Solubility Limits of La and Y in Aluminum Oxynitride at 1870°C
The solubility limits of important dopants (La and Y) in aluminum oxynitride (AlON) were measured using wavelength-dispersive spectroscopy (WDS) mounted on a scanning electron microscope, from samples quickly cooled from 1870°C. To provide saturated AlON, samples were prepared with dopant concentrations well above the solubility limit, which was confirmed by the appearance of secondary phases using X-ray diffraction, backscattered electron micrographs, and WDS. Measurements were conducted on polished samples without thermal or chemical etching. The results indicate solubility limits of 498±82 and 1775±128 ppm for La and Y in AlON at 1870°C, respectively. The solubility limit of Mg in AlON at 1870°C was found to be >4000 ppm. The relation between solubility limit and cation size is briefly discussed.
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Document Type: Research Article
Affiliations: Department of Materials Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel
Publication date: May 1, 2008