Relaxation-Induced Gettering of Metal Impurities in Silicon: Microscopic Properties of Effective Gettering Sites

1992 ◽  
Vol 262 ◽  
Author(s):  
M. Seibt

ABSTRACTSome gettering processes like internal gettering or backside damage gettering base on heterogeneous precipitation of metal impurities at defects in pre-de ter mined parts of silicon wafers during cooling from high temperatures. We consider microscopic properties of effective heterogeneous nucleation sites for cobalt, nickel and copper impurities from the fundamental point of view of suicide precipitate formation. We follow the basic concept that such gettering sites are defects which allow fast precipitation, i.e. which remove kinetic limitations known from homogeneous precipitation of these impurities at small supersaturation. For Co and Ni it follows that distorted lattice sites in the core of dislocations may establish high incorporation rates of interstitial atoms into suicide particles, whereas for Cu sinks for silicon self-interstitials are suitable gettering sites.

NANO ◽  
2017 ◽  
Vol 12 (07) ◽  
pp. 1750080 ◽  
Author(s):  
Hu Jin ◽  
Dehua Xu ◽  
Jingling Li ◽  
Kelai Wang ◽  
Zhuoneng Bi ◽  
...  

Hollow glass microsphere (HGM)/TiO2 core-shell structural composites have promising applications in the field of energy efficient solar-reflective paints. In this work, after pretreated with saturated Ca(OH)2 solutions, litchis-like TiO2 shells have been successfully synthesized on HGMs via a controllably heterogeneous precipitation method with Titanium (IV) sulfate (Ti(SO[Formula: see text] and urea as reaction precursors. It is emphasized that the use of urea as the precipitating agent is essential for the heterogeneous nucleation and growth of Ti(OH)4 on HGMs, while the Ca(OH)2 pretreatment provides the heterogeneous nucleation sites on HGMs which promotes the nucleation and growth of Ti(OH)4, and gives rise to large secondary Ti(OH)4 particles, leading to the formation of litchis-like TiO2 shells. The resulted core-shell structural HGM/TiO2 microspheres exhibited highest solar reflectance of [Formula: see text]83%.


Author(s):  
T. E. Mitchell ◽  
M. R. Pascucci ◽  
R. A. Youngman

1. Introduction. Studies of radiation damage in ceramics are of interest not only from a fundamental point of view but also because it is important to understand the behavior of ceramics in various practical radiation enyironments- fission and fusion reactors, nuclear waste storage media, ion-implantation devices, outer space, etc. A great deal of work has been done on the spectroscopy of point defects and small defect clusters in ceramics, but relatively little has been performed on defect agglomeration using transmission electron microscopy (TEM) in the same kind of detail that has been so successful in metals. This article will assess our present understanding of radiation damage in ceramics with illustrations using results obtained from the authors' work.


1994 ◽  
Vol 116 (4) ◽  
pp. 741-750 ◽  
Author(s):  
C. H. Venner

This paper addresses the development of efficient numerical solvers for EHL problems from a rather fundamental point of view. A work-accuracy exchange criterion is derived, that can be interpreted as setting a limit to the price paid in terms of computing time for a solution of a given accuracy. The criterion can serve as a guideline when reviewing or selecting a numerical solver and a discretization. Earlier developed multilevel solvers for the EHL line and circular contact problem are tested against this criterion. This test shows that, to satisfy the criterion a second-order accurate solver is needed for the point contact problem whereas the solver developed earlier used a first-order discretization. This situation arises more often in numerical analysis, i.e., a higher order discretization is desired when a lower order solver already exists. It is explained how in such a case the multigrid methodology provides an easy and straightforward way to obtain the desired higher order of approximation. This higher order is obtained at almost negligible extra work and without loss of stability. The approach was tested out by raising an existing first order multilevel solver for the EHL line contact problem to second order. Subsequently, it was used to obtain a second-order solver for the EHL circular contact problem. Results for both the line and circular contact problem are presented.


