Pressure-induced structural phase transitions in natural kaolinite investigated by Raman spectroscopy and electrical conductivity
Abstract: We investigated the structural, vibrational, and electrical transport properties of natural kaolinite and its high-pressure polymorphs by Raman scattering and electrical conductivity measurements at 293–673 K and up to 10.0 GPa using diamond-anvil cell. Upon compression, kaolinite underwent two structural transitions from kaolinite I to kaolinite II to kaolinite III phases at pressures of 2.9 and 6.5 GPa, respectively, which was disclosed by the inflection point in the pressure-dependent Raman shifts and electrical conductivity. Upon decompression, kaolinite III directly transformed to kaolinite I at 0.8 GPa without the appearance of kaolinite II. Additionally, the influence of temperature on the structural transformation of natural kaolinite was explored by high-temperature and high-pressure electrical conductivity measurements and negative temperature-dependent transition pressure correlations were obtained. A phase diagram of natural kaolinite was established for the first time and the kaolinite I-kaolinite II and kaolinite II-kaolinite III phase transition boundaries were determined: P (GPa) = 4.298–0.00462 T (K) and P (GPa) = 8.895–0.00799 T (K), respectively. Furthermore, our acquired phase diagram can be applied to understand the stability field of high-pressure polymorphs of kaolinite in the Earth’s interior and may provide a phase transition model for other kaolin-group minerals.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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Pressure-induced structural phase transitions in natural kaolinite investigated by Raman spectroscopy and electrical conductivity ; volume:107 ; number:3 ; year:2022 ; pages:385-394 ; extent:10
American mineralogist ; 107, Heft 3 (2022), 385-394 (gesamt 10)
- Creator
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Hong, Meiling
Dai, Lidong
Hu, Haiying
Zhang, Xinyu
- DOI
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10.2138/am-2021-7863
- URN
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urn:nbn:de:101:1-2404211536553.912572743714
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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14.08.2025, 10:53 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Hong, Meiling
- Dai, Lidong
- Hu, Haiying
- Zhang, Xinyu
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