In situ monitoring technologies for ammonthermal reactors

Beitrag in einer Fachzeitschrift

Details zur Publikation

Autorinnen und Autoren: Alt NS, Meissner E, Schlücker E, Frey L
Zeitschrift: Physica Status Solidi (C) Current Topics in Solid State Physics
Jahr der Veröffentlichung: 2012
Band: 9
Seitenbereich: 436-439
ISSN: 1862-6351
eISSN: 1610-1642


We developed an optical cell which can be operated at real ammonthermal reaction conditions under high pressure (200MPa, 300MPa optional) and temperatures up to 650 °C. First video optical and spectroscopical studies were made to demonstrate the feasibility of in situ monitoring of the ammonothermal growth process of GaN with the optical cell. So far unknown parameters like e.g. flow velocity of the fluid could be investigated by simple imaging of particle movement. The in situ optical cell offers access to spectroscopic investigations or direct temperature measurements. First measurements show light absorption of chemical species in the reaction fluid in the UV to near IR range which changes with temperature and pressure implying that more than one intermediate species is present. The application of this optical cell is not restricted to a particular ammonothermal route but can be applied to either ammonothermal variant. An additional development was a reactor with five type K thermocouples to measure the temperature distribution directly in the reaction chamber up to 650 °C and 300 MPa. The flexibility of the thermocouples allows the measurements at nearly any point in the fluid. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Frey, Lothar Prof. Dr.
Lehrstuhl für Elektronische Bauelemente
Schlücker, Eberhard Prof. Dr.-Ing.
Lehrstuhl für Prozessmaschinen und Anlagentechnik


Alt, N.S., Meissner, E., Schlücker, E., & Frey, L. (2012). In situ monitoring technologies for ammonthermal reactors. Physica Status Solidi (C) Current Topics in Solid State Physics, 9, 436-439.

Alt, Nicolas S.A., et al. "In situ monitoring technologies for ammonthermal reactors." Physica Status Solidi (C) Current Topics in Solid State Physics 9 (2012): 436-439.


Zuletzt aktualisiert 2018-08-12 um 13:50