Determination of GaN solubility in supercritical ammonia with NH4F and NH4Cl mineralizer by in situ x-ray imaging of crystal dissolution

Autor:	Nicolas S. A. Alt, Thomas G. Steigerwald, Benjamin Hertweck, Peter J. Wellmann, Eberhard Schlücker, Ulrike Künecke, Saskia Schimmel, Theresia M. M. Richter, Rainer Niewa, Michael W. Lindner
Rok vydání:	2015
Předmět:	Inorganic chemistry X-ray Condensed Matter Physics Supercritical fluid Inorganic Chemistry Crystal Ammonia chemistry.chemical_compound chemistry Materials Chemistry Gravimetric analysis Solubility Saturation (chemistry) Dissolution
Zdroj:	Journal of Crystal Growth. 418:64-69
ISSN:	0022-0248
DOI:	10.1016/j.jcrysgro.2015.02.020
Popis:	Quantitative data on the solubility of GaN in supercritical ammonia using NH 4 F as mineralizer are reported. The solubility is determined by in situ x-ray imaging of the dissolution of GaN single crystals. First, solubility values obtained by this method with NH 4 Cl as mineralizer are presented and discussed with respect to existing literature data. Monitoring the dissolution process in situ reveals the time when the solubility limit is reached. Thus, it allows to distinguish the saturation of the solution from dissolution based on mass transport and deposition. This is a key advantage of solubility measurements by in situ x-ray imaging compared to gravimetric methods. Our results indicate that the solubility limit is reached much faster than usually assumed in gravimetric solubility studies and the solubility of GaN in ammonothermal media is significantly lower than reported so far.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2e85a960d534eea0eaf8d03533159b91 https://doi.org/10.1016/j.jcrysgro.2015.02.020 Zobrazit plný text záznamu Full Text from ScienceDirect