Accession Number : ADA632380


Title :   Optimal Super Dielectric Material


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Jenkins, Natalie-Rose L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a632380.pdf


Report Date : Sep 2015


Pagination or Media Count : 73


Abstract : The results of this study establish that powder-based super dielectric materials (SDM) are a large family of porous electrically insulating materials filled to the point of incipient wetness (paste consistency) with liquids containing dissolved ions. This work studied the dielectric behavior at low frequency of four different high surface area, porous, refractory oxides: two alumina materials, one silica, and one fumed silica, filled with aqueous solutions containing one of two salts (NaCl or NH4Cl). All were found to have dielectric constants greater than 10 to the 9th power. This strongly supports the fundamental hypothesis of SDM: In the presence of an electric field any electrically insulating, porous material containing liquid with dissolved ionic species will form large dipoles, polarized opposite the applied field. Large dipole SDM placed between the electrodes of a parallel plate capacitor will reduce the net field to an unprecedented extent. This family of materials can form materials with dielectric values orders of magnitude greater than any material previously studied (ca. 10000 BaTiO3). Moreover; this study establishes that the identity of the porous insulating media can greatly impact the dielectric constant; 10 to the 9th power alumina; 10 to the 11th power fumed silica. One implication of these results is that SDM can potentially be optimized to create capacitors with unprecedented energy density.


Descriptors :   *DIELECTRIC PROPERTIES , *POROUS MATERIALS , *POWDERS , ALUMINUM OXIDES , CAPACITORS , DIELECTRICS , ELECTRIC FIELDS , ELECTRODES , ENERGY DENSITY , IONS , LOW FREQUENCY , THESES


Subject Categories : Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE