TEM STUDY OF NEW HIGH-Tc SUPERCONDUCTORS IN THE Bi-Sr-Ca-Cu-O SYSTEM

Electron diffraction and high resolution electron microscopy have been used to study the structure of superconducting phases in Bi-Sr-Ca-Cu-O system. The average structures of two main superconducting phases Bi 2 Sr 2 CaCu 2 O y and Bi 2 Sr 2 Ca 2 Cu 3 O y have orthorhombic cells with lattice parameters a=5.41Å, b=5.43Å, c=30.7Å and a=5.41Å, b=5.43Å, c=36.8Å respectively. Incommensurate modulations with wave vector nearly along the b* axis appear in both phases. A minor phase in this system with the same lattice parameters a and b but a smaller c(=24.6Å) has also been observed. Intergrowth of lamellae of different phases does occur in Bi-Sr-Ca-Cu-O system.

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Visualization of Oxygen Atoms in YBa2Cu3O6+x High-Tc Superconductors by Ultra-High-Resolution Electron Microscopy

Journal of Electron Microscopy ◽

10.1093/oxfordjournals.jmicro.a051026 ◽

1993 ◽

Keyword(s):

Electron Microscopy ◽

High Resolution ◽

High Resolution Electron Microscopy ◽

High Tc Superconductors ◽

High Tc ◽

Resolution Electron ◽

Oxygen Atoms

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High-resolution electron microscopy study on crystal structures of high-Tc superconductors

Journal of Electron Microscopy Technique ◽

10.1002/jemt.1060120306 ◽

1989 ◽

Vol 12 (3) ◽

pp. 228-243 ◽

Cited By ~ 14

Author(s):

Kenji Hiraga ◽

Takeo Oku ◽

Daisuke Shindo ◽

Makoto Hirabayashi

Keyword(s):

Electron Microscopy ◽

High Resolution ◽

Crystal Structures ◽

High Resolution Electron Microscopy ◽

Microscopy Study ◽

Electron Microscopy Study ◽

High Tc Superconductors ◽

High Tc ◽

Resolution Electron

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HIGH RESOLUTION ELECTRON MICROSCOPY OF THE HIGH Tc SUPERCONDUCTOR Bi2Sr2CaCu2O8+δ

Modern Physics Letters B ◽

10.1142/s0217984988000552 ◽

1988 ◽

Vol 02 (06) ◽

pp. 835-839 ◽

Cited By ~ 19

Author(s):

M. HERVIEU ◽

B. DOMENGES ◽

C. MICHEL ◽

B. RAVEAU

Keyword(s):

Electron Microscopy ◽

High Resolution ◽

Electron Diffraction Study ◽

High Resolution Electron Microscopy ◽

Basic Structure ◽

Tetragonal Symmetry ◽

High Tc ◽

Resolution Electron ◽

High Resolution Images ◽

New Superconductor

The new superconductor Bi 2 Sr 2 CaCu 2 O 8+δ with T c ranging from 80 to 105K, was studied by electron microscopy. The electron diffraction study shows a pseudo-tetragonal symmetry with a≈b≈5.4 Å and c≈30.7 Å and satellites along a, which settle in an incommensurate way. The high resolution images agree with the proposed basic structure. The stacking of the ( BiO y)2 and [ Sr 2 CaCu 2 O 6] layers is quite regular, with only some defects corresponding to c≈24 Å. The lamellar character of the oxide results in splitting and bending of the crystals.

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Orientation Relationship between Fe2M and Martensite in M50NiL Steel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.456.533 ◽

2013 ◽

Vol 456 ◽

pp. 533-536

Author(s):

Yan Zhi Lou

Keyword(s):

Crystal Structure ◽

Electron Microscopy ◽

High Resolution ◽

Electron Diffraction ◽

Orientation Relationship ◽

High Resolution Electron Microscopy ◽

Lattice Parameters ◽

Selected Area Electron Diffraction ◽

Resolution Electron ◽

Martensite Matrix

In this paper, high resolution electron microscopy (HREM) was used to observe nanosized Fe2M precipitates in M50NiL steel, and crystal structure of which was also investigated by selected area electron diffraction (SAED). At the same time, the orientation relationship between the Fe2M and the martensite matrix was also studied. The results suggested that crystal structure of Fe2M is close-packed hexagonal, and lattice parameters about a=b=0.473nm, c=0.772nm, α=β=90°, γ=120°. The orientation relationship between the nanoprecipitates Fe2M and martensite is and .

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