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We present results of our study of polarized Raman scattering and infraredreflectivity of rhombohedral ceramic La_1-ySr_yMn_1-xM_xO_3 manganites in thetemperature range between 77 and 320K. In our samples, a part of the Mn atomsis substituted by M = Cr, Co, Cu, Zn, Sc, or Ga with x in the range 0 -- 0.1.The hole concentration was kept at the optimal value of about 32% by tuning theSr content y. We have monitored the distortions of the oxygen sublattice by thepresence of broad bands in the Raman spectra, the increase of d.c. resistivityextracted from the infrared reflectivity, and the change of the criticaltemperature of the ferromagnetic transition. Our results support the idea, thatthese properties are mainly determined by the radius of the substituent ion,its electronic and magnetic structure playing only a minor role. Furthermore,the Raman spectra exhibit an additional A_g-like high frequency mode attributedto the local breathing vibration of oxygens surrounding the substituent ion.Its frequency and intensity strongly depend on the type of the substituent. Inthe Co-substituted sample, the mode anomalously softens when going from 300 to77K. The frequency of the bulk A_{1g} mode depends linearly on the angle of therhombohedral distortion.Comment: 11 pages, 11 Figures, best-fit values table added, a discussion adde

physical review. b, condensed matter and materials physics

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Raman and infrared studies ofLa1−ySryMn1−xM