Surface energetics of wurtzite and sphalerite polymorphs of zinc sulfide and implications for their formation in nature
Surface energetics of zinc sulfide nanoparticles determines their structure, properties, and occurrence. Using a combination of experimental techniques, we investigated the thermodynamics of the two polymorphs, sphalerite and wurtzite at bulk and nanoscale to understand their occurrence. Calorimetri...
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| Veröffentlicht in: | Geochimica et cosmochimica acta 2022-11, Vol.340 (C) |
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| container_title | Geochimica et cosmochimica acta |
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| creator | Subramani, Tamilarasan Lilova, Kristina Householder, Megan Yang, Shuhao Lyons, James Navrotsky, Alexandra |
| description | Surface energetics of zinc sulfide nanoparticles determines their structure, properties, and occurrence. Using a combination of experimental techniques, we investigated the thermodynamics of the two polymorphs, sphalerite and wurtzite at bulk and nanoscale to understand their occurrence. Calorimetric measurements confirmed that wurtzite has a lower surface energy than sphalerite, which causes a reversal in phase stability at the nanoscale, with wurtzite energetically stable for particle size below 10 nm. Taking these surface energies into account, a simple model of the thermodynamics of the sphalerite - wurtzite transformation as a function of particle size and temperature can explain the occurrence of the zinc sulfide polymorphs in environments as diverse as ore bodies and planetary atmospheres. |
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Using a combination of experimental techniques, we investigated the thermodynamics of the two polymorphs, sphalerite and wurtzite at bulk and nanoscale to understand their occurrence. Calorimetric measurements confirmed that wurtzite has a lower surface energy than sphalerite, which causes a reversal in phase stability at the nanoscale, with wurtzite energetically stable for particle size below 10 nm. 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Using a combination of experimental techniques, we investigated the thermodynamics of the two polymorphs, sphalerite and wurtzite at bulk and nanoscale to understand their occurrence. Calorimetric measurements confirmed that wurtzite has a lower surface energy than sphalerite, which causes a reversal in phase stability at the nanoscale, with wurtzite energetically stable for particle size below 10 nm. 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| issn | 0016-7037 |
| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Exoplanets atmosphere GEOSCIENCES Nano sphalerite-wurtzite transformation Stability crossover Sulfide ores Surface energy |
| title | Surface energetics of wurtzite and sphalerite polymorphs of zinc sulfide and implications for their formation in nature |
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