Title :
Ferroelectric studies in stretched and corona charged SAN films
Author :
Hundal, Jasbir S. ; Nath, R.
Author_Institution :
Dept. of Appl. Sci., GZS Coll. of Eng. & Technol., Bathinda, India
Abstract :
Ferroelectric properties in the stretched and corona poled films of poly(styrene-co-acrylonitrile) were investigated. The D-E hysteresis loops were studied in the stretched SAN films (S=2.5X) corona poled at poling field Ep≈45 MV/m and poling temperature Tp =85°C in the temperature range 28 to 115°C. The remanent polarization and coercive field were found to decrease with temperature. A phase transition from ferroelectric to paraelectric is believed to be taking place in the film in the vicinity of its glass transition temperature Tg≈112°C. The dielectric relaxation of the order of 13 has been obtained in these films. The application of Frohlich theory to the thermally stimulated current results for the SAN films poled under identical conditions provides the value of orientational correlation factor g≈1.6 which corroborates the cooperative motion of dipoles in these films and explains its ferroelectric behaviour
Keywords :
corona; dielectric hysteresis; dielectric polarisation; dielectric relaxation; ferroelectric materials; ferroelectric thin films; ferroelectric transitions; glass transition; polymer films; 28 to 115 C; D-E hysteresis loops; Frohlich theory; coercive field; cooperative motion; corona charged SAN films; corona poled films; dielectric relaxation; dipoles; ferroelectric studies; ferroelectric-paraelectric transition; glass transition temperature; orientational correlation factor; phase transition; poling field; poling temperature; poly(styrene-co-acrylonitrile); remanent polarization; stretched SAN films; thermally stimulated current; Corona; Dielectrics; Ferroelectric films; Ferroelectric materials; Glass; Hysteresis; Polarization; Storage area networks; Temperature distribution; Thermal factors;
Conference_Titel :
Electrets, 1999. ISE 10. Proceedings. 10th International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-5025-1
DOI :
10.1109/ISE.1999.832132
