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The Morphology of Freeze-Dried Rubidium Chloride Powder

Published online by Cambridge University Press:  21 February 2011

J. K. G. Panitz ,
J. A. Voigt ,
F. A. Greulich ,
M. J. Carr  and
M. O. Eatough
J. K. G. Panitz
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
J. A. Voigt
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
F. A. Greulich
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
M. J. Carr
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
M. O. Eatough
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
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Abstract

We have formed powders of a strongly ionic compound, RbCl by freezedrying. Stock solutions, varying from very low concentrations with 4 gm RbCl reagent dissolved in 100 cc water to saturated solutions with 80 gm reagent in 100 cc water, were sprayed into isopentane at -160°C. The droplet size in the spray was varied from relatively large 4-mm diameter droplets to extremely small droplets in an aerosol spray. It was determined that both the concentration of the stock solution and the droplet size affect the average size and the size distribution of the primary particles formed and the way in which these primary particles are bonded together. Unlike the powders of many less ionic compounds that are produced by freeze-drying, the primary particles in these RbCl powders are crystalline rather than amorphous. Analysis with an x-ray diffractometer with a cold stage indicates that crystallization occurs during the freezing cycle rather than during the sublimation period of the freeze-drying process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 155: Symposium L – Processing Science of Advanced Ceramics , 1989 , 37
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

1. Johnson, D. W. Jr., and Gallagher, P. K., Ch. 12, “Reactive Powders from Solution,” Processing of Crystalline Ceramics (Materials Science Research, 11) eds. Palmour, Hayne III, Davis, R. F., and Hare, T. M., Plenum Press, New York, NY (1978) 125.Google Scholar
2. Lloyd, I. K. and Kovel, R. J., J. of Materials Science 23 (1988) 185.Google Scholar
3. Rigterink, M. D., Ceramic Bulletin 2 (1972) 158.Google Scholar
4. Johnson, D. W. and Schnettler, F. J., J. American Ceramic Society 53, 8 (1970) 440.Google Scholar
5. Rasmussen, M. D., Akins, M., and Berard, M. F., Ceramics Int'l. 10 3 (1984) 99.Google Scholar
6. Rakotoson, L. and Paulus, M., Advances in Ceramics 12 (1984) 727.Google Scholar
7. Roosen, A. and Hausner, H., “The Influence of Processing Conditions on the Sintering Behavior of Co-precipitated Calcia-Stabilized Zirconia Powders,” Ceramic Powders, ed. Vincerzini, P., Elsevier Scientific Publishing Co., Amsterdam, The Netherlands, (1983) 773.Google Scholar
8. Lacour, C. and Paulus, M., Science of Sintering II, 3 (1979) 193.Google Scholar
9. Paulus, M., Ch. 3 “Freeze-Drying: A Method for the Preparation of Fine Sinterable Powders and Low Temperature Solid State Reaction,” Fine Particles Processing, ed. Somasundaran, P., American Institute of Mining, Metallurgical and Petroleum Engineers, Inc., New York, NY (1980) 27.Google Scholar
10. Powder Diffraction File, International Centre for Diffraction Data, 1601 Park Lane, Swarthmore, PA 19081–2389.Google Scholar
11. Nielsen, A. E., Kinetics of Precipitation, The MacMillan Company, New York, NY (1964).Google Scholar