A phenomenological model of fluctuation electron microscopy for a nanocrystal/amorphous composite

Stratton, William G.; Voyles, Paul M.

doi:10.1016/j.ultramic.2007.11.004

Cited by 53 publications

(51 citation statements)

References 39 publications

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“…Another study employed a model with ordered regions in a CRN matrix to provide an expression of V(k,Q), as a function of the size and volume fraction of ordered regions and the sample thickness. [23] This model shows that variance is maximum at an intermediate volume fraction of ordered regions of a fixed size. Note that variance diminishes to zero for a uniform sample-either a perfectly disordered structure or a perfectly ordered structure.…”

Section: Data Interpretation By Using Structural Modelsmentioning

confidence: 89%

“…[22,23] In Equation (2), the variance V is expressed as a function of a correlation length L, where Q is the resolution and P(k) is a resolution-independent term; this mathematical form assumes that the 4-body correlation function decays with pairpair distance L:…”

Section: Data Interpretation By Using Structural Modelsmentioning

confidence: 99%

“…Figure 3 shows the À1 ; the absolute magnitude of variance depends on the size and number of ordered regions, the sample thickness, the beam coherence, etc. [17,23] ) Figure 5. Different amorphous silicon models with 1000 atoms in each.…”

Section: Chalcogenide Glasses: Evolution Of Nuclei In Phase-change Mamentioning

confidence: 99%

“…Aluminum-like MRO was detected from a melt-spun Al 92 Sm 8 sample, whereas no Al-like order was detected from a sample amorphized by plastic deformation. [31] A small change in composition, such as adding a few percent of Ta into a Zr-Cu-Ni-Al alloy [32] [23] may change the MRO. It has also been found that the thinning method used to prepare the TEM sample may affect the MRO-ion thinning induces more structural order than electropolishing.…”

Section: Chalcogenide Glasses: Evolution Of Nuclei In Phase-change Mamentioning

confidence: 99%

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Fluctuation Transmission Electron Microscopy: Detecting Nanoscale Order in Disordered Structures

2010

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The structures of many disordered materials are not ideally random, but contain structural order on the scale of 1-3 nm. However, such nanoscale order, called medium-range order, cannot be detected by conventional diffraction methods in most cases. Fluctuation transmission electron microscopy (FTEM) has the capability to detect medium-range order in disordered materials based on statistical analysis of nanodiffraction patterns or dark-field images from TEM. FTEM has been successful in demonstrating the theoretically predicted development of nanoscale nuclei in amorphous chalcogenides, as well as in revealing the subtle effect of different preparation routes on the medium-range order in amorphous semiconductors and metals. The fluctuation principle can also be applied to study structural order on longer length scales in polymers and other disordered materials using X-rays or visible light. Further advances in theory and practice of FTEM will greatly increase our understanding of amorphous structures and nucleation phenomena.

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Section: Data Interpretation By Using Structural Modelsmentioning

confidence: 89%

Section: Data Interpretation By Using Structural Modelsmentioning

confidence: 99%

Section: Chalcogenide Glasses: Evolution Of Nuclei In Phase-change Mamentioning

confidence: 99%

Section: Chalcogenide Glasses: Evolution Of Nuclei In Phase-change Mamentioning

confidence: 99%

See 2 more Smart Citations

Fluctuation Transmission Electron Microscopy: Detecting Nanoscale Order in Disordered Structures

2010

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“…Although Cu substitutions in amorphous Fe alloys can refine the nanocrystal size, the Cu clustering behavior exhibited in Fe-based amorphous alloys [23][24][25][26] is not reproduced in Al glasses [27]. Thus, the Cu solute substitution affects nucleation in a different precursor mode that is observed, as a increase in volume fraction of the MRO within the amorphous matrix with substitution of Cu for Fe [28].…”

Section: Crystallization Control Through Solute Substitutionmentioning

confidence: 99%

Primary crystallization reactions in Al-based metallic glass alloys

Perepezko

Imhoff

2010

Journal of Alloys and Compounds

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Fluctuation Electron Microscopy

Voyles

Hwang

2012

Characterization of Materials

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Fluctuation electron microscopy (FEM) is a nanodiffraction technique for measuring nanometer scale order in amorphous materials. Either dark‐field transmission electron microscope imaging or coherent electron nanodiffraction in a scanning transmission electron microscope is used to measure the diffracted intensity from the sample with nanometer spatial resolution. Fluctuations in that intensity from place to place on the sample reveal the size, density, and internal atomic arrangements of nanometer‐scale order. Nanometer scale order in glasses is also called medium‐range order (MRO). Fluctuation microscopy is one of the few experimental techniques sensitive to this type of structure in amorphous materials.

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A phenomenological model of fluctuation electron microscopy for a nanocrystal/amorphous composite

Cited by 53 publications

References 39 publications

Fluctuation Transmission Electron Microscopy: Detecting Nanoscale Order in Disordered Structures

Fluctuation Transmission Electron Microscopy: Detecting Nanoscale Order in Disordered Structures

Primary crystallization reactions in Al-based metallic glass alloys

Fluctuation Electron Microscopy

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