Dielectric Glass and Its Applications
Dielectric Glass and Its Applications
Dielectric glass is a material with a high dielectric constant that is often used as a coating on surfaces in optical experiments.dielectric glass It is also frequently found on the surface of semiconductor devices such as edge-emitting laser diodes and photodiodes. The low cost, wide transparency range and good durability of such materials make them very attractive for a variety of applications.
For example, mirrors of this type are often used in the design and construction of atomic-force microscopy (AFM) systems.dielectric glass In addition, they are important components in a variety of optical experiments, such as laser cavity end mirrors and thin-film beamsplitters. Dielectric glass also has a number of other uses, including anti-reflection coatings on nonlinear crystals for nonlinear frequency conversion and Pockels cells, as well as on the surface of crystalline semiconductors to reduce reflection.
Generally, dielectric glass is produced by melting a combination of silica and alumina in a furnace at high temperatures.dielectric glass However, it can also be made by mixing the melted mixture with other materials such as alkali oxides and alkaline earth oxides to alter its properties. These additions are known as network modifiers and are commonly introduced to reduce the glass melting temperature and improve chemical durability.
In this study, the ac conductivity and dielectric relaxation characteristics of soda-lime-silicate (SLS) and sodium borosilicate (D263T) glass have been investigated using electrical impedance spectroscopy (EIS). EIS measurements show that both glasses exhibit translational hopping motion dominated by the motion of Na+ ions. The bulk conduction activation energy is estimated to be comparable between SLS and D263T, suggesting that the same mechanism is responsible for both their ac conductivity and dielectric relaxation behavior.
These results confirm that IDE-enabled broadband dielectric spectroscopy is an effective technique for measuring the kinetically controlled glass transition temperatures of organic aerosols under atmospheric conditions. Using this approach, we have measured the dipole relaxation timescales of five different compounds—glycerol, 1,2,6-hexanetriol, di-n-butyl phthalate, and dioctyl phthalate—with selected cooling and heating rates. The measured results agree well with the available literature data for these compounds.
Traditionally, the glass transition temperature of a compound has been determined by plotting the log(T)-log(pi) relationship of its dielectric relaxation curve as a function of its temperature. This method has the advantage of being able to measure relaxation times at temperatures above or below the liquid state, but it has the disadvantage of being sensitive to changes in temperature, such as those caused by heat transfer within the sample itself. In order to overcome this limitation, we have developed a new approach for determining the glass transition temperature of organic compounds by measuring the real and imaginary parts of their complex impedance at various frequencies. This method, which is based on the application of the Fourier transform to the complex impedance spectrum, is shown to be a powerful tool for estimating the kinetically controlled glass transition temperature of organic aerosols. In particular, it allows the measurement of the kinetically controlled glass transition temperature of glycerol with a cooling rate of 5 K min-1.
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