Reference electrode for electrochemical determination of oxygen partial pressure in an ionic melt

US5580439A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Friedrich G. K. Baucke · Schlotheim, DE
• Thomas Pfeiffer · Kumhausen, DE
• Sylvia Biedenbender · Bingen, DE
• Gernot Roth · Oppenheim, DE
• Ralf Werner · Hilden, DE

Key dates

• Filing date: Sep 15, 1995
• Grant date: Dec 3, 1996
• Expiry date: Sep 15, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4117
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The method of electrochemical determination of oxygen partial pressure in ionic melts includes providing a metal/metal oxide reference electrode consisting of an electrode body made of a metal selected from the group consisting of Mo, W, Hf, Nb and Ta and alloys thereof and a layer of an oxide of that metal on the electrode body; immersing a pure platinum electrode and the metal/metal oxide reference electrode in a glass melt; measuring a potential across the metal/metal oxide reference electrode and the pure platinum electrode immersed in the glass melt to obtain a measured potential characteristic of the oxygen partial pressure in the glass melt; obtaining a calibration curve relating the potential across said reference electrode and the pure platinum electrode to the oxygen partial pressure in the glass melt as a function of temperature; and obtaining the oxygen partial pressure in the glass melt from the measured potential and the calibration curve. Either the calibration curve is obtained experimentally by immersing a Zirconium dioxide electrode in the glass melt and measuring a potential difference between the metal/metal oxide reference electrode and the Zirconium dioxide el…