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Vermiculite

About: Vermiculite is a research topic. Over the lifetime, 2320 publications have been published within this topic receiving 37142 citations.


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Journal ArticleDOI
TL;DR: In this article, the pore volumes, size distributions, average radii and surface fractal dimensions were calculated from mercury intrusion curves, ranging from c.a. 0.01 to 10μm in radius.

9 citations

Journal ArticleDOI
TL;DR: In this article, a metamorphic vermiculite-like phase was identified in Ca-rich ancient ceramic sherds from excavations in NW Peloponnese, Greece.
Abstract: A \`metamorphic vermiculite'-like phase was identified in Ca-rich ancient ceramic sherds from excavations in NW Peloponnese, Greece. Archaeometric investigations have shown that the raw materials used in the production of ancient ceramics were derived from local Plio-Pleistocene sediments. Analysis by X-ray diffraction and scanning electron microscopy-energy dispersive spectroscopy showed that \`metamorphic vermiculite' is a common constituent phase of these sediments occurring in three texturally different types: as interstratified white mica-chlorite and chlorite-vermiculite, and white mica-(white mica-chlorite) stacks. In an attempt to elucidate the thermal transformation of \`metamorphic vermiculite' present in the calcareous raw materials, we produced experimental ceramics made from these local raw materials and fired them at 700, 750, 850, 950 and 1050°C in a static air furnace. The mixed-layered chlorite-vermiculite was transformed completely at ∼800°C contributing to the formation of new high- T minerals. The two other types of \`metamorphic vermiculite' retain their original lath-like shape up to 1050°C and only a few crystals show that they have undergone complete transformation at this temperature. In the latter crystals, numerous nanocrystals were formed sub-parallel to the former cleavages of \`metamorphic vermiculite' pseudomorphs, suggesting their contribution to the nucleation of high- T minerals (i.e. ferrian aluminian diopside, spinel, Fe oxides) by reactions with the available CaO. It is suggested that the firing conditions (i.e. maximum reaction temperature of 1050°C, reaction time of 1 h, oxygen atmosphere) which promote disequilibrium reactions, and the greater contribution of the white mica constituent against chlorite in some of the initial structures of \`metamorphic vermiculite' may be responsible for the delay of its thermal decomposition at 1050°C.

9 citations

Journal ArticleDOI
TL;DR: In this article, the mineralogy of the clay and coarse silt fractions of 31 Maritime soils with a few exceptions showed close similarities and the predominant clay mineral was illite and it was associated with chlorite, vermiculite and kaolinite.
Abstract: The mineralogy of the clay and coarse silt fractions of 31 Maritime soils with a few exceptions showed close similarities. The predominant clay mineral was illite and it was associated with chlorite, vermiculite and kaolinite. Significant amounts of montmorillonite occurred in only one soil, the Truro. Vermiculite appeared in all the surface soil clays, and mixed-layer assemblages of various 2:1 layer silicates, including chloritic components, were present in many of the clays.The silt fractions of the Nova Scotia and New Brunswick soils contained substantial amounts of albite-type plagioclase feldspar in addition to quartz, chlorite and mica. The Prince Edward Island soils, except the Queens, differed in that they contained small amounts of a variety of feldspars.

9 citations

Journal ArticleDOI
TL;DR: In this paper, liquid acrylonitrile was intercalated in an alkylammonium vermiculite, polymerized in situ and carboreduced under a nitrogen flow.
Abstract: In the preparation of Si–M–O–N ceramics (M = Al, Mg), liquid acrylonitrile was intercalated in an alkylammonium vermiculite, polymerized in situ and carboreduced under a nitrogen flow. Magnesium silicon nitride, β-silicon nitride and β-sialon with fibre morphology were produced at 1400 °C.

9 citations

Journal ArticleDOI
TL;DR: For understanding and predicting the Cs behavior in soils and groundwater, Cs adsorption properties of illite and vermiculite were investigated under various pH conditions and Cs concentrations as mentioned in this paper .

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202395
2022223
202163
202068
2019104
2018101