Zobrazeno 1 - 10
of 173
pro vyhledávání: '"J. Grammatikakis"'
Publikováno v:
Journal of Applied Geophysics. 102:77-80
The pressure and temperature evolution of an intense dielectric relaxation mechanism in as-received and wetted limestone (from Ioannina region (Greece)) are studied experimentally through complex impedance spectroscopy. The relaxation time decreases
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::581e63678f4b2bf27b9fce01501c7735
https://doi.org/10.1016/j.jappgeo.2013.12.013
https://doi.org/10.1016/j.jappgeo.2013.12.013
Publikováno v:
Solid State Ionics. :1-4
The dielectric relaxation of water-filled granular dielectrics under hydrostatic compression is investigated in the frequency domain. The activation volume and activation enthalpy governing a dominant relaxation mechanism of sandstone partially satur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a33912a4880f00daa78f5cf17067310
https://doi.org/10.1016/j.ssi.2011.12.011
https://doi.org/10.1016/j.ssi.2011.12.011
Publikováno v:
Synthetic Metals. 161:1259-1263
The modification of the ac conductivity and the complex permittivity of conducting polypyrrole was monitored throughout a two years thermal aging at 343K. Reduction of the cross-over frequency is correlated with the degradation of dc-conductivity, wh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::71dbdf35172953850a03bc845b33c2b7
https://doi.org/10.1016/j.synthmet.2011.04.020
https://doi.org/10.1016/j.synthmet.2011.04.020
Autor:
Evangelos Vitoratos, J. Grammatikakis, Anthony N. Papathanassiou, E. Dalas, S. Sakkopoulos, I. Sakellis
Publikováno v:
Synthetic Metals. 150:145-151
The effect of thermal aging of 10–90 wt% zeolite-conducting polypyrrole composite on its dielectric properties is studied in the frequency range 10 −2 to 2 × 10 6 Hz from room temperature to liquid nitrogen temperature. A dielectric relaxation m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a56e8e85edef0a7714380ea13eed2a1
https://doi.org/10.1016/j.synthmet.2005.01.021
https://doi.org/10.1016/j.synthmet.2005.01.021
Autor:
S. Sakkopoulos, I. Sakellis, J. Grammatikakis, Evangelos Vitoratos, Anthony N. Papathanassiou, Evangelos Dalas
Publikováno v:
Journal of Applied Physics. 96:3883-3888
The dielectric properties of polypyrrole-zeolite composites up to 50%w∕w zeolite are studied in the frequency range from 10−2to2×106Hz from room temperature to liquid nitrogen temperature. The complex permittivity formalism reveals a temperature
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c94ebddb07f15f98f264b384fe582756
https://doi.org/10.1063/1.1788846
https://doi.org/10.1063/1.1788846
Autor:
J. Grammatikakis, Anthony N. Papathanassiou, S. Sakkopoulos, I. Sakellis, Evangelos Vitoratos, Evangelos Dalas
Publikováno v:
Synthetic Metals. 142:81-84
The low frequency (10 −2 to 10 6 Hz) a.c. conductivity of fresh and thermally aged polypyrrole–polyaniline blends of various compositions was studied at room temperature. The cross-over frequency that separates the d.c. regime from the dispersive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69c29e87735965587f07ae484bf5074a
https://doi.org/10.1016/j.synthmet.2003.07.013
https://doi.org/10.1016/j.synthmet.2003.07.013
Autor:
Anthony N. Papathanassiou, I. Sakellis, Evangelos Vitoratos, S. Sakkopoulos, J. Grammatikakis, Evangelos Dalas
Publikováno v:
Solid State Communications. 125:95-98
A dielectric relaxation mechanism, which is attributed to the localized motion of trapped polarons, has been recorded in conducting polyaniline by employing the thermally stimulated depolarization current technique. The signal was analyzed within the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b2b118aaf16603da2a3a27078532eae
https://doi.org/10.1016/s0038-1098(02)00707-x
https://doi.org/10.1016/s0038-1098(02)00707-x
Autor:
Evangelos Dalas, J. Grammatikakis, S. Sakkopoulos, Anthony N. Papathanassiou, Evangelos Vitoratos
Publikováno v:
Journal of Physics and Chemistry of Solids. 63:1771-1778
The charge trapping centers in fresh and thermally aged conductive polyaniline–polypyrrole copolymers (starting from pure polyaniline and ending in pure polypyrrole by steps of 10 wt%) were studied by thermally stimulated depolarization current (TS
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::57d6bd0a349628cd11c10208bc342a4b
https://doi.org/10.1016/s0022-3697(01)00264-5
https://doi.org/10.1016/s0022-3697(01)00264-5
Autor:
Anthony N. Papathanassiou, J. Grammatikakis, Evangelos Vitoratos, Evangelos Dalas, S. Sakkopoulos
Publikováno v:
Journal of Materials Science. 37:2865-2869
The thermal aging of conducting polypyrrole/polyaniline (PPy/PA) blends heated at 70°C for up to about 600 hours was studied by d.c. conductivity measurements and by thermally stimulated depolarization current (TSDC) spectroscopy in the temperature
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::588106b1cb707c1245979db7d358de71
https://doi.org/10.1023/a:1016079822107
https://doi.org/10.1023/a:1016079822107
Publikováno v:
Journal of Physics: Condensed Matter. 13:5251-5259
The piezostimulated depolarization currents technique was applied to the study of the relaxation mechanisms in LiF crystals doped with Be2+ impurities. By using different methods for the analysis of the experimental data, the migration volume vm of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b054e4d8de14f2bab3df66334eb52be
https://doi.org/10.1088/0953-8984/13/22/318
https://doi.org/10.1088/0953-8984/13/22/318