What is a good method of analyzing powders for composition?

What is a good method of analyzing powders for composition?
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Answer :

A method known as Fourier transform-infrared (FT-IR) spectroscopy is often used for this purpose. FT-IR  sends light beams of varying wavelength through the sample and the reflected light is analyzed by  spectroscopy to find the absorption of each wavelength. The measured wavelengths are compared with  a reference laser and the sample composition can be calculated. Analect Instruments Inc. specializes in  FT-IR measurement.
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