A theoretical analysis of dielectric constant of copolymer of vinylidene fluoride and trifluoroethylene near its ferroelectric transition temperature

1984 ◽  
Vol 57 (1) ◽  
pp. 85-88 ◽  
Author(s):  
Susumu Ikeda ◽  
Yasaku Wada
Keyword(s):  
Dielectric Constant ◽  
Transition Temperature ◽  
Theoretical Analysis ◽  
Vinylidene Fluoride ◽  
Ferroelectric Transition ◽  
Ferroelectric Transition Temperature

Thickness Dependence of Electrical Properties in Poly(vinylidene Fluoride Trifluoroethylene) Copolymer Thin Films

2011 ◽  
Vol 295-297 ◽  
pp. 2049-2056 ◽  
Author(s):  
Li Tian ◽  
Sheng Zhao Yuan ◽  
Jing Lan Sun ◽  
Xiang Jian Meng ◽  
Jian Lu Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Transition Temperature ◽  
Film Thickness ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Interfacial Layers ◽  
Poly Vinylidene Fluoride ◽  
Ac Field ◽  
Ferroelectric Transition Temperature

The effect of the thickness on the dielectric and ferroelectric properties of poly(vinylidene fluoride trifluoroethylene) [P(VDF-TrFE)] copolymer thin films were investigated. The results show that the dielectric constant and tunability increase while the coercive field decreases with increasing film thickness. The film thickness also affects both the reversible and irreversible Raleigh parameters in the ac field dependence of dielectric constant. The observed phenomenon can be explained by the existence of interfacial layers between electrodes and film. No obvious thickness-dependent microstructure and ferroelectric transition temperature was observed.

Sintered compacts of nano and micron-sized BaTiO3: Dramatic influence on the microstructure and dielectric properties

2006 ◽  
Vol 21 (4) ◽  
pp. 816-822 ◽  
Author(s):  
Vishnu Shanker ◽  
Tokeer Ahmad ◽  
Henry Ip ◽  
Ashok K. Ganguli
Keyword(s):  
Differential Scanning Calorimetry ◽  
Dielectric Constant ◽  
Transition Temperature ◽  
Dielectric Properties ◽  
High Dielectric Constant ◽  
Scanning Calorimetry ◽  
Ferroelectric Transition ◽  
Maximum Dielectric Constant ◽  
High Dielectric ◽  
First Time

Sintered compacts of nano-sized and micron-sized BaTiO3 show sharp ferroelectric transition and high dielectric constant at specific compositions. The sintered compacts with 1 wt% nano-BaTiO3 show a maximum dielectric constant of 1680. At the transition temperature (Tc) there are two maxima at 0.5 and 2 wt%. The variation in the dielectric constant at Tc is also reflected in the behavior of the ferroelectric transition as studied by differential scanning calorimetry. This interesting oscillatory variation of the dielectric constant and dielectric loss with increase in the amount of nanoparticles in the sintered compacts is observed for the first time. The variation of the dielectric properties and the ferroelectric transition of the sintered compacts could be related to subtle changes in the microstructure.

The ferroelectric transition temperature as an intrinsic probe for sintered nanocrystalline BaTiO3synthesized under supercritical conditions

2005 ◽  
Vol 16 (6) ◽  
pp. 797-802 ◽  
Author(s):  
Catherine Elissalde ◽  
Helen Reverón ◽  
Cyril Aymonier ◽  
Dominique Michau ◽  
François Cansell ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Supercritical Conditions ◽  
Ferroelectric Transition ◽  
Ferroelectric Transition Temperature
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