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Study of flexoelectric effect in VDF-based polymers and design of novel organic ferroelectrics
In the first part of the work the strain gradient induced electromechanical coupling known as Flexoelectricity is investigated in vinylidene fluoride (VDF) based polymers. An experimental procedure is proposed and applied to distinguish the piezoelectric contributions from flexoelectric ones in the ferroelectric materials. The magnitudes of flexoelectric coupling coefficient has been measured in the ferroelectric, paraelectric and relaxor states. A comprehensive study of the temperature dependence of flexoelectric effect has also been carried out which shows scaling of the effect with the dielectric constant for very narrow temperature range. The second part delves into new organic ferroelectric systems of diisopropylammonium (DIPAX) salts. Organic systems have advantages over their inorganic counterparts like being lightweight, ecofriendly, easy processing condition and integration in flexible electronics. The synthesis, thermal, electrical and structural properties of bulk crystals are discussed. To be integrated into future devices two approaches for thin film fabrication has been discussed and performed.
Nanoscience|Theoretical physics|Materials science
Poddar, Shashi, "Study of flexoelectric effect in VDF-based polymers and design of novel organic ferroelectrics" (2014). ETD collection for University of Nebraska - Lincoln. AAI3666986.