Optische und elektrische Erscheinungen in LiF‐Kristallen mit Kobalt

Huml, K.; Bohun, A.

doi:10.1002/pssb.19630030206

Cited by 10 publications

(7 citation statements)

References 3 publications

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“…3 for unirradiated F3 crystal showing that the irradiation effects are completely bleached out by this heat treatment. 5,191. However, the complexes in the ions give rise to the intense ultraviolet absorption, which is absent in the solution [5,61.…”

Section: ~8mentioning

confidence: 97%

“…5,191. However, the complexes in the ions give rise to the intense ultraviolet absorption, which is absent in the solution [5,61. At least in some cases the ultraviolet absorption is due to localized exciton absorption in the neighbourhood of the impurity [20].…”

Section: ~8mentioning

confidence: 97%

“…The behaviour of the ionic conductivity of LiF:Mg crystals [ l ] is quite different from that of LiF : Mn crystals [ 2 ] . I n view of this and the recent interest in optical properties of alkali halides doped with transition metal ions [4, 5,61, detailed investigations have been made on the electrical and optical properties of titanium-doped LiF crystals and the results are reported in this paper.…”

Section: Introductionmentioning

confidence: 98%

“…The electrical properties of lithium fluoride crystals have been studied with magnesium [ l ] and manganese [2] dopants, and optical properties with magnesium [3], nickel [4], and cobalt [5] dopants by earlier authors. The behaviour of the ionic conductivity of LiF:Mg crystals [ l ] is quite different from that of LiF : Mn crystals [ 2 ] .…”

Section: Introductionmentioning

confidence: 99%

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Electrical and Optical Properties of Titanium‐Doped Lithium Fluoride Crystals

Jain

Sootha

1967

Physica Status Solidi (b)

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Measurements are made of the electrical conductivity and optical absorption of LiF crystals doped with Ti. The plot of log (u T) as a function of 1/T shows the usual intrinsic and extrinsic regions. I n the extrinsic region, the behaviour of titanium is found to be similar to that of magnesium but different from that of manganese. The results indicate that most of the titanium is present in a highly aggregated form. However, a small fraction of the titanium is atomically dispersed in the form of doubly positively charged centres, either as Ti?+ or as stable pairs of Ti3+ and a cation vacancy. The values of the energies derived from the conductivity plot are W = 2.74 eV for the energy of formation of a sepa-

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Section: ~8mentioning

confidence: 97%

Section: ~8mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Electrical and Optical Properties of Titanium‐Doped Lithium Fluoride Crystals

Jain

Sootha

1967

Physica Status Solidi (b)

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“…Influence of high-temperature annealing of 10 min duration after deformation ( 6 = 0.01) on the LiF (0.15% Mg) density variation during subsequent isochronal annealing. The high-temperature annealing was held at: 2 -420 "C, 3 -500 C , 4 -600 C. 1 -non-annealed, 5 -the same a s curve 1 in Fig. 1 0 0 (0.15% Mg) crystals begins at earlier stages (200 "C) than from undeformed ones (300 OC) and proceeds more completely.…”

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confidence: 99%

Influence of Plastic Deformation on Magnesium Precipitation in LiF Crystals

Andreev

Смирнов

1969

Physica Status Solidi (b)

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In alkali halide crystals with divalent cation ions substitutionally incorporated in the lattice, impurity precipitation is preceeded by an agglomeration of point defects including as a first step the formation of impurity-vacancy dipoles (1 to 5).The nuclei of the new phase are to be formed from impurity-vacancy clouds. The initial precipitates are too small to be observed by light microscopy and too scarce for detection by the X-ray diffraction techniques. One method which can be used for investigation of precipitation processes is the determination of bulk density e (6) since the cation vacancies necessary to maintain charge neutrality will not remain in the crystal lattice after precipitation of divalent impurities. Besides, the volume expansion caused by relaxation around the impurity ion must disappear (6).In the work reported here this method was used for studying the influence of defects (dislocations + point defects) on the decomposition of rather dilute solid LiF: Mg solutions.We have used LiF crystals (containing 0.03 and-0.15% Mg) grown by the Kyropoulos method which were annealed at 750 "C for 48 h and subsequently cooled with a rate of 5 per hour. The crystal density was not influenced by this heat treatment. 3The specimen@ were prepared by cleavage of crystals to dimensions of 4 x 4~1 2 mm .The samples were deformed by compression along [ 0011 direction with the constant straining rate of 10 -4 s-I. Plates (about 1 x 2~2 mm ) were cut from the middle part of the deformed specimen. These plates were subjected to a pulsating isochronal

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Transition metal impurities in alkali halides. I. Optical absorption of 3d transition metal ions

Sootha

1970

Phys. Stat. Sol. (a)

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Optische und elektrische Erscheinungen in LiF‐Kristallen mit Kobalt

Abstract: Meßergebnisse der Absorption, thermostimulierten Exoelektronenemission und Lumineszenz von unbestrahlten und röntgenbestrahlten LiF‐Kristallen mit Kobalt‐Dotierung werden mitgeteilt und unter der Annahme der Bildung von Kobaltkomplexen und Kobalt‐aggregaten diskutiert.

Cited by 10 publications

References 3 publications

Electrical and Optical Properties of Titanium‐Doped Lithium Fluoride Crystals

Electrical and Optical Properties of Titanium‐Doped Lithium Fluoride Crystals

Influence of Plastic Deformation on Magnesium Precipitation in LiF Crystals

Transition metal impurities in alkali halides. I. Optical absorption of 3d transition metal ions

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