The Transmission Electron Microscope

Williams, David B.; Carter, C. Barry

doi:10.1007/978-0-387-76501-3_1

Cited by 276 publications

(244 citation statements)

References 11 publications

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“…In [6,16] , it is illustrated we can assume that the HAADF detector collects electrons complementary to the electrons scattered to angles smaller than its inner detector angle. The electrons can also be scattered to angles beyond the outer detector angle, but the proportion is negligibly small.…”

Section: The Nonlinear Modelmentioning

confidence: 99%

Automatic correction of nonlinear damping effects in HAADF–STEM tomography for nanomaterials of discrete compositions

et al. 2018

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a b s t r a c t HAADF-STEM tomography is a common technique for characterizing the three-dimensional morphology of nanomaterials. In conventional tomographic reconstruction algorithms, the image intensity is assumed to be a linear projection of a physical property of the specimen. However, this assumption of linearity is not completely valid due to the nonlinear damping of signal intensities. The nonlinear damping effects increase w.r.t the specimen thickness and lead to so-called "cupping artifacts", due to a mismatch with the linear model used in the reconstruction algorithm. Moreover, nonlinear damping effects can strongly limit the applicability of advanced reconstruction approaches such as Total Variation Minimization and discrete tomography.In this paper, we propose an algorithm for automatically correcting the nonlinear effects and the subsequent cupping artifacts. It is applicable to samples in which chemical compositions can be segmented based on image gray levels. The correction is realized by iteratively estimating the nonlinear relationship between projection intensity and sample thickness, based on which the projections are linearized. The correction and reconstruction algorithms are tested on simulated and experimental data.

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Section: The Nonlinear Modelmentioning

confidence: 99%

Automatic correction of nonlinear damping effects in HAADF–STEM tomography for nanomaterials of discrete compositions

et al. 2018

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“…New classes of oxide magnets with interesting properties, for example, colossal magnetoresistance, appeared at that time [1]. Novel methods of synthesis of epitaxial films (pulsed laser deposition (PLD) method) and nanostructure investigation (transmission electron microscope (TEM), force microscopes) were being implemented [2,3]. It became apparent that nanoparticles of some magnetic oxides might find practical application in medicine, particularly, for enhancing the sensitivity of diagnostics methods (MRI) [4], and in therapy (hyperthermia treatment, targeted drug delivery etc.)…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Properties and Applications of some Magnetic Oxide Based Nanoparticles and Films

Белоус¹,

Tovstolytkin

Solopan³

et al. 2018

Acta Phys. Pol. A

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The work highlights peculiar features of synthesis and summarizes important properties of nanoparticles and films based on two types of oxide magnets: with spinel and perovskite-type structures. The attention is drawn to the differences in the processes underlying the formation of crystalline phase in the materials of each group. It is shown that for the spinels, the formation of weakly agglomerated crystalline nanoparticles can occur in the process of synthesis, but for the perovskite-like magnets, the formation of crystalline nanoparticles requires additional high-temperature treatment. It is demonstrated that synthesized nanoparticles and films may find wide practical applications, particularly as the heat mediators in hyperthermia treatment therapy, as components of left-handed media, ferroelectric-ferromagnetic layered structures and composite microwave resonators. They also may be used as integral parts of composite structures, which possess magnetic-field-controlled properties and display giant magnetocaloric effect.

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“…Experimental analyses are often based on diffraction patterns, e.g. from X-rays [15] or electrons [21]. The most common technique for symmetry extraction from crystalline images is the classification of the Bragg reflections [3], i.e.…”

Section: Introductionmentioning

confidence: 99%

Unsupervised and Accurate Extraction of Primitive Unit Cells from Crystal Images

Mevenkamp

Berkels

2015

Lecture Notes in Computer Science

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Abstract. We present a novel method for the unsupervised estimation of a primitive unit cell, i.e. a unit cell that can't be further simplified, from a crystal image. Significant peaks of the projective standard deviations of the image serve as candidate lattice vector angles. Corresponding fundamental periods are determined by clustering local minima of a periodicity energy. Robust unsupervised selection of the number of clusters is obtained from the likelihoods of multi-variance cluster models induced by the Akaike information criterion. Initial estimates for lattice angles and periods obtained in this manner are refined jointly using non-linear optimization. Results on both synthetic and experimental images show that the method is able to estimate complex primitive unit cells with sub-pixel accuracy, despite high levels of noise.

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The Transmission Electron Microscope

Cited by 276 publications

References 11 publications

Automatic correction of nonlinear damping effects in HAADF–STEM tomography for nanomaterials of discrete compositions

Automatic correction of nonlinear damping effects in HAADF–STEM tomography for nanomaterials of discrete compositions

Synthesis, Properties and Applications of some Magnetic Oxide Based Nanoparticles and Films

Unsupervised and Accurate Extraction of Primitive Unit Cells from Crystal Images

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