Highlights of IBMM '86
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IBMM '86 Conference Chairman, Emanuele Rimini (left) of the University of Catania presides over question-and-answer exchange following Mayer's keynote speech. The welcoming address was given by the Rector of the Catania University, Gaspare Rodolico. He mentioned the development of physics in Catania and the relevance of these exchanges for the progress of science. He concluded his address by presenting, on behalf of Catania University, a silver medal to Jim Mayer with the following statement: "To Professor James W. Mayer for the long, fruitful and illuminating collaboration
Rector of the University of Catania, Gaspare Rodolico (facing) presents silver medal to James W. Mayer of Cornell University. PACE 28, MRS BULLETIN, JULY/AUGUST 1986
w i t h t h e p h y s i c i s t s of t h e C a t a n i a Aetheneum." The collaboration started 15 years ago between Mayer and Rimini and h a s b e e n c o n t i n u e d w i t h Foti and Campisano. Mayer then took the podium and got the conference off to a lively start with a review of his group's work on metastable phase formation by ion beam mixing. He described how Ne and Xe beams are used to mix samples consisting of inter-wedgeshaped metal films to give a continuum of possible compositions and concluded, among o t h e r things, that equilibrium phases with two atoms per unit cell were the most likely to form. Several additional talks and a poster session were devoted to trying to understand the mixing process: why metals mix or fail to mix and why some phases are amorphous after mixing. Formation of metastable icosahedral phases of AIMn by ion beam mixing was also reported. Since icosahedral unit cells cannot be used to fill three-dimensional space, the exact structure and the properties of these "quasicrystals" have generated much interest. Another popular topic in this session was the use of ion beam mixing of metal overlayers on Si to form silicides at temperatures lower than the thermal reaction temperature. In his presentation, Mayer raised the question, "how amorphous is amorphous?" Several aspects of this problem were addressed throughout the conference. The current understanding of the delicate balance between beam-induced crystallization and amorphization of silicon was reviewed. continued
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CONFERENCE REPORTS offers blanket exposure with a step-andrepeat option and therefore a considerable speed advantage over FIBs. It may be that the two technologies will find different niches: FIBs in custom 1C repairs, and ion beam lithography for large area implants. The conference was a nice size: large e n o u g h to bring us up to date on a reasonable cross section of topics, but small enough to allow us to meet and exchange ideas with many of our distant colleagues. The ongoing development work on new machines (such as high current oxygen implanters and 2 MeV ion implanters) and new fabrication techniques (such as incorporation of ion beams in MBE growth) promise a very exciting technical program at the next IBMM meeting. The IBMM international committee announced that IBM
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