Abstract
The phase transitions undergone by Ca 2Ba(C 2H 5COO) 6 single crystal have been studied via the X-band EPR of Mn 2+ in the temperature range 77–360 K. Two transitions have been detected at 267 K and at 207 K. The former is established to be a first order, while the latter a second-order phase transition, as deduced from the behaviour of the overall splitting of EPR lines and that of the EPR linewidth, as functions of temperature. The room temperature Mn 2+ spin Hamiltonian parameters are evaluated using a rigorous least-squares-fitting procedure. The angular variation of EPR spectra are studied in a number of planes to establish uniquely the orientations of the magnetic Z axes of the various Mn 2+ complexes in the unit cell. The angular variations of EPR spectra at various temperatures indicate that below 267 K the crystal structure is tetragonal.
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