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The c-axis polarized phonon spectra of single crystals of YBCO_{6+x} havebeen measured for the doping range x=0.5 -> 0.95, between 10 K and 300 K. Thelow background electronic conductivity, determined by Kramers-Kronig analysisof the reflectance, leads to a rich phonon structure. With decreased doping thefive normally-active B_{1u} modes broaden and the high-frequency apical oxygenmode splits into two components. We associate the higher of these with thetwo-fold coordinated copper-oxygen sticks. The 155 cm^{-1} low-frequency mode,which involves the apical and chain-oxygens, splits into at least threecomponents with decreasing doping. Some phonon anomalies which occur near T_cin the highly-doped material occur well above T_c in the oxygen-reducedsystems. An unusual broad phonon band develops in the normal state at approx400 cm^{-1}, which becomes more intense at low doping and low temperatures,borrowing oscillator strength from apical and plane oxygen modes resulting in amajor transformation of the phonon spectrum below approx 150 K.Comment: 13 pages with 9 figures and 2 tables; this version is an almost exact  copy of the article as it appeared in CJP and may be used as an electronic  reprin

Optical phonons polarized along the c axis of YBa2Cu3O6+x, for x = 0.5 → 0.95

Optical phonons polarized along the c axis of YBa₂Cu₃O_6+x, for x = 0.5 → 0.95