The origin and growth of lineage structures in melt-grown crystals

Jaffrey, D.; Chadwick, G. A.

doi:10.1080/14786436808227462

Cited by 22 publications

(3 citation statements)

References 23 publications

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“…The lineage defect formed was of the order of 104-105 m/m2 and was longer in the 3N's films than in the 6N's films. This suggests that the lineage defect also originates from chemical inhomogeneity introduced during melt growth [29][30][31]. As to the effects of small temperature oscillation and cooling rate on the lineage formation, we cannot obtain any definite conclusion.…”

Section: Physics Abstractsmentioning

confidence: 51%

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Observation of Melt Growth Process of Bi and Sn Thin Films

Sugawara

Watanabé

1993

Microsc. Microanal. Microstruct.

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Abstract. 2014 We observed melt-growth process of Bi and Sn thin films by in-situ transmission electron microscopy. After preparing the films with some specified orientations from bulk single crystals of Bi (99.9 and 99.9999 %) and Sn (99.999 %), we partially melted and regrew them by cooling at a nearly constant rate in an electron microscope. In the Bi films, a growing solid-liquid interface was observed to be concave toward melt more frequently than faceted. The movement of the curved interface was sensitive to small fluctuations of the falling temperature, while the faceted interface was insensitive. During the melt growth various crystal defects were introduced, and their density depends on the orientation, purity of films and the cooling condition. In the Sn films, a growing interface was always curved. The defects formed were confined to lineage defects, of which formation was not influenced by the cooling rate but by the film orientation.

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Section: Physics Abstractsmentioning

confidence: 51%

“…Their average density was of the order of 1010-1011 m-2 and was higher in the low purity material, probably because dislocations would originate from chemical inhomogeneity in the impure crystal [29][30][31].…”

Section: Physics Abstractsmentioning

confidence: 99%

Observation of Melt Growth Process of Bi and Sn Thin Films

Sugawara

Watanabé

1993

Microsc. Microanal. Microstruct.

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“…Following exactly the assumptions used to describe the binary alloy case, we can relate concentration gradient to temperature gradient for each minor component in equations analogous to equation (6). These are applicable in the liquid between the two-…”

Section: Ternary Alloysmentioning

confidence: 99%

Growth of Multicomponent Composites from the Melt.

Young¹,

Dunn²,

Buchakjian³

et al. 1975

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The Morphological and Crystallographic Aspects of Eutectic Solidification

Double¹

1974

Cryst Res and Technol

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In binary eutectic alloys one is concerned with a particular phase reaction in which a liquid freezes a t an invariant temperature t o give an intimate mixture of two solid phases a and p. I n different eutectic alloys the distribution of the two phase gives rise to a wide variety of microstructures, and even for a particular alloy the type of microstructure obtained is often a sensitive function of the imposed freezing conditions. With this diversity of microstructures, the classification of eutectic systems into specific categories has always proved to be a problem. JACKSON and HUNT 1966a have shown however t h a t a useful basis for understanding eutectic micromorphologies can be obtained from a consideration of the growth forms commonly adopted by the individual elements when in equilibrium with their own melt. In particular, whether they tend to freeze in a faceting or non-faceting manner, an indication of this being obtained from their entropies of fusion. Thus, eutectic alloys are divided into three categories :1. Non-facetinginon-faceting combinations 2 . Facetinglnon-faceting combinations 3. Facetinglfaceting Combinations .The classification is by no means rigorous, but within certain limitations it is found that most eutectic systems can be assigned to one of the three groups, and within any one group the alloys have certain microstructural characteristics in common. Thus, group 1 (low entropies of fusion -non-faceting combinations)contains all metal-metal eutectics and many metal-intermetallic systems as well as certain organic and inorganic systems: these tend to develop regular microstructures -lamellar, fibrous or structures intermediate between thesewith the phases generally aligned in the growth direction. The two phases freeze side by side, and the factors determining their growth pattern are the direction of heat flow, the interdiffusion of the two components in the liquid phase and to some extent the crystallographic orientation relationships between the phases. Because growth of the two phases is similarly isotropic and non-faceted, these eutectic systems can adopt a closely coupled and co-operative mode of growth a t a stable duplex front -and this is reflected in the regularity of their freezing patterns. Systems in group 2 contain one faceting phase (high entropy of fusion) and examples are mainly metallnon-metal combinations such as Pe(Ni)-C.

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The origin and growth of lineage structures in melt-grown crystals

Cited by 22 publications

References 23 publications

Observation of Melt Growth Process of Bi and Sn Thin Films

Observation of Melt Growth Process of Bi and Sn Thin Films

Growth of Multicomponent Composites from the Melt.

The Morphological and Crystallographic Aspects of Eutectic Solidification

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