This review is the sixth in a series on Móssbauer spectroscopy published in Analytical Chemistry. As before, the coverage largely includes the literature of the previous two years (1974)(1975). The size of this review, however, has been reduced by eliminating most of the tables and narrowing the selection of references (from 839 references in the previous review (S42) to only 424 in the current one). The smaller size reflects the growing difficulty of adequately covering the ever-increasing number of Móssbauer papers being published. There has been a 10% increase in volume over the 1972-1973 period. Many more papers are being devoted to applications of Móssbauer spectroscopy ana fewer with the refinement of theories relevant to the Móssbauer effect. Applications have become more and more diverse, moving from the original ones in physics and chemistry, into such fields as mineralogy, biology, metallurgy, and archaeology. Móssbauer spectroscopy is also being used for detailed studies of phase transitions, surfaces, pottery, soils, air samples, catalysts, chemical reactions, the radiation damage process, impurities, biological structures, and colloids, among others. John G. Stevens Is an associate professor of chemistry at the University of North Carolina at Asheville. He received his B.S. (1964) degree In chemistry and Ph.D. (1969) In physical chemistry from North Carolina State University. He has spent three summers at Argonne National Laboratory and a leave of absence at Max-Planck-lnstitüt Für Festkorperforschung. His main research interest is Mbssbauer spectrometry and its application to the study of antimony compounds, frozen solutions and minerals. He heads the Mbssbauer Effect Data Center from where he coedits the "Mbssbauer Effect Data Index" with V. E. Stevens. In addition he Is Involved with several data evaluation projects. He served on the Ad Hoc Panel on Mbssbauer Data Evaluation of the National Academy of Sciences. He is a member of ACS,
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