The use of Electron Microscopy and Electron Diffraction in the Study of Phase Transformations

1982 ◽  
Vol 21 ◽  
Author(s):  
S. Amelinckx ◽  
G. Van Tendeloo ◽  
J. Van Landuyt
Keyword(s):  
Electron Microscopy ◽  
Solid State ◽  
High Resolution ◽  
Electron Diffraction ◽  
Optical Diffraction ◽  
Solid State Electron ◽  
Selected Area Electron Diffraction ◽  
Separate Branch ◽  
Resolution Electron ◽  
Convergent Beam

In recent years a separate branch of electron microscopy, which can conveniently be termed “Solid State Electron Microscopy” has evolved into a discipline of its own, which makes use of a set of techniques such as- diffraction contrast electron microscopy- high resolution transmission electron microscopy- selected area electron diffraction- convergent beam electron diffraction- optical diffraction of high resolution electron micrographsand which allows to provide information on a wide variety of solid state phenomena. With the availability of microscopes with a resolution equal to interatomic distances its field of application has recently been extended greatly.

Orientation Relationship between Fe2M and Martensite in M50NiL Steel

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 .

On the interpretation of electron diffraction patterns from materials containing planar boundaries: the intergrowth tungsten bronzes

1990 ◽  
Vol 429 (1876) ◽  
pp. 91-117 ◽  
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Electron Diffraction ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
General Interest ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Resolution Imaging ◽  
Diffraction Patterns

Materials containing planar boundaries are of general interest and complete understanding of their structures is important. When direct imaging of the boundaries by, for instance, high-resolution electron microscopy, is impracticable, details of their structure and arrangement may be obtained from electron diffraction patterns. Such patterns are discussed in terms of those from intergrowth tungsten bronzes as specific examples. Fourier-transform calculations for proposed structures have been made to establish, in conjunction with optical-diffraction analogues, the features of the far-field diffraction patterns. These results have been compared with diffraction patterns obtained experimentally by transmission electron microscopy. The aim of the study, to show that the arrangement of the boundaries in these complicated phases can be deduced from their diffraction patterns without the need for high-resolution imaging, has been achieved. The steps to be taken to make these deductions are set out.

High-resolution electron microscopy of disordered LiFeO2

1984 ◽  
Vol 42 ◽  
pp. 430-431
Author(s):  
Nobuo Tanaka ◽  
J.M. Cowley
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Electron Diffraction ◽  
Diffuse Scattering ◽  
Fine Powder ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Lithium Ferrite ◽  
Clustering Model ◽  
Resolution Electron

The disordered structure of lithium ferrite (α-LiFeO2) has been investigated in X-ray and electron diffraction techniques. The characteristic short range order (SRO) diffuse scattering was commonly interpreted by the clustering model. The SRO state can be described by interconnecting two kinds of clusters (Fig. 1). Alternatively, it may be interpreted in terms of microdomains of some ordered structures.In the present study, the specimen was investigated with high resolution electron microscopy and optical diffraction technique. The techniquescould give the information about the SRO state in a direct way. The material investigated was α-LiFeO2 in the form of a fine powder dispersed on a holey carbon grid.Fig. 2 shows electron diffraction patterns of the specimen in the <001> and <110> observing directions. The locus of the diffuse scattering does not exactly fit with the formula, cosπh + cosπk + cosπℓ = 0, which was derived from SRO arrangement of Li and Fe ions inside the clusters. This fact suggests the existance of “inter-cluster” ordering.

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