Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies
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Cajkovski, TDavidović, Milorad P.
Cajkovski, D
Likar-Smiljanic, V
Biljic, R
Mioč, Ubavka B.
Nedić, Zoran
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Complex permittivity of 12-tungstophosphoric acid hexahydrate (H3PW12O40 6H(2)O), 6-WPA has been measured at microwave frequencies (X-band) in the temperature interval from 296 K to 350 K. From 296 K to 328 K 6-WPA displays dipolar relaxation of the Debye type at the frequency f(1)=9.30 GHz which corresponds to the relaxation time tau (1)=1.7x10(11) s. From 328 K to 350 K large changes of epsilon (f) and epsilon (f) take place. Two additional relaxations appear at frequencies f(2)=8.25 GHz and f(3)=10.80 GHz. These additional relaxations could be due to protonic entities that become excited at higher temperatures. An assignation of these relaxations to specific proton entities is proposed.
Keywords:
12-tungstophosphoric acid hexahydrate / dielectric relaxation at microwave frequencies / protonic conductivitySource:
Materials Science Forum, 2000, 352, 251-254Note:
- Trends in Advanced Materials and Processes, 3rd Yugoslov-Materials-Research-Society Conference, Sep 20-24, 1999, Herceg Novi, Yugoslavia
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VinčaTY - JOUR AU - Cajkovski, T AU - Davidović, Milorad P. AU - Cajkovski, D AU - Likar-Smiljanic, V AU - Biljic, R AU - Mioč, Ubavka B. AU - Nedić, Zoran PY - 2000 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6312 AB - Complex permittivity of 12-tungstophosphoric acid hexahydrate (H3PW12O40 6H(2)O), 6-WPA has been measured at microwave frequencies (X-band) in the temperature interval from 296 K to 350 K. From 296 K to 328 K 6-WPA displays dipolar relaxation of the Debye type at the frequency f(1)=9.30 GHz which corresponds to the relaxation time tau (1)=1.7x10(11) s. From 328 K to 350 K large changes of epsilon (f) and epsilon (f) take place. Two additional relaxations appear at frequencies f(2)=8.25 GHz and f(3)=10.80 GHz. These additional relaxations could be due to protonic entities that become excited at higher temperatures. An assignation of these relaxations to specific proton entities is proposed. T2 - Materials Science Forum T1 - Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies VL - 352 SP - 251 EP - 254 UR - https://hdl.handle.net/21.15107/rcub_vinar_6312 ER -
@article{ author = "Cajkovski, T and Davidović, Milorad P. and Cajkovski, D and Likar-Smiljanic, V and Biljic, R and Mioč, Ubavka B. and Nedić, Zoran", year = "2000", abstract = "Complex permittivity of 12-tungstophosphoric acid hexahydrate (H3PW12O40 6H(2)O), 6-WPA has been measured at microwave frequencies (X-band) in the temperature interval from 296 K to 350 K. From 296 K to 328 K 6-WPA displays dipolar relaxation of the Debye type at the frequency f(1)=9.30 GHz which corresponds to the relaxation time tau (1)=1.7x10(11) s. From 328 K to 350 K large changes of epsilon (f) and epsilon (f) take place. Two additional relaxations appear at frequencies f(2)=8.25 GHz and f(3)=10.80 GHz. These additional relaxations could be due to protonic entities that become excited at higher temperatures. An assignation of these relaxations to specific proton entities is proposed.", journal = "Materials Science Forum", title = "Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies", volume = "352", pages = "251-254", url = "https://hdl.handle.net/21.15107/rcub_vinar_6312" }
Cajkovski, T., Davidović, M. P., Cajkovski, D., Likar-Smiljanic, V., Biljic, R., Mioč, U. B.,& Nedić, Z.. (2000). Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies. in Materials Science Forum, 352, 251-254. https://hdl.handle.net/21.15107/rcub_vinar_6312
Cajkovski T, Davidović MP, Cajkovski D, Likar-Smiljanic V, Biljic R, Mioč UB, Nedić Z. Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies. in Materials Science Forum. 2000;352:251-254. https://hdl.handle.net/21.15107/rcub_vinar_6312 .
Cajkovski, T, Davidović, Milorad P., Cajkovski, D, Likar-Smiljanic, V, Biljic, R, Mioč, Ubavka B., Nedić, Zoran, "Temperature dependence of dielectric relaxation in 12-tungstophosphoric acid hexahydrate at microwave frequencies" in Materials Science Forum, 352 (2000):251-254, https://hdl.handle.net/21.15107/rcub_vinar_6312 .