Title :
X-ray radiation-induced conductivity in both ferro and paraelectric phase of P(VDF/TrFE) copolymers
Author :
Da Cunha, Helder N. ; Faria, Roberto M.
Author_Institution :
Inst. de Fisica, Sao Carlos Univ., Brazil
Abstract :
An investigation of the radiation-induced conductivity (RIC) in P(VDF/TrFE) copolymer of 70:30 molar ratio, due to X-ray irradiation, was performed at different temperatures. At room temperature (ferroelectric phase) the RIC presented a quasi-linear dependence on time even after three hours of continuous irradiation, for dose rates of approximately 10 Gy/s. At 120°C, in the paraelectric phase, the RIC was linear in the first minutes of irradiation, leached a maximum at about 10 minutes and then decreased slowly. The results were explained in terms of a dispersive transport mechanism, and the Arkhipov model was used to fit the experimental data
Keywords :
X-ray effects; electrets; electrical conductivity; ferroelectric materials; ferroelectric transitions; organic insulating materials; photoconductivity; polymer blends; 10 min; 120 C; Arkhipov model; P(VDF/TrFE) copolymers; X-ray radiation-induced conductivity; dispersive transport mechanism; dose rates; ferroelectric phase; paraelectric phase; quasi-linear dependence; radiation-induced conductivity; Conducting materials; Conductivity; Delay; Dispersion; Electrodes; Ionizing radiation; Mechanical factors; Phase measurement; Polymers; Temperature dependence;
Conference_Titel :
Electrets, 1994. (ISE 8), 8th International Symposium on
Conference_Location :
Paris
Print_ISBN :
0-7803-1940-0
DOI :
10.1109/ISE.1994.514851
