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Paramagnetic centers in X‐irradiated KH 2 PO 4 crystals doped with chromium
Author(s) -
Alybakov A. A.,
Abdrazakov A. A.,
Arbotoev O. M.,
Kudabaev K.
Publication year - 1988
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170231035
Subject(s) - electron paramagnetic resonance , paramagnetism , chromium , impurity , irradiation , ion , doping , radical , chemistry , analytical chemistry (journal) , crystal (programming language) , single crystal , crystallography , materials science , nuclear magnetic resonance , physics , optoelectronics , organic chemistry , quantum mechanics , chromatography , computer science , nuclear physics , programming language
EPR spectra of X‐irradiated KDP: CrO 4 2−single crystals are studied both at room and liquid nitrogen temperatures. It is found that X‐irradiation of doped KH 2 PO 4 (KDP) crystals at 77 K creates uncharged H 2 PO 4 radicals parallel with HPO − 4 ion‐radicals. It is shown that a part of the impurity chromium ions enters the crystal lattice in the trivalent state. As a result, paramagnetic centers with Cr 5+ ions of a different origin are formed by X‐irradiation in KDP: CrO 4 2− : Cr 5+ of an electronic nature (appearing in the reaction CrO 4 2−+ e − → CrO 4 3− ) and Cr 5+ of a hole nature (resulting from a successive capture of two holes by Cr 3+ ions). Thermal stabilities of these paramagnetic centers are found to be different. Principal g ‐values are determined for all investigated centers.