Abstract
X-band EPR of Mn 2+-doped single crystal of Ca 2Sr(C 2H 5COO) 6 has been used to study the phase transitions experienced by this crystal. Two phase transitions, a second-order transition at 278 ± 5 K and a first-order phase transition at 103 ± 10 K, have been deduced from the behaviour of overall splitting of lines and that of EPR linewidth, as functions of temperature. The angular variations of Mn 2+ EPR spectra have been studied in order to establish the orientations of the magnetic Z axes of the various Mn 2+ complexes in the unit cell. Further, from the behaviour of overall splitting of lines for the magnetic field orientations along the Z and X magnetic axes, as a function of temperature, a hypothetical phase transition to cubic symmetry has been deduced to occur at about 783 K. The room-temperature spin-Hamiltonian parameters are evaluated, using a rigorous least-squares fitting procedure. It is concluded, from the angular variation of the spectra, that the crystal structure is tetragonal below 278 K. Linewidth behaviour is studied to discuss the ordering of the ions surrounding Mn 2+.
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