MRS Medals to Cross and Pennycook
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MRS Medals to Cross and Pennycook The MRS Medal Award was established to recognize a distinguished recent innovative achievement or discovery which is expected to have a major impact on the progress of any materials-related field. For 1992, two MRS Medal awards have been announced. They go to: L. Eric Cross, professor of electrical engineering, Pennsylvania State University, "in recognition of his leadership and vision in the atomic scale engineering of relaxor ferroelectric materials as the prototype of selfassembling nanocomposites," and Stephen J. Pennycook, Oak Ridge National Laboratory, "for the development and application of incoherent (Z-contast) imaging in the scanning transmission electron microscope for direct determination of the atomic scale structure and chemistry of materials and interfaces." Cross pioneered the development of the composite PZT+ polymer transducer, which for the first time enhanced the figure of merit of an electroceramic product by more than three orders of magnitude. Subsequently, he and his group established the physics and mathematics for the tailor-making of a whole suite of highperformance electroceramic composite devices. Much of the basic physics and the derived engineering of the relaxor family of composites based on lead magnesium niobate were developed by Cross. This work has already had a substantial impact in fields as diverse as medical diagnostic transducers, piezo motors, actuators, micro- and nano-displacement research devices, deformable mirrors, ink jet printing, infrared imaging systems, and smart sensors. Cross and his colleagues have been key innovators in opening up the whole rapidly advancing field of smart materials. Cross received his BSc and PhD degrees from Leeds University. He continued his research at Leeds for several years before joining Pennsylvania State University in 1961. He now serves as Evan Pugh Professor of Electrical Engineering and has served as director of the Materials Research Laboratory at that university. Cross is a Fellow of the American Physical Society, the American Ceramic Society, IEEE, and the American Optical Society. He was elected to the National Academy of Engineering in 1983. Pennycook, through the development of high-resolution incoherent (Z-contrast) imaging in the STEM, achieved a major long-term goal of electron microscopy: atomic resolution in a chemically sensitive
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image which is directly and easily interpretable. This, in turn, constitutes a major advance for virtually every branch o
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