Web-dendritic ribbon growth. Annual report, October 1, 1975--September 31, 1976
The web furnace has been set up, calibrated, and made operational for pulling dendritic-web samples. Considerable work has been completed in the investigation of the effect of changes in the furnace thermal geometry, as accomplished by variations in the number, size, shape, and location of thermal shields, on the growth of dendritic-web. Numerous growth runs were made to grow primitive dendrites for use as the dendritic seed crystals for the web growth. Some preliminary investigations were conducted to try and determine the optimum twin spacing in the dendritic seed crystal for web growth. Models were developed and computer programs applied to ascertain the thermal geometries present in the susceptor, crucible melt, meniscus, and web. A major result of this analysis has been the prediction of an upper limit on the pull rate of approximately 4 cms. per minute with the thermal geometry presented in our furnace. The facilities for obtaining characterization data were set-up and made operational. Data on twin spacings and number of twin planes in the dendritic seed crystals and resulting web samples was obtained. Resistivity and majority charge carrier type determinations were made on a few select web samples. All samples to date have been high resistivity, undoped, p-type. (WDM)
- Research Organization:
- South Carolina Univ., Columbia (USA). Coll. of Engineering
- DOE Contract Number:
- NAS-7-100-954344
- OSTI ID:
- 8194062
- Report Number(s):
- ERDA/JPL/954344-76/3
- Country of Publication:
- United States
- Language:
- English
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