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whole, the accumulation of these observations has led to the emergence of a “new chemistry” specific to the high and very high temperature domain. This “new chemistry” may be complex and different from the chemistry to which students are usually introduced in their elementary courses of inorganic and physical chemistry. New and often complex species and solid phases appear, whose stability is only obtained under high temperature conditions. The sequence of topics presented here represents subjects that could be included for teaching at various levels of in-depth study in the university curricula for students in chemistry, industrial chemistry and materials science. The arrangement of the topics starts from the behaviour of materials at high temperatures that historically represents the emergence of the field of research known as high temperature materials chemistry; it then gradually widens parallel to the evolution of inorganic materials science towards new directions. During the past decades, high temperature science has continued to grow into an active interdisciplinary field concerned with the investigation, correlation and prediction of a multitude of chemical and physical phenomena. High temperature science is ubiquitous to many processes and applications, such as heat engines, combustion, nuclear power generation, high temperature fuel cells, chemical plant and processes, etc., as well as to many geological and cosmo-chemical processes. Notwithstanding the well- known difficulties in making experiments at high and very high temperatures, the availability of reliable experimental data for binary and ternary compounds in gases and solid phases has increased considerably in the last two to three decades. Moreover, the study of high temperature materials has benefitted more recently from the parallel development of prediction models, simulation techniques and effective use of theoretical first-principles


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