Effect of solution saturation state and temperature on diopside dissolution

Table 3 Pit Nucleation Model. Fitted parameters for equations 20 and 21 needed to describe diopside dissolution as a function of temperature.

ΔH_{α-homogeneous} = 749,700 mJ m^-2
ΔH_{α-defect assisted} = -91,644 mJ m^-2
E_{b-homogeneous} = 2.59 × 10^-16 mJ K^-1, ln b_homogeneous = -11.57 mol cm^-2 s^-1
E_{b-defect assisted} = 8.44 × 10^-16 mJ K^-1, ln b_{defect assisted} = 83.34 mol cm^-2 s^-1
ω = 1.1 × 10^-28 m³, h = 5.25 × 10^-10 m
T°C	¹ K _eq	α_homogenous mJ m^-2	² y-intercept _homogeneous	α_{defect assited} mJ m^-2	² y-intercept _{defect-assisted}
125	10^14.48	275.9	-25.5	39.4	-36.9
150	10^13.27	164.6	-25.5	53.0	-30.6
160	10^12.82	123.7	-25.5	58	-28.3
175	10^12.19	³65.8	³-25.5	³65.1	³-25.0

¹Solubility constants K_eq are taken from Supcrit92 (Johnson et al., 1992).
²Calculated from: y-intercept_T,i = ln K_T,eq + ln b_i - E_{b T,i}/kT
³Values for 175°C were extrapolated based on temperature dependence of best fit values at 125, 150, and 160°C.

ISSN: 1467-4866