Contents

11 January 1974
Vol 183, Issue 4120

About The Cover

Nomarski interference-contrast icrograph of an aluminum-silicate mixture of stoichiometric mullite composition showing peritectic microstructure formed by slow cooling of homogenized melt.Interpritation of such microstructures with the aid of diffusion cuople technique result in a new Sio2-Al2O3 phase diagram (about X 1200). See page 69. [Ilhan A.Aksay and Joseph A.Pask,Department of Material Science and Engineering and Inorganic Materials Research Division,Lawrence Berkley Laboretory,University of California, Berkley]