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      Thermostimulated crystal structure transformation of the polymineral clay submicron particles

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          Abstract

          Abstract Changes in the structure of phyllosilicate microparticles of submicron fractions of polymineral clay with an average size of 290 nm, as well as changes in the positions of impurity ions of transition metals in the crystal lattice, were studied by X-ray diffraction analysis, Fourier transform infrared spectroscopy, and high-resolution electron paramagnetic resonance spectroscopy. The main composition of microparticles included clinochlore, montmorillonite, calcite, and quartz. Structural transformations were stimulated by heating the samples to 1200 K at a rate of 10 K/min. A decrease in the number of crystal structures of microparticles was recorded due to the amorphization of montmorillonite, the decomposition of calcite, and the formation of sillimanite. Structural rearrangements of crystal cells containing impurity paramagnetic ions Fe3+ and Mn2+ in submicron particles of clinochlore and montmorillonite, accompanied by displacements and changes in the chemical bonds of these ions, were recorded by the ion-electron paramagnetic resonance method. It is shown that when microparticles were heated to 1200 K, the impurity paramagnetic ions of transition metals did not go beyond their crystal cells.

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          Most cited references36

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          Applied clay mineralogy

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            Nanosyst. Phys. Chem. Math.

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              Meas. Tech.

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                Author and article information

                Journal
                ce
                Cerâmica
                Cerâmica
                Associação Brasileira de Cerâmica (São Paulo, SP, Brazil )
                0366-6913
                1678-4553
                December 2022
                : 68
                : 388
                : 441-449
                Affiliations
                [1] Orenburg orgnameOrenburg State University Russian Federation
                [2] Moscow orgnameLLC “Lumex-Centrum” Russian Federation
                Article
                S0366-69132022000400441 S0366-6913(22)06838800441
                10.1590/0366-69132022683883346
                5d9ee37a-331f-4948-8907-d69bb974c2e5

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 19 April 2022
                : 18 August 2022
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 36, Pages: 9
                Product

                SciELO Brazil

                Categories
                Articles

                phyllosilicate particles,structure,paramagnetic ions,spin labels

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