Titanium complexation in hydrothermal systems

Ryzhenko, B. N.; Kovalenko, N. I.; Prisyagina, N. I.

doi:10.1134/s0016702906090047

Cited by 32 publications

(23 citation statements)

References 3 publications

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“…By contrast, the diamond‐anvil cell determinations by Audétat & Keppler (2005) gave consistently lower titanium concentrations and much lower dependence on temperature. A three‐parameter fit to the data at 700–1000°C and 7–20 kbar of Antignano & Manning (2008b) ( n = 8, σ = 0.028, 0.85%) reproduces rutile solubilities determined by fluid extraction at 500°C and 1 kbar (Ryzhenko et al. 2006) and 300°C and 200 bar (Knauss et al.…”

Section: Calibration Of the Modelmentioning

confidence: 69%

“…(1962), Weill & Fyfe (1964), Crerar & Anderson (1971), at isotherms of 25, 100–900°C; (B) solid diamonds: Becker et al. (1983) at 666–700°C; solid circles: Tropper & Manning (2007a) at 700, 800, 900, 1000 and 1100°C; open circles: Walther (1997) at 400, 500 and 600°C; (C) solid diamonds: Fein & Walther (1989) at 400, 500 and 600°C; solid circles: Caciagli & Manning (2003) at 500, 600 and 700°C; (D) solid circles: Antignano & Manning (2008a) at 700, 800 and 900°C; (E) solid circles: Antignano & Manning (2008b) at 800, 900 and 1000°C; open circles: Tropper & Manning (2005) at 1000 and 1100°C; open diamonds: Audétat & Keppler (2005) at 821–1025°C; open triangle: Ryzhenko et al. (2006) at 500°C; (F) solid circles: Tropper & Manning (2007b) at 600, 700, 800, 900 and 1000°C; open diamonds: Strübel (1965) at 200, 300, 400, 500 and 600°C; (G) solid circles: Walther (1986) at 300, 400, 500 and 600°C.…”

Section: Calibration Of the Modelmentioning

confidence: 99%

“…1980; Walther & Orville 1983; Manning 1994); (B) diamonds: Becker et al. (1983) at 5, 10 and 20 kbar; circles: Tropper & Manning (2007a) at 10 and 20 kbar; (C) diamonds: Fein & Walther (1989) at 2 kbar; circles: Caciagli & Manning (2003) at 10 kbar; (D) circles: Antignano & Manning (2008a) at 10, 15 and 20 kbar; (E) diamond: Ryzhenko et al. (2006) at 1 kbar; circles: Antignano & Manning (2008b) at 10 and 20 kbar.…”

Section: Calibration Of the Modelmentioning

confidence: 99%

Section: Calibration Of the Modelmentioning

confidence: 99%

“…Rutile dissolves in pure H 2 O to form neutral hydroxyspecies but is characterized by extremely low solubility. Neglecting an early study of Ayers & Watson (1993), which reported anomalously high solubilities due to mass transport in experiments, the rutile solubility has been experimentally determined by Tropper & Manning (2005), Audétat & Keppler (2005), Ryzhenko et al (2006) and Antignano & Manning (2008b). These studies cover a temperature range of 500-1100°C at pressures of 1-20 kbar, and are complemented by low-temperature investigations of Vasilev et al (1974), Zemniak et al (1993) and Knauss et al (2001) between 100 and 300°C and up to 200 bar.…”

Section: Calibration Of the Modelmentioning

confidence: 99%

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Thermodynamic model for mineral solubility in aqueous fluids: theory, calibration and application to model fluid‐flow systems

