摘要:
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 electrode at a plurality of temperatures or theoretically from thermodynamic data for the metal/metal oxide reference electrode.
摘要:
To provide an improved ion exchange process for the gentle treatment of phosphate-containing glass substrates in salt melts, the invention provides a process in which the source for the ions used is a salt melt 10 which contains silver ions, wherein the salt melt 10 contains ammonium ions. Furthermore, the invention provides a glass material (100) which comprises a phosphate-containing glass (1) and at least one region (210) which contains at least a first composition of ions and at least one region (220) which contains at least a second composition of ions, producible by the process according to the invention.