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Thermo-dielectric analysis

Part 2: Zeolites

Journal of Thermal Analysis and Calorimetry
Authors: R. Roque-Malherbe and A. Montes

By means of thermo-dielectric analysis, some natural and synthetic zeolites were studied (clinoptilolite, mordenite,X, Y andA). The results indicate the existence of two effects, one related to water evolution, reflected in a decrease of dielectric constant; the second peak is related to ionic conduction at high temperature. Both peaks characterize zeolites, in thermo-dielectric analysis.

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Journal of Thermal Analysis and Calorimetry
Authors: R. Gonzales-Santos and R. Roque-Malherbe

Dithionates (CaS2O6·4H2O, SrS2O6·4H2O, BaS2O6·2H2O, MnS2O6·4H2O, MgS2O6·6H2O, CoS2O6·6H2O, NiS2O6·6H2O, ZnS2O6·6H2O and CuS2O6·4H2O) were subjected to thermodielectric analysis. The thermoanalytical curves show low temperature effects from 60 to 350°. These are related with the dehydration and decomposition of the dithionates, which could be fully correlated with the knowledge of the thermal behavior of these compouds obtained with other thermal methods.

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Foundations of thermo-dielectrical analysis

II. Calculation of the dielectric susceptibility of dehydrated homoionic zeolites

Journal of Thermal Analysis and Calorimetry
Authors: R. Roque-Malherbe and M. Hernandez-Velez
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Journal of Thermal Analysis and Calorimetry
Authors: N. Vega, R. Roque-Malherbe, and C. Gonzales
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Foundations of thermo-dielectrical analysis

Part I. Cationic polarization in zeolites

Journal of Thermal Analysis and Calorimetry
Authors: R. Roque-Malherbe and M. Hernandez-Velez

The method of thermodielectrical analysis registers in its thermogram a low temperature effect (50–350°) related with the polarization of water or other sorbed phase and cationic polarization, and a high temperature effect (400–900°) which is fundamentally related with cationic conduction. In the present report with the help of the measurement of the dielectrical permittivity of powders of homoionic zeolites was shown the role of cationic polarization in the determination of the intensity of the first thermal effect registered in thermodielectrical analysis.

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Dielectric differential thermal analysis

IX. The role of guest molecules

Journal of Thermal Analysis and Calorimetry
Authors: R. Roque-Malherbe, C. de las Pozas, and M. Carreras
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A deeper understanding of the role of water in dielectric-differential thermal analysis is presented.

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