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Title: Kinetics, morphology and thermodynamics of the solid-liquid transition of non-metals. Progress report, March 1, 1979-February 28, 1980

Abstract

Some previous work on Internal Centrifugal Zone Growth was documented. New calculations have been made to show that for large rf skin depths, the temperature of the sample depends in a systematic way on only three dimensionless parameters; these characterize the rf power level, the surface heat transfer coefficient, and the ambient temperature. Critical values are given for the ambient temperature below which curves of sample temperature versus RF power level are S-shaped. Based on this improvement in understanding, our previous numerical results, valid for arbitrary skin depths, are being prepared for publication. Work continues toward the measurement of the solid-liquid surface tensions of non-metallic materials via the grain-boundary groove technique. Degassed samples of GeO/sub 2/ have been obtained, but the necessary temperature caused damage to the quartz tube in our present apparatus, necessitating a new design. While the new apparatus is under construction, sodium sulfate will be used as a prototype material to enable work on the optical system. Use of an astronomical telescope in conjunction with the optical viewpoint leads to poor image quality so we are considering the substitution of a microscope with a large working distance. Previous difficulties with numerical calculation of the temperature profiles inmore » the system have been alleviated by using finer grid sizes for the finite difference scheme. Further effort has been expended to form the basis of new work on the application of Onsager's theory of reciprocity to transport phenomena in solids.« less

Authors:
Publication Date:
Research Org.:
Carnegie-Mellon Univ., Pittsburgh, PA (USA)
OSTI Identifier:
6017705
Report Number(s):
COO-2407-8
TRN: 79-021482
DOE Contract Number:  
EY-76-S-02-2407
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GERMANIUM OXIDES; CRYSTAL GROWTH; SURFACE TENSION; CERAMICS; DEGASSING; EQUIPMENT; GRAIN BOUNDARIES; HEATING; LIQUIDS; MELTING; MORPHOLOGY; SOLIDS; THERMODYNAMIC PROPERTIES; CHALCOGENIDES; CRYSTAL STRUCTURE; FLUIDS; GERMANIUM COMPOUNDS; MICROSTRUCTURE; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; SURFACE PROPERTIES; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360204 - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Sekerka, R.F.. Kinetics, morphology and thermodynamics of the solid-liquid transition of non-metals. Progress report, March 1, 1979-February 28, 1980. United States: N. p., 1979. Web. doi:10.2172/6017705.
Sekerka, R.F.. Kinetics, morphology and thermodynamics of the solid-liquid transition of non-metals. Progress report, March 1, 1979-February 28, 1980. United States. doi:10.2172/6017705.
Sekerka, R.F.. Wed . "Kinetics, morphology and thermodynamics of the solid-liquid transition of non-metals. Progress report, March 1, 1979-February 28, 1980". United States. doi:10.2172/6017705. https://www.osti.gov/servlets/purl/6017705.
@article{osti_6017705,
title = {Kinetics, morphology and thermodynamics of the solid-liquid transition of non-metals. Progress report, March 1, 1979-February 28, 1980},
author = {Sekerka, R.F.},
abstractNote = {Some previous work on Internal Centrifugal Zone Growth was documented. New calculations have been made to show that for large rf skin depths, the temperature of the sample depends in a systematic way on only three dimensionless parameters; these characterize the rf power level, the surface heat transfer coefficient, and the ambient temperature. Critical values are given for the ambient temperature below which curves of sample temperature versus RF power level are S-shaped. Based on this improvement in understanding, our previous numerical results, valid for arbitrary skin depths, are being prepared for publication. Work continues toward the measurement of the solid-liquid surface tensions of non-metallic materials via the grain-boundary groove technique. Degassed samples of GeO/sub 2/ have been obtained, but the necessary temperature caused damage to the quartz tube in our present apparatus, necessitating a new design. While the new apparatus is under construction, sodium sulfate will be used as a prototype material to enable work on the optical system. Use of an astronomical telescope in conjunction with the optical viewpoint leads to poor image quality so we are considering the substitution of a microscope with a large working distance. Previous difficulties with numerical calculation of the temperature profiles in the system have been alleviated by using finer grid sizes for the finite difference scheme. Further effort has been expended to form the basis of new work on the application of Onsager's theory of reciprocity to transport phenomena in solids.},
doi = {10.2172/6017705},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 01 00:00:00 EDT 1979},
month = {Wed Aug 01 00:00:00 EDT 1979}
}

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