EFFECT OF IMPURITIES ON GRAIN GROWTH IN SYNTHETIC CALCITE AGGREGATES
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dc.contributor.author | Freund D. | |
dc.contributor.author | Rybacki E. | |
dc.contributor.author | Dresen G. | |
dc.date.accessioned | 2021-03-15T07:09:54Z | |
dc.date.available | 2021-03-15T07:09:54Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=816729 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2001, 28, 10, 737-745 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/26721 | |
dc.description.abstract | We investigated grain growth of calcite aggregates fabricated from crushed natural single crystals with different impurity content. The total trace-element concentration of the starting powders varied from about 170 ppm to more than 930 ppm with Mn as the major component. Samples were produced by hot-isostatic pressing of the different powders at 300 MPa confining pressure at 600 °C for 2 h. The starting material for the anneals was dry and had a uniform microstructure with an average grain size of about 5 μm and a porosity of <2.1%. Three disks with Mn concentrations of 10, 350, and 670 ppm, respectively, were annealed in the same run at a confining pressure of 300 MPa, and temperatures between 700 and 900 °C for up to 20 h. Grain growth was fastest in samples with the highest Mn concentrations. A multivariable fit to the data yields grain-growth exponents of 2.0 ± 0.3 for samples with 10 ppm Mn and 2.3 ± 0.2 for those with 670 ppm Mn. The activation energies for grain growth vary from 99 ± 12 kJ mol-1 147 ± 14 kJ mol-1r the respective calcite compositions. | |
dc.subject | CALCITE AGGREGATES | |
dc.subject | GRAIN GROWTH | |
dc.subject | IMPURITIES | |
dc.title | EFFECT OF IMPURITIES ON GRAIN GROWTH IN SYNTHETIC CALCITE AGGREGATES | |
dc.type | Статья |
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