EPR of trigonal Fe3+ centers in chlorinated SrCl2: Fe single crystals

Nistor, S. V.; Lazăr, D.P.; Käß, Hanno; Schoemaker, D.

doi:10.1016/s0038-1098(97)00338-4

Cited by 9 publications

(12 citation statements)

References 10 publications

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“…1. It is estimated that due to segregation effects, less than 300 ppm from the 1000 ppm iron added to the melt enter the SrCl 2 lattice, mainly as Fe 2ϩ ions.…”

Section: A Materialsmentioning

confidence: 99%

Magnetic resonance study of theFe+(I)center inSrCl
Vrielinck
¹
,
Callens
²
,
Matthys
³

et al. 2001
Phys. Rev. B
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An Fe ϩ -type center with axial ͗001͘ symmetry has been studied by electron nuclear double resonance ͑ENDOR͒ in the microwave X and Q bands. The Fe ϩ ͑I͒ center is produced only after irradiation with x or ␥ rays at 80 K of SrCl 2 :Fe 2ϩ crystals grown in a Cl 2 atmosphere. It has a 3d 7 4 F⌫ 8 ground state with spin S ϭ 3 2 . As shown by the correlated analysis of the ENDOR data and electron paramagnetic resonance superhyperfine structure, the Fe ϩ ion is situated in the center of a tetragonally compressed cube of eight nearest Cl Ϫ ions. The simplest model of the Fe ϩ ͑I͒ center, compatible with the magnetic resonance results, consists of an interstitial Fe ϩ ion with two substitutional monovalent cations, very likely K ϩ ions, in two opposite nearestneighbor Sr 2ϩ sites along the tetragonal axis of the center.

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“…1. It is estimated that due to segregation effects, less than 300 ppm from the 1000 ppm iron added to the melt enter the SrCl 2 lattice, mainly as Fe 2ϩ ions.…”

Section: A Materialsmentioning

confidence: 99%

Magnetic resonance study of theFe+(I)center inSrCl
Vrielinck
¹
,
Callens
²
,
Matthys
³

et al. 2001
Phys. Rev. B
Self Cite
9
1
5
0
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“…An entirely different picture of the impurity type electron and hole trapping centers was found in chlorinated SrCl 2 : Fe crystals, i.e., in crystals which were grown in a chlorine atmosphere. EPR studies on such crystals x-ray irradiated at low temperature (below 100 K) resulted in the identification of new iron based hole and electron trapping centers, namely, a trapped hole Fe 3+ center with local trigonal symmetry 4 and the two trapped electron Fe + ͑I͒ and Fe + ͑II͒ centers, both with local tetragonal symmetry. 5 It was also found that the two tetragonal Fe + centers exhibit very different paramagnetic properties and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

X- andQ-bandENDORstudy of the
Ghica
¹
,
Nistor
²
,
Vrielinck
³

et al. 2004
Phys. Rev. B
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The ͗001͘ axially symmetric Fe + ͑II͒ center observed in SrCl 2 :Fe 2+ crystals has been studied by the electron nuclear double resonance ͑ENDOR͒ technique in the microwave X and Q bands. This center is produced only in crystals grown in chlorine atmosphere and x-ray irradiated at low temperature (below 100 K). The analysis of the ENDOR spectra unambiguously confirms the structural model earlier suggested by the electron paramagnetic resonance ͑EPR͒ study, as a Fe + ion strongly displaced off center along an ͗001͘ axis, almost in the center of the square determined by the four nearest Cl − ligands. The unpaired spin densities f 3s and f 3p in the 3s and 3p chlorine orbitals have been determined from the resulting ENDOR parameters.

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“…The ESR studies have been performed on chlorinated SrCI2 : Fe2+ single crystals employed in our previous study [4], in the X-band, between 1.6 and 300K.…”

Section: Resultsmentioning

confidence: 99%

ESR of trapped-electron Fe⁺centres in chlorinated SrCl₂crystals

Nistor

Stefan

Bouwen

et al. 1999

Radiation Effects and Defects in Solids

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ESR of trapped-electron Fe + centres in chlorinated SrCl 2 crystals, Radiation Effects Two Fe+ centres have been identified by ESR after X-ray irradiation at 80 K of chlorinated SrC12 : Fe2+ crystals. Both centres, with tetragonal symmetry, consist of an Fe+ ion with a neighbouring charged defect along the (001) symmetry axis. The substitutional Fe' ion of the Fe'(1) centre is strongly off-centre displaced in the Fe+(II) centres, in the middle of a square of four nearest neighbour chlorine ligands.

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EPR of trigonal Fe3+ centers in chlorinated SrCl2: Fe single crystals

Cited by 9 publications

References 10 publications

Magnetic resonance study of theFe+(I)center inSrCl
Vrielinck
¹
,
Callens
²
,
Matthys
³

et al. 2001
Phys. Rev. B
Self Cite
9
1
5
0
View full text Add to dashboard Cite

Magnetic resonance study of theFe+(I)center inSrCl
Vrielinck
¹
,
Callens
²
,
Matthys
³

et al. 2001
Phys. Rev. B
Self Cite
9
1
5
0
View full text Add to dashboard Cite

X- andQ-bandENDORstudy of the
Ghica
¹
,
Nistor
²
,
Vrielinck
³

et al. 2004
Phys. Rev. B
Self Cite
14
1
9
0
View full text Add to dashboard Cite

ESR of trapped-electron Fe⁺centres in chlorinated SrCl₂crystals

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EPR of trigonal Fe3+ centers in chlorinated SrCl2: Fe single crystals

Cited by 9 publications

References 10 publications

Magnetic resonance study of theFe+(I)center inSrClVrielinck1, Callens2, Matthys3 et al. 2001Phys. Rev. BSelf Cite9150View full textAdd to dashboardCite

Magnetic resonance study of theFe+(I)center inSrClVrielinck1, Callens2, Matthys3 et al. 2001Phys. Rev. BSelf Cite9150View full textAdd to dashboardCite

X- andQ-bandENDORstudy of theGhica1, Nistor2, Vrielinck3 et al. 2004Phys. Rev. BSelf Cite14190View full textAdd to dashboardCite

ESR of trapped-electron Fe+centres in chlorinated SrCl2crystals

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Magnetic resonance study of theFe+(I)center inSrCl
Vrielinck
¹
,
Callens
²
,
Matthys
³

et al. 2001
Phys. Rev. B
Self Cite
9
1
5
0
View full text Add to dashboard Cite

Magnetic resonance study of theFe+(I)center inSrCl
Vrielinck
¹
,
Callens
²
,
Matthys
³

et al. 2001
Phys. Rev. B
Self Cite
9
1
5
0
View full text Add to dashboard Cite

X- andQ-bandENDORstudy of the
Ghica
¹
,
Nistor
²
,
Vrielinck
³

et al. 2004
Phys. Rev. B
Self Cite
14
1
9
0
View full text Add to dashboard Cite

ESR of trapped-electron Fe⁺centres in chlorinated SrCl₂crystals