Dolejš¹,

Manning²

2010

Geofluids

110

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We present a thermodynamic model for mineral dissolution in aqueous fluids at elevated temperatures and pressures, based on intrinsic thermal properties and variations of volumetric properties of the aqueous solvent. The standard thermodynamic properties of mineral dissolution into aqueous fluid consist of two contributions: one from the energy of transformation from the solid to the hydrated-species state and the other from the compression of solvent molecules during the formation of a hydration shell. The latter contribution has the dimension of the generalized Krichevskii parameter. This approach describes the energetics of solvation more accurately than does the Born electrostatic theory and can be extended beyond the limits of experimental measurements of the dielectric constant of H 2 O. The new model has been calibrated by experimental solubilities of quartz, corundum, rutile, calcite, apatite, fluorite and portlandite in pure H 2 O at temperatures up to 1100°C and pressures up to 20 kbar. All minerals show a steady increase in solubility along constant geothermal gradients or water isochores. By contrast, isobaric solubilities initially increase with rising temperature but then decline above 200-400°C. This retrograde behavior is caused by variations in the isobaric expansivity of the aqueous solvent, which approaches infinity at its critical point. Oxide minerals predominantly dissolve to neutral species; so, their dissolution energetics involve a relatively small contribution from the solvent volumetric properties and their retrograde solubilities are restricted to a relatively narrow window of temperature and pressure near the critical point of water. By contrast, Ca-bearing minerals dissolve to a variety of charged species; so, the energetics of their dissolution reactions involve a comparatively large contribution from volume changes of the aqueous solvent and their isobaric retrograde solubility spans nearly all metamorphic and magmatic conditions. These features correlate with and can be predicted from the standard partial molar volumes of aqueous species.The thermodynamic model can be used over much wider range of settings for terrestrial fluid-rock interaction than has previously been possible. To illustrate, it is integrated with transport theory to show quantitatively that integrated fluid fluxes characteristic of crustal shear zones are capable of precipitating quartz or calcite veins from low-and medium-grade metamorphic conditions, at a geothermal gradient of 20°C km )1 . For subduction zones, modeled by a geotherm of 7°C km )1 , the required fluid fluxes are one to two orders of magnitude lower and predict enhanced efficiency of mass transfer and metasomatic precipitation in comparison with orogenic settings. The new model thus can be applied to shallow hydrothermal, metamorphic, magmatic and subduction fluids, and for retrieval of dependent thermodynamic properties for mass transfer or geodynamic modeling.

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Section: Calibration Of the Modelmentioning

confidence: 69%

Section: Calibration Of the Modelmentioning

confidence: 99%

Section: Calibration Of the Modelmentioning

confidence: 99%

Section: Calibration Of the Modelmentioning

confidence: 99%

Section: Calibration Of the Modelmentioning

confidence: 99%

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Thermodynamic model for mineral solubility in aqueous fluids: theory, calibration and application to model fluid‐flow systems

Dolejš¹,

Manning²

2010

Geofluids

110

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Thermodynamic Model for Mineral Solubility in Aqueous Fluids: Theory, Calibration and Application to Model Fluid‐Flow Systems

Dolejš

Manning

2010

Frontiers in Geofluids

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Surface Passivation toward Highly Stable Mn⁴⁺‐Activated Red‐Emitting Fluoride Phosphors and Enhanced Photostability for White LEDs

Zhou

Song

Deng

et al. 2019

Adv Materials Inter

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Mn4+‐activated red‐emitting fluoride phosphors are indispensable candidates for white light emitting diodes (WLEDs) with enhanced color rendition, however, their intrinsic hydrolysis characteristics seriously restricted the durability applications. Here, a facile and general postsynthetic hydrogen peroxide (H2O2) surface passivation strategy is proposed to treat the K2XF6:Mn4+ (KXF, X = Ti, Si, Ge) phosphors, in which a Mn4+‐rare surface protective layer appears and further covers the corresponding particles. The environment moisture can be effectively isolated by the Mn4+‐rare surface passivation layer with low solubility, which will be sacrificed to protect the phosphor particles even if under extreme hydrolysis conditions. The relative external quantum efficiency of the optimized phosphors still maintains over 96% after the passivation treatment, and the relative luminous intensity still remain 97% even when soaked in water after 12 h. The correlated color temperature of high‐power WLEDs fabricated by the passivated phosphors has no remarkable change during aging process (100 days) in the high temperature (85 °C) and high humidity atmosphere (85%). It is expected that such a surface‐redox strategy can be expanded to other doped materials systems, and also opening a new perspective for the development of luminescence materials with enhanced surface stability and device duration.

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Titanium complexation in hydrothermal systems

Cited by 32 publications

References 3 publications

Thermodynamic model for mineral solubility in aqueous fluids: theory, calibration and application to model fluid‐flow systems

Thermodynamic model for mineral solubility in aqueous fluids: theory, calibration and application to model fluid‐flow systems

Thermodynamic Model for Mineral Solubility in Aqueous Fluids: Theory, Calibration and Application to Model Fluid‐Flow Systems

Surface Passivation toward Highly Stable Mn⁴⁺‐Activated Red‐Emitting Fluoride Phosphors and Enhanced Photostability for White LEDs

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Titanium complexation in hydrothermal systems

Cited by 32 publications

References 3 publications

Thermodynamic model for mineral solubility in aqueous fluids: theory, calibration and application to model fluid‐flow systems

Thermodynamic model for mineral solubility in aqueous fluids: theory, calibration and application to model fluid‐flow systems

Thermodynamic Model for Mineral Solubility in Aqueous Fluids: Theory, Calibration and Application to Model Fluid‐Flow Systems

Surface Passivation toward Highly Stable Mn4+‐Activated Red‐Emitting Fluoride Phosphors and Enhanced Photostability for White LEDs

Contact Info

Product

Resources

About

Surface Passivation toward Highly Stable Mn⁴⁺‐Activated Red‐Emitting Fluoride Phosphors and Enhanced Photostability for White LEDs