A simple criterion for forecasting off-centre configuration of monovalent impurity ions in alkali halide crystals

Bosi, L.; Nimis, M.

doi:10.1007/bf02450552

Cited by 10 publications

(10 citation statements)

References 3 publications

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“…In this context we want to stress that the cut Z values we found previously [4] for Li § and F-(in this case z = r*/r_) are lower: Li § and F-are off-centre when Z < 0.59 and when X < 0.66, respectively (approximation B)). As a consequence, we should be compelled to the conclusion that the cut criterion is not univocal for all the impurities.…”

Section: Pacs 6170 -Defects In Crystalsmentioning

confidence: 95%

“…As in previous work [4] we want to stress that, on the basis of the definition itself of partial charge, it is not clear which value for the impurity radius we must adopt; nevertheless we have preferred approximation B), since we think simply that the impurity ion should tend to assume the 8 value of the host crystal because the influence of the partial charge placed on many nearest-neighbour ions prevails over that due to a single (impurity) ion.…”

Section: Pacs 6170 -Defects In Crystalsmentioning

confidence: 96%

“…[3] have been presented in table I of our previous works [4,5] together with the values for the partial charges. [7] (*) The systems marked with a question mark were not explicitly checked, at that time [6], for off-centre behaviour which, however, was thought unquestionably true by the authors quoted in ref.…”

Section: Pacs 6170 -Defects In Crystalsmentioning

confidence: 99%

“…With the aid of the Sanderson model for nonmolecular structures [1][2][3] we have previously [4] derived a simple criterion for forecasting off-centre configuration of monovalent impurity ions (Li § F-) in alkali halides based on the effect that the Sanderson partial charges on atoms have on their radii.…”

Section: Pacs 6170 -Defects In Crystalsmentioning

confidence: 99%

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On the possibility of a forecast for off-centre configuration of Ag+ and Cu+ in alkali halide crystals

Bosi¹,

Nimis²

1990

Nuovo Cim D

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Summary. --The simple cut criterion based on the accurate determination of the radii of the ions in alkali halides and previously introduced by the authors for forecasting off-centre configuration of Li § and F-has been extended to heavy ions (Ag § and Cu+). It has been found that this criterion is valid for the Ag § ion, whereas for Cu § gives a less precise forecast because of the lack in knowledge of the effective partial charge on Cu § ion. It has been evidenced that the critical value of the ratio r*/r+ between impurity and host ion radius which allows off-centre configuration is dependent on the impurity ion mass. This model is able to give also prediction for FA(II) centre formation in alkali halides [5].The aim of this paper is to present an effort to verify the validity of our criteria for heavy monovalent isoelectronic impurity ions (Ag § Cu § which have been the most extensively investigated in the literature. In table I we present the data obtained for Ag § impurity. As in our previous works, the Ag § radius is (*) Work jointly supported by the Ministero della Pubblica Istruzione and by Consiglio Nazionale delle Ricerche, Gruppo Nazionale di Struttura della Materia. 851

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Section: Pacs 6170 -Defects In Crystalsmentioning

confidence: 95%

Section: Pacs 6170 -Defects In Crystalsmentioning

confidence: 96%

Section: Pacs 6170 -Defects In Crystalsmentioning

confidence: 99%

Section: Pacs 6170 -Defects In Crystalsmentioning

confidence: 99%

See 2 more Smart Citations

On the possibility of a forecast for off-centre configuration of Ag+ and Cu+ in alkali halide crystals

Bosi¹,

Nimis²

1990

Nuovo Cim D

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“…Actually, in a preliminary paper [5] we derived a simple criterion for forecasting off-centre configuration in the ground state of light monovalent (Li +, F-) impurity ions in alkali halide crystals based on the effect that the Sanderson partial charges on atoms have on their radii.…”

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confidence: 99%

Analysis of a qualitative criterion for forecasting off-centre displacement of impurity ions in ionic crystals

Bosi

Nimis

1991

Il Nuovo Cimento D

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Summary. --With the aid of the Sanderson model for nonmolecular structure a qualitative criterion is derived for forecasting off-centre configurations of monovalent impurity ions (Li + , F-, CI-, Na § , Ag § , Cu + ) in alkali halide crystals. The same criterion is checked for Mn z+ impurity ions in some oxides. We also present a critical review of the criteria introduced in the past, as well as of the experimental results up to now known in the literature.PACS 61.70 -Defects in crystals.

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Review of Emission and Lifetime Data Concerning Cu+ Fluorescence in Alkali Halides

Bosi

Gallo

et al. 2001

phys. stat. sol. (b)

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A review of the relevant data concerning the decay properties of the Cu þ fluorescence in alkali halides is presented. A critical analysis of the experiments reported in literature shows that the problem of the correct and complete interpretation of the Cu þ fluorescence was made complicated in the past essentially because of historical reasons. The validity of the decay models was ascertained by the authors by simultaneously detecting both lifetime and quantum yield during each set of measurements as a function of the temperature.

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A simple criterion for forecasting off-centre configuration of monovalent impurity ions in alkali halide crystals

Cited by 10 publications

References 3 publications

On the possibility of a forecast for off-centre configuration of Ag+ and Cu+ in alkali halide crystals

On the possibility of a forecast for off-centre configuration of Ag+ and Cu+ in alkali halide crystals

Analysis of a qualitative criterion for forecasting off-centre displacement of impurity ions in ionic crystals

Review of Emission and Lifetime Data Concerning Cu+ Fluorescence in Alkali Halides

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