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Title: Site selective substitution Pt for Ti in KTiOPO{sub 4}:Ga crystals revealed by electron paramagnetic resonance

Electron Paramagnetic Resonance at low temperatures has been used to characterize potassium titanyl phosphate (KTiOPO{sub 4}) single crystals grown by different techniques. Irradiation with 20 MeV electrons performed at room temperature and liquid nitrogen temperature caused an appearance of electrons and holes. Platinum impurities act as electron traps in KTiOPO{sub 4} creating Pt{sup 3+} centers. Two different Pt{sup 3+} centers were observed, Pt(A) and Pt(D). The Pt(A) centers are dominant in undoped samples, whereas Pt(D)—in Ga-doped KTP crystals. Superhyperfine structure registered for Pt(D) centers was attributed to interactions of platinum electrons with {sup 39}K and two {sup 31}P nuclei in their surroundings. In both Pt(A) and Pt(D) centers, Pt{sup 3+} ions substitute for Ti{sup 4+} ions, but with a preference to one of two electrically distinct crystallographic positions. The site selective substitution can be controlled by the Ga-doping.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)
  2. Idaho Accelerator Center, Idaho State University, Pocatello, Idaho 83209 (United States)
Publication Date:
OSTI Identifier:
22308515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALLOGRAPHY; DOPED MATERIALS; ELECTRON SPIN RESONANCE; ELECTRONS; IMPURITIES; INTERACTIONS; IRRADIATION; MEV RANGE 10-100; MONOCRYSTALS; OXYGEN COMPOUNDS; PHOSPHATES; PHOSPHORUS 31; PLATINUM; POINT DEFECTS; POTASSIUM 39; POTASSIUM COMPOUNDS; TITANIUM COMPOUNDS; TITANIUM IONS; TRAPS