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Identification of point defects in hydrothermally grown KTiOPO4

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4 Author(s)
Scripsick, M.P. ; Physics Department, West Virginia University, Morgantown, West Virginia 26506 ; Edwards, G.J. ; Halliburton, L.E. ; Belt, R.F.

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Electron paramagnetic resonance has been used to investigate radiation‐induced point defects in hydrothermally grown single crystals of potassium titanyl phosphate ( KTiOPO4 or KTP). The crystals were irradiated at 77 K with 60–kV x rays. A trapped‐hole center, a Ti3+ center, and a Pt3+ center were observed between 10 and 30 K after the initial 77‐K irradiation. These defects become thermally unstable near 160 K. The trapped hole is localized on an oxygen ion adjacent to a potassium vacancy and has resolved hyperfine interactions with three phosphorus nuclei. The Ti3+ ion is the intrinsic self‐trapped electron center in KTP and has weak hyperfine interactions with four phosphorus nuclei.

Published in:

Journal of Applied Physics  (Volume:70 ,  Issue: 6 )