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book review John S. McCloy Guest columnist Review of “Magma Redox Geochemistry” In their recent book “Magma Redox Geochemistry,” editors R. Moretti and D. Neuville have compiled a timely and useful set of scholarship focused on vari- ous aspects of inorganic chemistry and oxidation-reduction reactions as they apply to chemical, physical, and geologi- cal processes affecting magma, the life- blood of the Earth. The book, which brings together 32 authors from France, Germany, Italy, Switzerland, Australia, the United States, and Canada, offers 19 chapters separated into three parts: “Redox from the Earth’s Accretion to Global Geodynamics,” “Redox at Work: From Magma Sources to Volcanic Phenomena,” and “Tools and Techniques to Characterize the Redox and its Effect on Isotope Partitioning.” Though targeted at the earth sciences communities working on understanding Earth’s dynamic processes, there is much here of interest to ceramic and glass scientists and engineers. For example, in industrial glass-melting and fining, redox effects of sulfur and iron are equally as important as they are in influencing out- gassing, magma rise, and volcano erup- tive character. Likewise, the behavior of volatiles such as halogens and water influence melting in earth systems as well as nuclear waste vitrification. The effect of redox on melt-crystal partition- ing permits establishing oxygen fugacity in natural systems and also effects glass melt interaction with melter refractory, specifically for transition metals in spinel crystals, as well as phases produced in technical glass-ceramics. The techniques for measuring oxida- tion state summarized in this volume are equally useful for many in the technical ceramics and glass communi- ties. While the most important redox sensitive elements in natural systems may be carbon/carbonate, hydrogen/ water, iron, and sulfur, other transition metals (titanium, vanadium, chromium, tungsten, molybdenum, rhenium, palla- dium), lanthanides (cerium, europium), and actinides (uranium) play a forensic and a dynamic role in both natural systems and complex systems, such as nuclear waste glass melts. Natural pro- cesses discussed here, including mixing of aqueous fluids and silicate melts, degassing, fractionation, and crystalliza- tion, all have analogues in controlled technical processes. Additionally, the consequences of Earth’s natural pro- cesses involving redox are the distribu- tion of metals in ore bodies used as raw materials in ceramic products. Overall, the technical issues described in this volume have very strong relevance to many cera- mists, and the editors are applauded for putting together such a high- quality volume complete with varied chapters and high-quality illustrations. A mix of fundamental and applied studies, this volume offers much for our community, as nearly all structural and functional ceramic and glass materials contain at least one redox sensitive element, influencing optical, electrical, and mag- netic properties, as well as processing parameters such as foam- ing, viscosity, and crystallization that we seek to control. Whether you deal with electrochemistry and batteries or crystal chemistry and thermodynamics, this volume will provide both excellent method summaries directly applicable as well as an introduction to fascinating adjacent areas of scientific inquiry. Book info Magma Redox Geochemistry, edited by R. Moretti and D. Neuville, Geophysical Monograph 266, American Geophysical Union and Wiley, 2021. John S. McCloy is Lindholm, Herman & Brita Endowed Chair in Materials Engineering and director of the Institute of Materials Research at Washington State University. n American Ceramic Society Bulletin, Vol. 101, No. 2 | www.ceramics.org 37PDF Image | hydrogen as an alternative fuel
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