SpringerImages - A plot of water content in glasses as a function of quench pressure PF. The water contents were measured by FTIR spectroscopy in six experiments of the 27.8 kPa/s series (empty circles), and two experiments of the 1,000 kPa/s series (solid circles); the error bars correspond to twice the standard deviation (see Table ). The range of water contents measured in starting glasses (5.95 to 6.15 wt%) is indicated by the shaded area. The solubility of water in Güney Daği composition at 800°C (thick line) was computed using Zhang’s (1999) model. The nucleation pressures in the two series are shown by the dashed vertical line at 69 MPa (27.8 kPa/s series) and by the dotted vertical line at 63 MPa (1,000 kPa/s series)

Caption

Fig 5

A plot of water content in glasses as a function of quench pressure P_F. The water contents were measured by FTIR spectroscopy in six experiments of the 27.8 kPa/s series (empty circles), and two experiments of the 1,000 kPa/s series (solid circles); the error bars correspond to twice the standard deviation (see Table ). The range of water contents measured in starting glasses (5.95 to 6.15 wt%) is indicated by the shaded area. The solubility of water in Güney Daği composition at 800°C (thick line) was computed using Zhang’s (1999) model. The nucleation pressures in the two series are shown by the dashed vertical line at 69 MPa (27.8 kPa/s series) and by the dotted vertical line at 63 MPa (1,000 kPa/s series)

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Water contents are plotted as a function of quench pressure P_F in Fig. 5 .

(3) The evolution of water contents at 1,000 kPa/s is similar to that described at 27.8 kPa/s (Fig. 5 ).

The water contents measured in our 27.8 kPa/s series provide a good illustration of this process (Fig. 5 ).

The water contents measured in our 27.8 kPa/s series show, however, that Δ X rapidly drops to a few 0.1 wt% as soon as the nucleation pressure is crossed (Fig. 5 ): so degassing proceeds close to equilibrium below P_N .

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