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

该研究项目的目的是发展对氨合成的基本了解，以了解和影响所涉及的过程，并获得科学见解，以实现高质量氮化物晶体生长的基本原理。基于对技术上感兴趣的新氮化物和相关化合物的合成的这些研究，这种合成路线，即在液态和超临界氨中发生的化学过程，将逐步开发和应用。此外，为了确定热力学和结晶数据，应根据技术实现情况，有条不紊地开发现场监测装置。这是第一次，在典型的氨合成条件下（高达300 MPa和600 °C），使用光学和射线照相分析可以跟踪反应器中正在进行的过程。为此，应开发新的设备，其中包括一种特殊的取样方法，以实现化学平衡。因此，在氨合成领域的发现将打开一扇新的大门，这将进一步导致新物质和材料的开发。因此，主要目标是澄清氨合成中涉及的工艺，以开发最佳实验设备和装置来支持这一目标，并最终获得氨系统中系统晶体生长的基本原理，以及开发新材料和最佳结晶工艺。

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.