For a grown crystal, which analysis is suitable to find the index for a study about dielectric constant?
To find refractive index of a crystal, three formulae are there:
µ = (Sin i )/(Sin r)
µ = (Real depth)/(Apparent depth)
µ = (Speed of light in medium 1)/(Speed of light in medium 2)
We can find the refractive index by any suitable experimental methods. Any one of the above formulae can be used.
you can use Reflectometry
This technique is based on the reflection of waves at the interface of interest. Waves propagates into a medium (according to the laws of propagation into the medium studied) and when it encounters a discontinuity (impedance break), part of its energy is reflected back to injection point.
if you dont have in formation about method i will sent to you
If the reflectometry were difficult,
alternative method is observing a sample by naked eye (if the sample is big) or optical microscopy (if the sample is small) into various standard refractive index solutions. One of commercial products: http://www.cargille.com/refractivestandards.shtml
If the reflective index of sample and refractive index of medium were the same, the sample is observed as transparent.
It has to be noticed that a lot of crystal has a anisotropicity, i.e., each crystal face of the same crystal can have different reflective index.
Dear Raja,
first of all, two question for you: what about the size of the crystal ? and, secondly, can you cut thin sections (near 30 micron thick) of your crystal?" In these cases a mineralogist or a petrologist can help you to determine the birefringence (for a anisotropic crystal) by means of the Michel-Levy Table and then measure the "mean" refraction index through the Becke line. Tell me, please, some characteristics of your crystal.
Thank you
Dino
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