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Master's Dissertation
DOI
10.11606/D.54.1987.tde-14102009-113933
Document
Author
Full name
Alfredo Jorge
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1987
Supervisor
Title in Portuguese
Medidas de correntes termo-estimuladas e isotermas no ar em filmes de polivinilideno de fluor (PVF2).
Keywords in Portuguese
Correntes termoestimuladas
Filmes
PVF2
Abstract in Portuguese
Um elenco bastante diverso de medidas experimentais isotermas e termicamente estimuladas, com o intuito de estudar efeitos em processos de polarização em filmes de PVF2 foi realizado. A análise dos resultados conduziu a levantar as seguintes hipóteses. Nas amostras Fase Alfa, os processos de polarização existentes em medidas de TSC no ar, estão ligados às orientações dipolares no interior do material; enquanto que para as amostras na Fase Beta, esses processos estão ligados a cargas espaciais que não "abandonam" o material. No segundo caso ajustou-se aos resultados experimentais, um modelo de cinética de primeira ordem, obtendo vários parâmetros elétricos importantes desse material.
Title in English
Measurements of termoestimulated currents and isotherms in air and in films of polyvinylidene fluoride (PVF2)
Keywords in English
Films
PVF2
Termoestimulated current
Abstract in English
A great number of TSC and isotermal decays were carried out in ambient air, aimed to investigate the polarization processes in thin PVF2 foils. The analysis of the results seems to indicate the following: For Alfa-samples, the polarization processes is connected with dipole orientation in the bulk of the material, while, for Betha-samples, these processes are partially due to motion of carriers inside the material. For this case a fitting assuming a first order kinectic process was successful, allowing to derive several parameters.
 
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AlfredoJorgeM.pdf (2.95 Mbytes)
Publishing Date
2009-12-08
 
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