Electron paramagnetic resonance in ferrous fluosilicate at submillimeter wavelengths

Abstract

Electron paramagnetic resonance of divalent nickel in the low temperature phases of magnesium fluosilicate and magnesium fluotitanate J. Chem. Phys. 66, 3948 (1977); 10.1063/1.434445 Electron paramagnetic resonance of divalent nickel in zinc fluosilicate J. Chem. Phys. 66, 3297 (1977); 10.1063/1.434305 Electron paramagnetic resonance of divalent nickel in ferrous fluosilicateThe electron paramagnetic resonance spectrum of FeSiF 6 ·6H 2 0 was studied at 4.2 K in the parallel orientation using the I mm radiation from a CSF carcinotron. the 337 and 311 p.m radiation from an HCN laser and the 195 and 190 p.m radiation from a DCN laser. In addition, the submillimeter spectrum was measured at zero-field. A good fit of the data was obtained using the spin-Hamiltonian, H = DS; + E(S; -S;) + gl{3HS" with D = 11.88 cm-1 , E = 0.67 cm-1 , and gil = 1.96. The fit of the two highest field lines could be improved slightly by assuming that e, the angle between the z axis of a magnetic site and the crystallographic c axis. was about 4'.

Proton and Fluorine-Spin-Lattice Relaxation in Poly crystalline FeSiF6 • 6 H2O

“…Within a certain limit of error they exhibit the same dependence on tem perature and differ only by an approximate factor of 4. This can be clearly seen in the temperature range above the phase transition temperature T = 224 K. This temperature was also determined by a differential thermoanalysis and is in good agree ment with the value given by Rubins et al [1]. Below that temperature the difference between Ti (X H) and Ti (19F) seems to become slightly tem perature dependent.…”

“…Besides several other studies on FeSiFg • 6H2O, [1] and the literature cited therein, previous spinlattice relaxation time measurements performed on the proton spin system near He-temperature are also given by Skaeveland et al [2], and on the fluorine spin system in the temperature range 1 5 0 K^T^3 0 0 K by Birkeland and Svare [3]. However, these authors did not measure both the proton and fluorine spin-lattice relaxation simul taneously.…”

“…The approximate splittings of the states, 5D, 5T2g, bE, and 5A, are given. electron spin resonance [1], and spin-lattice relaxa tion time measurements [2] near 4 K the sphtting of 5A was determined to be about 10 and 40 cm-1. Thus, based on the sphtting pattern in Fig.…”

“…As pointed out by Rubins et al [1], the splitting pattern in Fig. 3 was constructed from experimental data assuming that the cubic crystal field sphtting of 5D is much greater than that of 5 T2g, which in turn is much greater than the spin orbit coupling con stant.…”

“…3. Splitting pattern of the 5D term under action of the crystal field and spin orbit coupling (after Rubins [1]). The approximate splittings of the states, 5D, 5T2g, bE, and 5A, are given.…”