This volume constitutes the Proceedings of the Sixth University Conference on Ceramic Science which was held at North Carolina State University in Raleigh, December 7-9, 1970. Previous host institutions and resultant publications in this ongoing series have been: 1. North Carolina State University, November 16-18, 1964. W. W. K:r>iegeZ and H. PaZmour III~ Eds. ~ The RoZe of Grain Boundaries and Surfaaes in Ceramias. 631 pp.~ Mater'iaZs Saienae Researah~ Vol-. 3~ PZenwn P1'eSs~ New York~ 1966 . * 2. University of Notre Dame, June 21-23, 1965. G. C. Kuazynski~ N. A. Hooten and C. F. Gibbon~ Eds.~ Sintering and ReZated Phenomena~ 894 pp. Gordon and Breaah Saienae PubZishers~ Ina.~ New York~ 1967. 3. University of California at Berkeley, June 13-16, 1966. R. M. FuZrath and J. A. Pask~ Eds.~ Ceramia ~arostruatures- Their AnaZysis~ Signifiaanae and Produatidn. 1008 pp. John WiZey & Sons~ Ina.~ New York~ 1968. 4. State University of New York, College of Ceramics at Alfred University, June 18-23, 1967. T. J. Gray and V. D. Freahette~ Eds.~ Kinetias of Reaations in Ionia SoZids. 571 pp. MateriaZs Saienae Researah~ VoZ. 4~ PZenwn Press~ New York~ 1969. 5. University of Florida, Novem1:>er 10-14, 1969. L. L. Henah and D. B. Dove~ Eds.~ Physias of EZeatronia Ceramias. M. Dekker~ Ina. (In Press).