E.P.R. study of Mn2+in lithium potassium tartrate (LPT) and its isomorphism with lithium ammonium tartrate (LAT)

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Abstract
An E.P.R. study of Mn2+ in single crystals of LiKC4H4O6. H2O (LPT) was carried out from ∼300 K to 77 K and four magnetically differently oriented but symmetry related triclinic complexes of Mn2+ were observed. Spin hamiltonian parameters were obtained at ∼ 300 K. The E.P.R. results suggest that LPT is not only isomorphous but also isostructural to LiNH4C4H4O6 . H2O (LAT). In LPT no structural phase transition could be detected in the temperature range 300 K to 77 K. The observed small magnitude of the low symmetry effect is attributed to the small contribution of fourth order crystal field terms relative to that of the second order crystal field terms, to the zero-field splittings of the 6 S ground state of Mn2+. A temperature dependent anomalous behaviour is observed in the low field region of the E.P.R. spectrum for B//[010] and its neighbourhood.

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