2002 ◽  
Vol 16 (20n22) ◽  
pp. 3258-3264 ◽  
Author(s):  
S. A. GRIGERA ◽  
A. P. MACKENZIE ◽  
A. J. SCHOFIELD ◽  
S. R. JULIAN ◽  
G. G. LONZARICH

In this paper, we discuss the concept of a metamagnetic quantum critical end-point, consequence of the depression to zero temperature of a critical end-point terminating a line of first order first transitions. This new type of quantum critical point (QCP) is interesting both from a fundamental point of view: a study of a symmetry conserving QCP, and because it opens the possibility of the use of symmetry breaking tuning parameters, notably the magnetic field. In addition, we discuss the experimental evidence for the existence of such a QCP in the bilayer ruthenate Sr3Ru2O7.


Author(s):  
Thomas Grillot

This chapter looks at these interracial interactions from the point of view of Indians in an effort at writing a historical anthropology of Indian patriotism. At the core of Indians' military participation and commemoration of the Great War, the practice of giving, to non-Indians or to Indians, to outsiders or to insiders, to family members or to complete strangers, structured the expression of patriotism in Indian communities. Examining Memorial and Armistice Days, in particular, this chapter looks at the role these holidays played in allowing Indians to maintain boundaries with their white neighbors and develop a series of adaptations of patriotic symbols and ceremonies that acclimatized patriotism for reservation life on an unprecedented scale.


2019 ◽  
Author(s):  
Frank Biedermann ◽  
Garima Ghale, Ghale ◽  
Andreas Hennig ◽  
Werner M. Nau

<p>The spatiotemporally resolved monitoring of membrane translocation, <i>e.g.,</i> of drugs or toxins, has been a long-standing goal. Herein, we introduce the fluorescent artificial receptor-based membrane assay (FARMA), a facile, label-free method. With FARMA, the permeation of more than hundred organic compounds (drugs, toxins, pesticides, neurotransmitters, peptides, etc.) through vesicular phospholipid bilayer membranes has been monitored in real time (µs-h time scale) and with high sensitivity (nM-µM concentration), affording permeability coefficients across an exceptionally large range from 10<sup>–9</sup>‑10<sup>–3</sup> cm s<sup>–1</sup>. From a fundamental point of view, FARMA constitutes a powerful tool to assess structure-permeability relationships and to test biophysical models for membrane passage. From an applied perspective, FARMA can be extended to high-throughput screening by adaption of the microplate reader format, to spatial monitoring of membrane permeation by microscopy imaging, and to the compartmentalized monitoring of enzymatic activity.<b></b></p>


2019 ◽  
Vol 17 (4) ◽  
pp. 63-77
Author(s):  
Nikita V. Golovko

The paper aims to look for an adequate ontological explanation of the «second pattern» existence within Ladyman’s ITSR, the existence of which is a necessary condition that the analyzed pattern is a real pattern indeed. From Ladyman’s point of view, the ontological truthmaker for the epistemic fact is thus that it is a real pattern. As the core interpretation of truthmaking within Ladyman’s concept, we will take the interpretation of truthmaking as essential dependence proposed by E.J. Lowe: an object is a truthmaker for the proposition when part of the essence of the proposition is that the proposition is true if the object exists. Taking into account a number of limitations of Lowe’s concept (essence precedes existence, essence is not an object, etc.), the existence of a “second pattern” within Ladyman’s conception should be understood via defining its essence, regardless of whether its very existence is ever confirmed.


2013 ◽  
Vol 13 (8) ◽  
pp. 3835-3841 ◽  
Author(s):  
Vilmalí López-Mejías ◽  
Allan S. Myerson ◽  
Bernhardt L. Trout

