Using the data in Table 19.1, estimate the dielectric constants for borosilicate glass, periclase (MgO), poly(methyl methacrylate), and polypropylene, and compare these values with those cited in the following table. Briefly explain any discrepancies.
Material | Dielectric Constant (1 MHz) |
Borosilicate glass | 4.65 |
Periclase | 9.65 |
Poly(methyl methacrylate) | 2.76 |
Polypropylene | 2.30 |
Table 19.1 Refractive Indices for Some Transparent Materials
Material | Average Index of Refraction |
Ceramics | |
Silica glass | 1.458 |
Borosilicate (Pyrex) glass | 1.47 |
Soda–lime glass | 1.51 |
Quartz (SiO2) | 1.55 |
Dense optical flint glass | 1.65 |
Spinel (MgAl2O4) | 1.72 |
Periclase (MgO) | 1.74 |
Corundum (Al2O3) | 1.76 |
Polymers | |
Polytetrafluoroethylene | 1.35 |
Poly(methyl methacrylate) | 1.49 |
Polypropylene | 1.49 |
Polyethylene | 1.51 |
Polystyrene | 1.60 |
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