Electron spin resonance spectra of Fe 3+ in single crystals of Sr 2 Ta 2 O 7 and Sr 2 Nb 2 O 7 have been investigated at 180°C and 250°C, respectively. The spectrum of Sr 2 Ta 2 O 7 is attributed to four orthorhombic Fe 3+ centers. Two of them show a super-hyperfine splitting at the liquid nitrogen temperature. Other two centers are also observed in Sr 2 Nb 2 O 7 at 250°C. Angular dependence of the spectra are described by a spin Hamiltonian with second order terms, D and E . The ratios of E to D and the directions of the principal axes for these centers are determined. Brief discussion on the site assignment of these Fe 3+ centers is given.
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Akishige et al. (1982) studied this question.
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