Paramagnetic resonance of trivalent iron in benitoite

Vinokurov, V. M.; Zaripova, M. M.; Степанов, В. Г.; Chirkin, G. K.; Shekun, L. Ya.

doi:10.1007/bf00747946

Cited by 2 publications

(7 citation statements)

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“…(2) the tensor component which is invariant relative to a symmetry group Gs C R ___ U. For this purpose, the SH is decomposed in a system of the linear combinations of irreducible (relative to the rotation group) tensor operators Tzr ' which transform according to the irreducible representations F i [12] of the group G~: Fi(j),l~l (19) The a, ti, y-dependence of the sum SL(Ct, q 7, Gs) in Eq. =-~l~B40(6t, ti)+ 2~2~B44(6t, ti, Y)" (21) In the case of SH Eqs.…”

Section: Analysis Of Sh Tensors Of Gd 3+ In Licaaifmentioning

confidence: 99%

“…(40) that the appropriate elements of tensor B sM for the octahedron and tetrahedron are of the same sign. [19] enables one to assume that the parameter of cubicity B4r of the SH tensor B 4 for Gd 3+ is of negative sign in any surrounding.…”

Section: (38)mentioning

confidence: 99%

“…(19) reflects the fact that a value of SL(a, ,8, y, G~) is determined in a rotated coordinate system X', Y', Y' described by the Eulerian angles a, ti, 7 with respect to the old system X, Y, Y.Having been determined in such a way the value of Sc(a, ,8, y, Gs) remains invariant under transformation of the group G s. The angles (a i, fl~, ~) at which the sum SL(ct, ti, y, Gs) takes a maximum value will define the principal axis system (Xi, Yi, Zi, G~) of the tensor component of symmetry Gs in the tensor A c. The distortion coefficient dL(G~) = [S L -max SL(a, q y, G~)]/S z characterizes distortion of the tensor A L relative to symmetry G s. If dL(Gs) = 0, the tensor A L has symmetry G~. We will now consider the often encountered cases: L = 4 and 6, G, = O n. L = 4, G s = O h .…”

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EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

et al. 1997

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Abstraet. In single crystal colquiriite LiCaA1F 6 doped with Gd 3+ ions two EPR speetra of the Gd 3+ ions with the Laue site-symmetry groups C i and C3i were observed. The spectrum angular dependente for trigonal Gd 3+ centre was investigated in detail and corresponding spin Hamiltonian parameters were fitted. From analysis of the spin Hamiltonian tensors B 4 and B 6 it was established that Gd 3 § with the Laue group C3~ substitutes at Ca 2 § site with the excess charge compensation by an ion located along the threefold axis from this site. The transformation formulas for a sixth-rank irreducible Hermitian tensor under coordinate rotation are tabulated in an explicit form. By using the EPR data for Gd 3~ substituted in a variety of host crystals, the fourth-rank and sixth-rank tensors of Gd 3+ spin Hamiltonians were tabulated and correlated with structures of the coordination polyhedra al substitution sites. The results suppose a predominante of quadratic crystal field contributions into the spin Hamiltonian tensor B 4 of Gd 3+.

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Section: Analysis Of Sh Tensors Of Gd 3+ In Licaaifmentioning

confidence: 99%

Section: (38)mentioning

confidence: 99%

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confidence: 99%

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EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

et al. 1997

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“…A simple mean of the diagonal gª values for Fe3+(II) is a little larger than that for Fe3+(I). The ZFS and the spectrum anisotropy are mainly determined by the relatively large values of the rank-2 ZFS parameters for both centers, which are of the same order of magnitude as for Fe 3 § ions at the mirror symmetry sites in forsterite [2] and chrysoberyl [4]. In the principal axis system of the rank-2 ZFS tensor chosen to satisfy the orthorhombic standardization [15,16] (2) M=I Oxygen-coordinated Fe 3 § ions at the octahedral sites exhibit distinctly larger values of S 4 [17].…”

Section: Resultsmentioning

confidence: 99%

“…In forsterite Mg2SiO a, Fe 3+ ions were established as substituting at all the three structurally nonequivalent cationic sites [2,3]: the octahedral MI (4a) and M2 (4c) sites, and the tetrahedral (4c) sites. In chrysoberyl A12BeO 4, Fe 3+ ions were established as substituting for Al 3+ at the octahedral M2 site [4]. Previously we have reported [5] that in the Cr-doped crystal of LiScGeO 4, along with electron paramagnetic resonance (EPR) spectra of Cr 3+ at the Sc 3 § sites, additional weak lines were observed.…”

Section: Introduetionmentioning

confidence: 99%

Electron paramagnetic resonance study of Fe3+ ions at octahedral and tetrahedral mirror symmetry sites in the LiScGeO4 crystal

et al. 2004

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An electron paramagnetic resonance (EPR) study of a synthetic single crystal of LiScGeO• doped with Cr ions earried out earlier at the X-and Q-bands at 300 K has indicated additional weak lines. A detailed analysis of these EPR lines, which were tentatively attributed to the Fe 3+ ions at two different mirror symmetry sites, is presented in this paper. The angular dependences in the three crystallographic planes were resolved by fitting the two distinct spectra denoted Fe3+(l) and Fe3+(II) with a spin Hamiltonian (S = 5/2) of monoclinic symmetry. The rank-4 crystal field tensors at tetrahedral and octahedral sites were calculated with the point-charge model to determine the principal axis ofientations of their cubic, letragonal and trigonal components. A comparative analysis of the zero-field splitting tensors and the crystal field ones indicates that Fe3+(I) ions substitute for Sc 3 § at octahedral sites and Fe3+(II) ions substitute for Ge 4~ at tetrahedral sites with no significant distortion of the coordination polyhedra in the structure of LiScGeO 4. IntroduetionThe structure of LiScGeO 4 belongs to the orthorhombic space group D~ 6 Pnma with a = 1.0673 nm, b = 0.59926 nm, c = 0.49667 nm [1]. Fe 3+ ions in low concentrations ate usual traces in the natural and synthetic crystals with olivine type structure thus determining their spectroscopic properties. In forsterite Mg2SiO a, Fe 3+ ions were established as substituting at all the three structurally nonequivalent cationic sites [2, 3]: the octahedral MI (4a) and M2 (4c) sites, and the tetrahedral (4c) sites. In chrysoberyl A12BeO 4, Fe 3+ ions were established as substituting for Al 3+ at the octahedral M2 site [4]. Previously we have reported [5] that in the Cr-doped crystal of LiScGeO 4, along with electron paramagnetic reso-

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Paramagnetic resonance of trivalent iron in benitoite

Cited by 2 publications

References 1 publication

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

Electron paramagnetic resonance study of Fe3+ ions at octahedral and tetrahedral mirror symmetry sites in the LiScGeO4 crystal

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