Abstract
Low-frequency spectra of SD-211 and SD-212 made by the DMOS process are reported they show 1 f β spectra with β = 1 at low frequencies and β = 0.76–0.85 at high frequencies. At dry ice temperature a spectrum 1 f 0.55 appears at high frequencies which may indicate a one-dimensional diffusion noise process. At liquid nitrogen temperature the spectrum is 1 f 1.0 throughout; apparently the spectral components 1 f β with β < 1 have been frozen out. This may indicate that these spectral components are associated with ions or dislocations.
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