Convective effects and traveling waves in transparent oxide materials processed with the floating zone technique

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Zone melting (or zone refining or floating zone process, FZ) is a group of similar methods, specifically conceived for the purification of crystals, in which thermally-driven flows of both gravitational and surface-tension natures are typically produced when the considered material is processed. Since the melt never comes into contact with anything but vacuum (or inert gases), there are no contaminants that the melt may incorporate. Even though compounds with higher purity and improved quality can be obtained with this technique, a typical drawback is represented by the defects potentially induced in the crystalline structure by the unavoidable convection emerging in the fluid phase. In the present chapter, special attention is paid to a specific category of materials known as transparent oxides. A range of conditions is explored, differing in the dominant effect (buoyancy or Marangoni flow), the thermal conditions (heating being provided along the radial or axial direction) and the relative direction of gravity and applied temperature gradient. The hallmark of the entire chapter is our commitment to identify situations in which “waves” are produced and provide a systematic classification of such convective instabilities together with a description of related features based on advanced numerical simulations.
LanguageEnglish
Title of host publicationRecent Studies in Materials Science
EditorsPatrick R. Lind
Place of PublicationHauppauge, NY
Chapter2
Pages97-150
Number of pages54
Publication statusPublished - 30 Mar 2019

Publication series

NameMaterials Science and Technologies

Fingerprint

Zone melting
Oxides
Noble Gases
Inert gases
Buoyancy
Thermal gradients
Contacts (fluid mechanics)
Purification
Surface tension
Gravitation
Vacuum
Impurities
Crystalline materials
Heating
Defects
Crystals
Fluids
Computer simulation
Direction compound
Hot Temperature

Keywords

  • zone melting
  • vacuum
  • crystalline structure
  • transparent oxides

Cite this

Lappa, M. (2019). Convective effects and traveling waves in transparent oxide materials processed with the floating zone technique. In P. R. Lind (Ed.), Recent Studies in Materials Science (pp. 97-150). (Materials Science and Technologies). Hauppauge, NY.
Lappa, Marcello. / Convective effects and traveling waves in transparent oxide materials processed with the floating zone technique. Recent Studies in Materials Science. editor / Patrick R. Lind. Hauppauge, NY, 2019. pp. 97-150 (Materials Science and Technologies).
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Lappa, M 2019, Convective effects and traveling waves in transparent oxide materials processed with the floating zone technique. in PR Lind (ed.), Recent Studies in Materials Science. Materials Science and Technologies, Hauppauge, NY, pp. 97-150.

Convective effects and traveling waves in transparent oxide materials processed with the floating zone technique. / Lappa, Marcello.

Recent Studies in Materials Science. ed. / Patrick R. Lind. Hauppauge, NY, 2019. p. 97-150 (Materials Science and Technologies).

Research output: Chapter in Book/Report/Conference proceedingChapter

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Lappa M. Convective effects and traveling waves in transparent oxide materials processed with the floating zone technique. In Lind PR, editor, Recent Studies in Materials Science. Hauppauge, NY. 2019. p. 97-150. (Materials Science and Technologies).