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Ag ions were implanted into strontium titanate (STO) single crystal with the thickness of 0.5mm at largely different energies. The doses are 0.1 - 5 times 1016 ions/cm2 and the implantation energy was 20keV, 128keV and 3MeV. Optical absorption spectrum in the visible range was measured for the samples heated at up to 1000degC. A small absorption peak was observed at 440 nm for an as-implanted sample...
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