Paramagnetic centers in X‐irradiated KH 2 PO 4  crystals doped with chromium | Zendy

Alybakov A. A. | Zendy; Abdrazakov A. A. | Zendy; Arbotoev O. M. | Zendy; Kudabaev K. | Zendy

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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.

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