Raman and x-ray spectra of single-crystal Bi-Sb alloys

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Abstract
Raman and x-ray spectra have been recorded for single-crystal Bi-Sb alloys over most of the compositional range. The long-wavelength optical-phonon frequencies of pure Bi and Sb are changed only slightly by alloying. At least one new Raman mode appears in the mixed crystals which cannot be explained by a model of random atom occupancy of lattice sites. X-ray diffractometer studies rule out most, but not all arrangements of long-range order in the alloys. A broadening and splitting of x-ray peaks is observed and is interpreted as indicating macroscopic inhomogeneities either of crystal composition or crystal domain orientation.