Alkali-free glass as a high energy density dielectric material |
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| Authors: | Nicholas J. Smith Badri Rangarajan Carlo G. Pantano |
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| Affiliation: | a Department of Material Science and Engineering, Materials Research Institute, The Pennsylvania State University, 101 Steidle Building, University Park, PA 16802, USA
b Department of Engineering Science and Mechanics, Materials Research Institute, The Pennsylvania State University, 212 Earth-Engineering Sciences Building, University Park, PA 16802, USA |
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| Abstract: | One of the greatest challenges in the development of new high energy density materials is to increase dielectric permittivity while maintaining high breakdown strength. The dielectric breakdown behavior of an alkali-free barium boroaluminosilicate glass is shown to have remarkably high DC dielectric breakdown strength (12 MV/cm) and reasonably high permittivity (~ 6), equating to energy densities in excess of 35 J/cm3. This behavior is attributed to highly polarizable Ba ions enhancing the real part of complex permittivity, the low loss due to the alkali-free composition, and the substantially defect-free quality of the glass and its surfaces. To our knowledge, this is the highest breakdown strength reported for a bulk glass, and rivals the breakdown strength more typically observed in pristine thin films of SiO2. These findings indicate that alkali-free multicomponent glasses may be strong candidates for next-generation high energy density storage capacitors for portable or pulsed power applications. |
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| Keywords: | Glass Dielectric Energy density Breakdown |
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