Mössbauer spectroscopy on57Fe: NaCl crystals

Barb, D.; Constantinescu, S.; Nistor, S. V.; Tarină, D.

doi:10.1007/bf02101053

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…Strong signals attributed to the Fe 3+ (I) centres were obtained by x-irradiation (W anode, 60 kV) of the crystals at LNT for about 15 minutes, followed by a brief (≈10 min) annealing at 190 K T 200 K. At this temperature, the now mobile self-trapped holes (V K centres) are trapped by the precursor Fe 2+ (I) centre, resulting in a maximum concentration of Fe 3+ (I) centres. Just before irradiation, the samples were annealed at T = 773 K for 10 minutes in an alumina boat and quenched to RT on a metal block in order to disperse the Fe 2+ ions which have a tendency to agglomerate in the NaCl lattice [9].…”

Section: Methodsmentioning

confidence: 99%

Electron - nuclear double-resonance study of a substitutional defect complex in x-irradiated NaCl crystals

Pawlik¹,

Nistor²,

Spaeth³

1997

J. Phys.: Condens. Matter

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We present an EPR/ENDOR study of the so-called Fe 3+ (I) centres produced by x-irradiation at T 200 K of NaCl:Fe crystals grown in a chlorine atmosphere which had previously been studied by means of EPR. It is shown that the Fe 3+ (I) centres each consist of a substitutional Fe 3+ ion with a defect in the nearest-neighbour chlorine site. The defect, which is responsible for the very large axial zero-field splitting of the Fe 3+ (I) centres, is either an interstitial Cl − i ion, which forms a weakly bound (Cl − i ) 2 split interstitial with the nearby substitutional Cl − ion, or a divacancy consisting of a nearest-neighbour Cl − vacancy and a Na + vacancy next to it on the same axis. At room temperature the Fe 3+ (I) centres are transformed into cubic Fe 3+ centres, in which the Fe 3+ ion is situated in an interstitial site.

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Section: Methodsmentioning

confidence: 99%

Electron - nuclear double-resonance study of a substitutional defect complex in x-irradiated NaCl crystals

Pawlik¹,

Nistor²,

Spaeth³

1997

J. Phys.: Condens. Matter

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show abstract

“…However, also other metal impurity cations such as Mn 2+ [13,14], [16]- [19], [36], [40]- [42], [45]- [50], Mg 2+ [1,21,36,41,42], Fe 2+ [15,17,19,36,41,42,51], Ni 2+ [42,52], Co 2+ [53], Sr 2+ [42,54] and Pb 2+ [42,55] have been the subject of many investigations and discussions. In fact, the host lattice need not necessarily be NaCl: the Suzuki phase may exist also in NaBr (Mn 2+ [50]), KCl (Sm 2+ [57], Pb 2+ [58] and Eu 2+ [56,59]), KBr (Mn 2+ [60] and Eu 2+ [59,61,62]), LiF (Mg 2+ [11,63]) and AgCl (Pb 2+ [64]) and even in oxides (MgO:Mn 4+ [31], [65]- [67], NiO:Mn 4+ [67] and CuO:Pb 4+ [32,68]).…”

Section: The Suzuki Structurementioning

confidence: 99%