Dielectric materials were first studied by Faraday, who gave the name to these class of materials. It is amazing when the electrical resistivity of materials are considered, it would be from literally zero (for superconductors) to highly insulating materials like SiO2 or polytetrafluoroethylene, which have higher than EΩ (E is exa meaning 1018). If anyone has a confusion to determine what materials should be considered as dielectrics, I have one comment `all materials are dielectrics', however it would depend on the time (or frequency) scale of interest; even metals would be expressed with dielectric function at optical frequencies. Well if you are interested in materials for electrical insulation applications, then we should be interested in dielectrics with low dielectric losses and high electrical resistivities. Most of the electrical insulation applications are concerned with power frequency and direct current conditions, which are either 50 or 60Hz depending on the geography for the former, and zero frequency for the latter.
Some of the technological aspects of dielectric materials were discussed in the literature with respect to electronics
Some of the technological aspects of dielectric materials were discussed in the literature with respect to electronics
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