Ceramic liner technology for ammonoacidic synthesis

• Corrosion behaviour of several ceramics under ammonothermal conditions.
• Technical ceramics include: nitride and nitride bonded silicon carbide ceramics.
• Polycrystalline silicon carbide grown by physical vapor transport.
• Implementation of a novel lined vessel including experimental verification.
• Applicability for in situ X-ray imaging of gallium nitride crystal growth.

The ammonoacidic crystal growth is a comprehensive method for the synthesis of novel compounds like nitrides or amindes but also for the growth of bulk single crystals like gallium or aluminum nitride for power electronics and photonics. In this report we describe a novel liner technology for growth autoclaves, showing high potential for several research purposes. Thereby the applicability of several ceramic materials as liner materials was investigated for the first time. Moreover, the effectivity of the new apparatus was verified in experimental studies. The described concept based on a silicon nitride crucible is characterized by low costs and diverse possible applications. For example its use is of advantage in fundamental research to explore new nitride materials. Furthermore, it shows high potential for X-ray imaging to investigate basic principles in growth of gallium nitride.

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