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Our understanding of the behaviour of electrons in glasses, liquids and non-crystalline materials generally is decades behind the detailed theory available for crystals such as silicon and germanium. This article describes the advances made in the past fifteen years. It includes the work of the Leningrad school on amorphous semiconductors, the reason why they cannot usually be doped, the concept of "variable-range" hopping and the Cohen−Fritzsche−Ovshinsky and other models for the conduction band, and the reason why glass can be transparent. A crucial experiment, that of two-dimensional conduction in an inversion layer at a Si/SiO2 interface, is described. Particular emphasis is given to concepts about which there is a disagreement and indeed controversy, such as the "mobility edge", the "minimum metallic conductivity" and the interpretation to be given to the ovonic threshold switch.
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Why is glass an insulator?
Glass has no free electrons to convey current.
What Do not permit electrons to flow through them?
Glass
Why does a glass rod get positively charged when rubbed with rubber?
electrons are transferred from glass to rubber
Electrons do not flow through the molecular structure of glass for this reason glass is classified as?
an insulator
Why is glass transparent?
When the electrons in molecules are unable to absorb the energy of incident photon, the photon continues along its path. This happens in the case of glass, even though glass is not 100 percent transparent, as some of the photon energy is absorbed by the glass electrons.
If glass is covalently bonded are the electrons free to move and how is this related to the electrical conductivity of glass?
No the electrons are not free to move. This means that the electrical conductivity will be relatively low. -jk
What charge do you get if glass is rubbed with silk?
the silk will rub of the electrons on the silk, leaving the glass positively charged
Electrons do not flow through glassglass is classified as?
Glass is an insulator.
What material is most difficult for electrons to flow through?
glass
Which material is it most difficult for electrons to flow through?
glass
Will rubbing a silk cloth on glass cause electrons to move to the cloth?
Yes, rubbing a silk cloth on glass cause electrons to move to the cloth. As a result, glass rod acquires positive charge and silk acquires negative charge.
Is glass insulator or conductor?
Glass is an insulator, as it DOES NOT conduct current. It is a material which has no free electrons available to flow as electrical current. Conductors, like copper or aluminum, have free electrons, or electrons in the outer shells of their atoms that are easily knocked loose. These electrons flow from negative to positive when an electrical potential (voltage) is applied across the material. We call the flow of electrons "current".
