EPR of a VO 2+ ‐Doped Fe(NH 4 ) 2  (SO 4 ) 2  · 6H 2 O Single Crystal. VO 2 Fe 2+  Exchange Interaction and Spin–Lattice Relaxation Time of Host Fe 2+  Ions | Zendy

Misra Sushil K. | Zendy; Sun Jiansheng | Zendy; Orhun U. | Zendy

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EPR of a VO 2+ ‐Doped Fe(NH 4 ) 2 (SO 4 ) 2 · 6H 2 O Single Crystal. VO 2 Fe 2+ Exchange Interaction and Spin–Lattice Relaxation Time of Host Fe 2+ Ions

Author(s) -

Misra Sushil K.,

Sun Jiansheng,

Orhun U.

Publication year - 1990

Publication title -

physica status solidi (b)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.51

H-Index - 109

eISSN - 1521-3951

pISSN - 0370-1972

DOI - 10.1002/pssb.2221620232

Subject(s) - electron paramagnetic resonance , ion , crystallography , chemistry , impurity , single crystal , crystal structure , analytical chemistry (journal) , doping , hyperfine structure , nuclear magnetic resonance , materials science , atomic physics , condensed matter physics , physics , organic chemistry , chromatography

X‐band (≈9.5 GHz) electron paramagnetic resonance (EPR) studies of the VO 2+ ion are carried out on a single crystal of the Tutton salt Fe(NH 4 ) 2 (SO 4 ) 2 · 6H 2 O (FASH) at 295, 80, and 4.2 K. The data indicate two physically‐equivalent VO 2+ sites in the unit cell, each consisting of three magneticallyinequivalent VO 2+ ions. The principal values and direction cosines of the principal axes of the g 2 and A 2 tensors are evaluated, using a least‐squares‐fitting program. An impurity [VO(H 2 O) 5 ] 2+ complex model of the vanadyl ion is found to explain the data well. The V 4+ O 2− bond directions for the VO 2+ ions are deduced. The VO 2+ Fe 2+ exchange‐interaction constant in FASH is estimated. The host‐ion (Fe 2+ ) spin‐lattice relaxation time is estimated from VO 2+ EPR linewidth.

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