Optical transparency range

The compounds K5Nb3OFi8 and Rb5Nb3OFi8 display promising properties for their application in electronics and optics. The compounds can be used as piezoelectric and pyroelectric elements due to sufficient piezo- and pyroelectric coefficients coupled with very low dielectric permittivity. In addition, the materials can successfully be applied in optic and optoelectronic systems due to their wide transparency range. High transparency in the ultraviolet region enables use of the materials as multipliers of laser radiation frequencies up to the second, and even fourth optical harmonic generation. 

Optical transparent in the visible and near IR range. Piezoelectric characteristics... 

The hard carbon produced by this method has a range of different properties from those of plasma produced films (Table V). Note that the maximum band gap achievable with ICBD is 1.2eV at maximum hydrogenation (35 atomic %) while values up to 4eV can be obtained by plasma deposition. These wide band-gap materials are soft and easily scratched though they are more optically transparent. 

Coating formulations (lacquers) are clear, transparent, low-viscosity, solvent-free liquids that are stable with a shelf life of several months and are suitable for optical applications ranging from the ophthalmic to the optical fibre market. As an example of the former, Figure 4.15 shows a plate half coated with a layer of ABRASIL coating material only a few micrometres thick with the scratch traces from steel wool being observed on the uncoated half.18... 

Polycarbonates are used in optics, transparent technical parts, aesthetic applications and protection devices for their transparency, mechanical properties, impact resistance, rigidity, good creep behaviour, fatigue resistance, insulating properties, dimensional stability, low moisture uptake, broad range of service temperatures (-100°C up to -i-135°C),food contact and sterilization possibilities for suitable grades. 

While it has been known for years that water droplets in the micrometer size range can supercool down to -40°C (Fletcher, 1962 Rasmusse et al, 1973), very few attempts have been carried out on water droplets in the nanometer range, which are obtained with micromicellar solutions of water in a number of nonpolar solvents of very low freezing point. Such solutions are homogeneous and of low viscosity they can remain perfectly colorless and therefore optically transparent at very low temperature (s-60 C) and can be used as media to investigate enzyme-catalyzed reactions. 

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