Formation of the suzuki phase on the solid-liquid interface of czochralski grown crystals

Al28 mine the chemical composition of solid surfaces and large adsorbed organic molecules. The kinetic energy distribution of model species emitted agrees qualitatively with experiment and as predicted by the transport theory of Sigmund. The simulations suggest that the sputtered clusters.are more likely to represent the undisturbed surface as the primary beam collides at smaller angles.

Surface Science 105 (1981) 240-264 North-Holland Publishing Company THE STUDY OF OXIDE FORMATION

ON (OOl), (01 l), (111) AND (113)

SURFACES OF Cr THIN FILMS USING STEM-MICRODIFFRACTION METHODS Fumio WATARI and J .M. COWLEY Department

of Physics, Arizona

State University,

Tempe, Arizona

85281,

USA

Received 13 May 1980; accepted for publication 1.5 October 1980 The process of oxidation on the surfaces of thin Cr films with (OOl), (Oil), (111) and (113) orientations, prepared by evaporation, has been studied by use of a scanning transmission electron microscopy (STEM) instrument. Micro-diffraction patterns observed by use of an optical image analyzer attachment permit the identification of oxide phases and reveal their epitaxial relationship to the Cr substrate. A spinel-like oxide grows as a thin layer on the Cr surface in the early stages of oxidation but disappears on further oxidation when the rhombohedral CrzOs phase predominates. The epitaxial orientation relationships of these oxides and the Cr are explainable in part in terms of the relationships of the crystal structures. The mechanism for the formation of the oxides may be deduced.

Surface Science 105 (1981) 2655274 North-Holland Publishing Company FORMATION

OF .THE SUZUKI PHASE ON THE SOLID-LIQUID

OF CZOCHRALSKI

INTERFACE

GROWN CRYSTALS

G. GRANGE Cenrre de Recherche Universitaire

sur les Mkanismes de la Croissance Cristalline, CNRS, Campus de Lrtminy, Case 913, F-13288 Marseille Cidex 9, France

Received 10 September 1980; accepted for publication 8 December 1980 Decantation by an argon bubble and subsequent gold decoration allow the direct observation of decoration patterns of the Suzuki phase on the {loo} crystal-melt interfaces. The appearance and the concentration of the Suzuki phase precipitates on the interfaces and cleaved surfaces are compared. The shape and surface morphology of these precipitates as well as some growth mechanisms for their formation on the interfaces are discussed.