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Comparative study of single-crystal dehydration of LiCOOH.H2O and Li2SO4·H2O |
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| Authors: | Yu A Gaponov B I Kidyarov N A Kirdyashkina N Z Lyakhov V B Okhotnikov |
| Institution: | (1) Institute of Solid-State Chemistry, Siberian Branch of the U. S. S. R. Academy of Sciences, Derzhavina 18, 630091 Novosibirsk, U. S. S. R. |
| Abstract: | The kinetics of isothermal dehydration of two crystal hydrates with equivalent water molecule sublattices (LiCOOH.H2O and LiSO4.H2O) was investigated in vacuum with a quartz crystal microbalance, and the dynamics of structural reorganization of the substances was studied by the synchrotron radiation method. Differences were found both in the nucleation stage and in the stage of reaction interface advance. The results indicate that the kinetic behaviour of isothermal decomposition of solids is determined by the structural reorganization of a metastable intermediate.Zusammenfassung Die Kinetik der isothermen Entwässerung zweier Kristallhydrate mit gleichartigen Teilgittern der Wassermoleküle wurde untersucht mittels isothermer TG im Vakuum und Synchrotron-Röntgenbeugung. Unterschiede zwischen beiden Materialien werden sowohl in der Keimbildungswie- wei in der Ausbreitungsphase gefunden. Die Ergebnisse zeigen, dass die Kinetik der isothermen Zersetzung fester Stoffe durch die strukturelle Reorganisation eines metastabilen Zwischenprodukts bestimmt wird.
The authors would like to thank N. Kosova for experimental assistance. |
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