Table 2. The isomer shift (IS) and the quadrupole splitting (QS) parameters obtained by fitting the time spectra of the nuclear resonant scattering of the SFO2.8 thin film at 300, 573, and 673 K. The directions of the electric field gradients of the Fe^3.5+ and Fe³⁺ doublet components are parallel to the in-plane direction of the film.

Temperature (K)	Component	Multiplet	IS (mm/s)	QS (mm/s)	Area (%)
	Fe4+	Singlet	0.01	—	55
300	Fe3.5+	Doublet	0.13	0.79	15
	Fe3+	Doublet	0.32	1.25	30
	Fe4+	Singlet	0.00	—	53
573	Fe3.5+	Doublet	0.10	0.81	14
	Fe3+	Doublet	0.22	1.23	33
673	Fe3.66+	Singlet	−0.04	—	100