Dielectric properties of dehydrated NaA zeolite, analyses and calculation of dielectric spectra

Literature Information

Publication Date 2001-07-12
DOI 10.1039/B102331B
Impact Factor 3.676
Authors

Tatsuo Ohgushi, Kazushi Ishimaru


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Abstract

Dielectric spectra (ε′, ε″ and tan δ) of dehydrated NaA zeolite were measured in the temperature range 330–510 K and analyzed in detail to determine the characteristic values (εs, ε∞, β and peak frequency) of the dielectric relaxations. Two relaxations caused by Na+ ion as an exchangeable cation were measured in the spectra and the relaxations on the lower and higher frequency sides had activation energies of 60 and 49 kJ mol−1, respectively. By using the optimum characteristic values determined, the spectra of ε′, ε″ and tan δ at each temperature were calculated, and each calculated spectrum was in good agreement with the measured spectrum. The temperature dependences of all characteristic values were determined and hence it was possible to calculate the spectra at various temperatures. The characteristic values were also estimated by plotting the measured data on the Cole–Cole plane and separating the Cole–Cole curve separated into three parts including two circular arcs. The characteristic values estimated by this method were not in agreement with those determined by the former method. The limitations of the latter method are discussed.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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