FOR 1600: Chemistry and Technology of the Ammonothermal Synthesis of Nitrides

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Objective of the research project is to develop a basic understanding of the ammonothermal synthesis to understand and influence the processes involved, and to derive scientific insight in order to achieve the fundamentals for the growth of high quality nitride crystals. Based on these studies of the synthesis of technologically interesting, new nitrides and related compounds, this synthesis route, the chemical processes that take place in liquid and supercritical ammonia, shall be developed step by step and applied. Additionally, for the determination of thermodynamic and crystallisation data, in situ monitoring devices shall be methodically developed subject to technical realisation. For the first time, it should be possible to trace the ongoing process in the reactors at typical ammonothermal synthesis conditions (up to 300 MPa and 600 °C) using optical and radiographic analysis. For this purpose, new equipment shall be developed, which includes a special sampling method to allow chemical balancing. Thus, a new door to findings in the field of ammonothermal synthesis will be opened that will further lead to the development of new substances and materials. Therefore, the main objective is to clarify the processes involved in ammonothermal synthesis to develop optimal experimental equipment and apparatuses to support this objective and ultimately to obtain the fundamentals for a systematic crystal growth in the ammonothermal system as well as developing new materials and optimal crystallisation processes.