2019 ◽  
pp. 84-89
Author(s):  
Iryna Ivanenko

Charles Bally’s works laid the basis for the linguistic interpretation of the conceptions of association and associativity and understanding of associative mechanisms with regard to the fundamentals of psychology and systemacy of semantic links in thinking and language. The foundation of the modern theory of associativity is the classification of associations (mnemonic and necessary, close and distant, internal and external) developed by Charles Bally in his works. In linguo-stylistics the conception of association and associativity are associated with understanding of the psycholinguistic mechanisms of figurative use of language units and the realization of the aesthetic function of a literary language (S.Ya. Yermolenko, A.A. Moisiienko, L.V. Tailor, O. Malenkov, H.M. Siuta). Among the mechanisms for the formation of linguistic associations are the following factors: objective, social and intellectual experience, dependence on cultural and historical traditions, the gender identity of the speaker, etc. One of them dominates in each specific communicative situation. Currently known classifications of types of associative links take into account the basic positions of psycholinguistics, and the needs of lexicology and stylistics, etc. General differentiation is carried out: 1) for contiguity, similarity and contrast, 2) according to the scheme “word-stimulus, word-reaction”, 3) according to the type of relationship between the stimulus and the associate). Deep differentiation of associations according to the type of relationship between stimulus and associate) determines the allocation of several associative types: paradigmatic (food – bread) / syntagmatic (food – consume); thematic (friend – childhood > childhood friend); empirical (associated with the subjective experience of the speaker); social (associated with the social experience of the speaker), etc. The use of other criteria motivates the allocation of these types of associations: a) audio, visual, adorational, tangential; b) the usual and unexpected; c) direct and indirect, mediated; d) positive and negative; e) cultural, ethnic and author’’s individual. Understanding the connection between associativity and imagery is a primary issue in the modern literary language theory. Being a basis of concrete and sensual perception of the literary text, associations serve as a basis of creation of character in literature (S.Ya. Yermolenko, L.O. Pustovit, L.O. Stavitska, V.A. Chabanenko). It is necessary to consider the ideas of Franko’s treatise according to the history of the formation of the associativity theory. In particular, the proposed division of poetic associations by content (“ordinary”, that is, simple, and “linked by force”, that is, complex), remains undeniable. During the twentieth century the understanding of the mechanisms of implementation of associativity significantly deepened. One of the main subjects of intensive processing was the paradigmatic ordering of words in language and in human memory, the presence of clear mental connections between certain objects, realities on the basis of commonality or adjacency of their individual traits, features, etc. (compare.: spring – green, light, sun, warmth, flowers, feelings). This motivates the associative grouping of words into semantic fields. From linguo-stylistics point of view the associative-semantic field is a text structure, the model of the functional and stylistic implication of lexical-semantic units. The core of such a field, as a rule, are the keywords – the semantic and estimated coordinates of the entire work. Another type of lexicon combination, taking into account the associative links between the components, is an associative and imaginative field. It arises on the basis of associative and semantic or lexical and semantic association due to the identity of the denotative properties of linguistic signs, the general tradition of common language and poetic usage. Its center is the most active unit (dominant) – the core component of the series, which organizes the relationship of all other components. Associative-figurative series (lexical-thematic lines) go from this dominant, which work together semantically with the center for associative and creative field. Associativity is one of the key concepts of modern linguistic style. Terminological functionality of the conception of association and associativity is associated with the activity of cognition of the problems of “language association”, “artistic association”, “associativity and creative work”.


1999 ◽  
Vol 5 (S2) ◽  
pp. 778-779
Author(s):  
R.W Carpenter ◽  
W Braue ◽  
M.J. Kim

Lath-like silicon oxynitride crystals have often been observed in the microstructure of silicon nitride based ceramics after processing. They are usually located in glassy regions which are siliceous solidified sintering aid liquid, and usually contain a small (∼100nm) a-Si3N4 crystal. These nitride crystals are considered to be seeds, incompletely dissolved in the melt, that are heterogeneous nucleation sites for the oxynitride crystals. We present here the first observations of morphological and crystallographic habits between the seed nanocrystals and the host oxynitride laths.Fig. 1 shows a typical oxynitride lath containing a nitride seed crystal. The lath is surrounded by glass and ß-Si3N4 particles, and a small cristobalite particle (a minor constituent). This microstructure is from an Si02-Si3N4 ceramic processed with Al2O3 sintering aid. The same oxynitride lath/seed structures were observed when other sintering aids (eg. Y2O3, MgO, ZrO2) were used, so they are independent of sintering aid.


Sign in / Sign up

Export Citation Format

Share Document