Thermodynamic stability and kinetics of perovskite dissolution

Nesbitt, H.W.; Bancroft, G.M.; Fyfe, W. S.; Karkhanis, Suresh N.; Nishijima, Akio; Shin, Shigemitsu

doi:10.1038/289358a0

Cited by 124 publications

(52 citation statements)

References 7 publications

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“…As BaTiO 3 is thermodynamically unstable in acidic condition, Ba 2þ is leached out from the surface, as a result of which the Ba/Ti ratio of the particle surface may change [13,21].…”

Section: The Chemistry Of Batio 3 In Aqueous Solutionmentioning

confidence: 99%

“…But, due to economic and environmental consideration, aqueous medium is preferable instead of organic solvent. However, it has been reported [13,14] that most of the perovskites are not thermodynamically stable in aqueous solution, especially at acidic pH. Ba 2þ ions are leached out from the surface of BaTiO 3 powders depending on the pH of the solution creating a rich surface layer of titanium dioxide [13,15], thus changing the properties of BaTiO3.…”

Section: Introductionmentioning

confidence: 99%

“…However, it has been reported [13,14] that most of the perovskites are not thermodynamically stable in aqueous solution, especially at acidic pH. Ba 2þ ions are leached out from the surface of BaTiO 3 powders depending on the pH of the solution creating a rich surface layer of titanium dioxide [13,15], thus changing the properties of BaTiO3. The leached Ba 2þ ions will redeposit onto the BaTiO 3 surface upon drying, which may lead to deviation in Ba/Ti ratio, inhomogeneous microstructure, exaggerated grain growth and dielectric properties of the final product [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Dissolution properties of BaTiO₃nanoparticles in aqueous suspensions

Tripathy

Raichur

2011

Journal of Experimental Nanoscience

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Dissolution of barium ion from aqueous suspensions of commercial nano-sized barium titanate powders (BaTiO 3 ) has been studied at various pH values, solids loading, different time intervals and different electrolyte concentrations. Zeta potential measurements at various pH values and Fourier transform infrared spectroscopy study were also carried out to know the surface behaviour. Dissolution of Ba 2þ depends on the suspension pH and stirring time period. The iso-electric points were found at 3.4 and 12.2 for as-received BaTiO 3 powder and 2.3 for the leached BaTiO 3 . The Ba 2þ -leached BaTiO 3 suspension retards further leaching of Ba 2þ ions at different pH values, which favours the achievement of stable suspension.

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“…As BaTiO 3 is thermodynamically unstable in acidic condition, Ba 2þ is leached out from the surface, as a result of which the Ba/Ti ratio of the particle surface may change [13,21].…”

Section: The Chemistry Of Batio 3 In Aqueous Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dissolution properties of BaTiO₃nanoparticles in aqueous suspensions

Tripathy

Raichur

2011

Journal of Experimental Nanoscience

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“…In the presence of silica or C02, perovskite (CaTiOJ is unstable in a low temperature environment [15], because of the following reactions: and, therefore, will keep both pyrochlore and perovskite minerals thermodynamically stable in the repository.…”

Section: Thermodynamic Stability Of Pyrochlore Minerals In Deep Geolomentioning

confidence: 99%

Thermodynamic Stability of Actinide Pyrochlore Minerals in Deep Geologic Repository Environments

Wang

1999

MRS Online Proceedings Library

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Crystalline phases of pyrochlore (e.g., CaPuTizOT, CaUTi207) have been proposed as a durable ceramic waste form for disposal of high level radioactive wastes including surplus weapons-usable plutonium. In this paper, we use a linear free energy relationship to predict the Gibbs free energies of formation of pyrochlore phases (CaMTizOT). The Pu-pyrochlore phase is predicted to be stable with respect to PU02, CaTiO~, and Ti02 at room temperatures. Pu-pyrochlore is expected to be stable in a geologic repository where silica and carbonate components are absent or limited. We suggest that a repository in a salt formation be an ideal environment for disposal of high level, pyrochlore-based ceramic wastes. In such environment, adding CaO as a backfill will make pyrochlore minerals thermodynamically stable and therefore effectively prevent actinide release from these mineral phases.

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“…19 Table 2 Carbon coverage 20 Table 3 Bindiag energies and peak splittiags for species occurring in CATIO 3 Evolution of 0 Is envelope as function of ion etcning dose for R8, shoving charge snifted peak due to either the presence of precipitated titanate on attacked surface, or a precipitated silicaceous layer. …”

Section: Table Imentioning

confidence: 99%