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Erschienen in:
01.04.2010 | HTC2009
Effect of oxygen on the molten BGO/Ir wetting and sticking
Erschienen in: Journal of Materials Science | Ausgabe 8/2010
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Abstract
In order to better understand the BGO-crucible interaction, the wetting of the molten BGO on Ir substrates has been studied by the sessile drop method at 1050 °C. It was found that the oxygen partial pressure in the surrounding atmosphere is an important parameter. For \( P_{{{\text{O}}_{ 2} }} \) > 0.1 mbar, full wetting is observed without any visible contact angle. X-ray diffraction analyses have shown that Bi2Ir2O7 is formed at the interface. For \( P_{{{\text{O}}_{ 2} }} \) < 0.1 mbar, a drop is observed with a contact angle of 70° and no chemical reaction is detected. Attempts to grow BGO samples under low oxygen partial pressure resulted in ingot without sticking with the crucible.