationship

On the relationship of high coercivity and L10 ordered phase in CoPt and FePt thin films

1999 ◽  
Vol 86 (8) ◽  
pp. 4527-4533 ◽  
Author(s):  
R. A. Ristau ◽  
K. Barmak ◽  
L. H. Lewis ◽  
K. R. Coffey ◽  
J. K. Howard
Keyword(s):  
Thin Films ◽  
High Coercivity ◽  
Relationship Of ◽  
The Relationship ◽  
Fept Thin Films

Tensile testing low density multilayers: Aluminum/titanium

1998 ◽  
Vol 13 (10) ◽  
pp. 2902-2909 ◽  
Author(s):  
D. Josell ◽  
D. van Heerden ◽  
D. Read ◽  
J. Bonevich ◽  
D. Shechtman
Keyword(s):  
Thin Films ◽  
Yield Stress ◽  
Tensile Testing ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Low Density ◽  
Multilayer Thin Films ◽  
Bilayer Thickness ◽  
Relationship Of ◽  
The Relationship

Yield stresses, ultimate tensile strengths, and specific strengths of aluminum/titanium multilayer thin films are determined from the results of uniaxial tensile tests. The plasticity in the stress-strain curves, the nature of the fracture surfaces, and the relationship of the yield stress and the bilayer thickness are discussed. Properties are compared with those of other multilayer materials published in the literature.

Structural Transformation Relationship for Hafnia Ferroelectric Phase

2013 ◽  
Vol 873 ◽  
pp. 865-870
Author(s):  
Hai Zhu Xiao ◽  
Fei Ye ◽  
Da Yu Zhou ◽  
Fei Ming Bai
Keyword(s):  
Thin Films ◽  
Structural Transformation ◽  
Ferroelectric Phase ◽  
Structural Transformations ◽  
Structural Relationship ◽  
Atomic Displacements ◽  
Lattice Energies ◽  
Relationship Of ◽  
The Relationship ◽  
Dominant Phase

The ferroelectricity of hafnia-based thin films with a dominant phase of orthorhombic Pca21has been reported. However, the relationship of structural transformations between the orthorhombic Pca21and other hafnia structures remains unclear. In this work, all the structures have been optimized. Then, the fluorite-related structures have been used to analyze the structural relationship. Calculations of the lattice energies and the relative atomic displacements between the structures suggest that the Pca21phase may originate from the P42/nmc or Pbca phases.

The Relationship of Electrical and Structural Properties of Synthetic Melanin Embedded in Matrix of Thin Films Zinc Oxide, for their Use as Electrodes in Bio-Generators

2010 ◽  
Vol 75 ◽  
pp. 31-35
Author(s):  
Delia Cristina Altamirano-Juárez ◽  
José Javier Hernández-Barriga ◽  
Carlos García-Pacheco
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Structural Properties ◽  
Structural Changes ◽  
Amorphous Material ◽  
Soft Chemistry ◽  
Doped Zno ◽  
Relationship Of ◽  
The Relationship ◽  
Basic Region

Melanin doped zinc oxide thin films were obtained using a process of soft chemistry with pH in the basic region. The electric and structural properties of these films were compared with films of un-doped ZnO obtained using the same process. Undoped films show the characteristic diffraction pattern of polycrystalline ZnO wurtzite type, while the doped films also present other signals associated to the melanin or some derived present phase of this. It is relevant because melanin is reported as amorphous material. Differences of grain size were detected and attributed to the presence of at least two existent phases in the films. Resistivity data were analyzed from the obtained values of films of un-doped ZnO and associated to the structural changes. The films have turned out to be stable in bio-generating systems of useful energy.

HREM of Epitaxial YBa2Cu3O7 Thin Films

1990 ◽  
Vol 183 ◽  
Author(s):  
T. E. Mitchell ◽  
S. N. Basu ◽  
M. Nastasi ◽  
T. Roy
Keyword(s):  
Thin Films ◽  
Critical Current Density ◽  
Grain Boundaries ◽  
Critical Current ◽  
Current Density ◽  
Small Angle ◽  
Stacking Faults ◽  
Cross Sectional ◽  
Relationship Of ◽  
The Relationship

AbstractThin films of YBa2Cu3O7 have been prepared by evaporation of Cu, Y and BaF2 onto (001) SrTiO3, LaGaO3. and LaAlO3 and subsequent annealing. Their microstructures have been examined by HREM of cross-sectional specimens. Epitaxial (001) grains of YBa2Cu3O7 form near the substrate interface in thin films but (001) and (010) grains tend to nucleate as the film thickens. 90° grain boundaries are therefore common, as well as other defects such as small-angle boundaries, dislocations and stacking faults. HREM of the substrate/superconductor interface indicates regions of perfect epitaxy, highly distorted areas, amorphous regions and areas showing evidence of interdiffusion. The relationship of these microstructural features to critical current density is discussed.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

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