The Crystal Structures of SrAlF5 and Ba0.43(1)Sr0.57(1)AlF5

Kübel, Frank

doi:10.1002/(sici)1521-3749(199809)624:9<1481::aid-zaac1481>3.0.co;2-f

Cited by 42 publications

(37 citation statements)

References 12 publications

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“…To ensure convergence, a large cluster consisting of 21176 ions was generated using the crystal structure data for SrAlF 5 from Ref. [1].…”

Section: Crystal Field Calculations Of the Cementioning

confidence: 99%

“…The energy level splitting for all possible Ce 3+ positions, calculated using two experimental PL excitation spectra (for (c) and (b) PL centers), is shown in table 3 and as bars on figures 4 and 6. The enumeration of Sr 2+ sites is according to [1]. Direct comparison of the calculated splittings of the cerium 5d states with the experimental excitation spectra can help in identifying the Sr positions, which are preferably occupied by Ce 3+ ions.…”

Section: Crystal Field Calculations Of the Cementioning

confidence: 99%

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A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

Omelkov

Brik

Kirm

et al. 2011

J. Phys.: Condens. Matter

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Abstract. The present research is focused on the 4f-5d transitions in Ce 3+ centers doped into tetragonal β-SrAlF 5 single crystals belonging to I4 1 /a space group. The presence of 4 non-equivalent Sr 2+ sites in this compound leads to appearance of 3 spectroscopically non-equivalent Ce 3+ luminescence centers, which can be well distinguished using time-resolved laser spectroscopy technique. All 4f-5d transitions have slightly varying excitation and emission energies with the characteristic probabilities resulting in several decay times determined experimentally. One of these centers experiences strong perturbation due to a defect nearby, probably the O 2− impurity ion substituting F − ion and acting as charge compensator as well. Identification of these photoluminescence centers is performed using crystal field calculations. The crystal field parameters are calculated for two identified centers using the structural data for SrAlF 5 ; diagonalization of the crystal field Hamiltonian results in getting the splitting of the Ce 3+ 5d states. This method allowed assigning of "regular" unperturbed Ce 3+ centers with selected Sr 2+ sites.

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“…To ensure convergence, a large cluster consisting of 21176 ions was generated using the crystal structure data for SrAlF 5 from Ref. [1].…”

Section: Crystal Field Calculations Of the Cementioning

confidence: 99%

Section: Crystal Field Calculations Of the Cementioning

confidence: 99%

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

Omelkov

Brik

Kirm

et al. 2011

J. Phys.: Condens. Matter

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“…SrAlF 5 is a potential host material for optical applications in the far UV [6] with a complex crystal structure [7]. * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Sm2+ as a probe of crystal field in fluorides and fluorohalides: Effect of pressure and temperature

Penhouet

Hagemann

2008

Journal of Alloys and Compounds

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This article was published in an Elsevier journal. The attached copy is furnished to the author for non-commercial research and education use, including for instruction at the author's institution, sharing with colleagues and providing to institution administration.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. AbstractThe luminescence of Sm 2+ substituting for Sr 2+ or Ba 2+ has been studied in SrFBr, BaFBr, BaFI and SrAlF 5 . The pressure induced shifts of the intra-configurational 5 D 0,1 → 7 F 0,1,2 observed in the MFX crystals are about three times larger than those observed in ruby, confirming thus some potential of these systems as pressure sensors.The comparison of excitation spectra in MFX shows that the position of the lowest 4f 5 5d 1 band shifts strongly to the red passing from SrFBr to BaFI. In BaFI, one observes simultaneously intra-configurational and inter-configurational emission.The non-degenerate 5 D 0 → 7 F 0 emission of Sm 2+ in SrAlF 5 confirms the presence of four crystallographic sites for Sr. Site selective spectra show clear differences for the different sites. Spectra as a function of pressure reveal different pressure shifts for the different sites.

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“…Besides the two modifications a '- [6] and b-SrAlF 5 [7,8], Sr 5 Al 2 F 16 is an additional crystallographically well characterized strontium aluminium fluoride. A tetragonal phase ªSr 2 AlF 7 º has not been observed in the experiments.…”

Section: Discussionmentioning

confidence: 99%

“…In the pseudobinary system SrF 2 /AlF 3 two compounds have been described with the formulas SrAlF 5 and Sr 2 AlF 7 . As to the first compound, two modifications a '-SrAlF 5 [6] and b-SrAlF 5 [7,8] have so far been crystallographically characterized. To the second compound, Sr 2 AlF 7 , preparation of a microcrystalline material and tetragonal lattice parameters determined from a Debye-Scherrer photograph have been reported [9].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Crystal Structure of the Strontium Aluminium Fluoride Sr5Al2F16

Weil¹

2001

Z. anorg. allg. Chem.

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Single crystals of Sr 5 Al 2 F 16 crystallize in colourless translucent plates and have been prepared by solid state synthesis, starting from stoichiometric mixtures of the binary fluorides. The crystal structure has been determined and refined from single crystal diffractometer data (orthorhombic, space group Ccca (no. 68), a = 7.4488(4) A Ê , b = 12.4714(7) A Ê , c = 14.1411(8) A Ê , V = 1313.67(13) A Ê 3 , Z = 4, R[F 2 > 2r(F 2 )] = 0.025; wR2(F 2 all) = 0.056, 971 structure factors, 56 parameters) and can be derived from a slightly distorted c.c.p. arrangement where 7/8 of the c.c.p. positions are occupied by the metal atoms. The main features of the structure are AlF 6 octahedra and SrF 8 polyhedra with mean distances d(Al±F) = 1.791 A Ê and d(Sr±F) = 2.531 A Ê , respectively.

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The Crystal Structures of SrAlF5 and Ba0.43(1)Sr0.57(1)AlF5

Cited by 42 publications

References 12 publications

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

Sm2+ as a probe of crystal field in fluorides and fluorohalides: Effect of pressure and temperature

Preparation and Crystal Structure of the Strontium Aluminium Fluoride Sr5Al2F16

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The Crystal Structures of SrAlF5 and Ba0.43(1)Sr0.57(1)AlF5

Cited by 42 publications

References 12 publications

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce3 +ions in SrAlF5crystals

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce3 +ions in SrAlF5crystals

Sm2+ as a probe of crystal field in fluorides and fluorohalides: Effect of pressure and temperature

Preparation and Crystal Structure of the Strontium Aluminium Fluoride Sr5Al2F16

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A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals

A luminescence spectroscopy and theoretical study of 4f–5d transitions of Ce^{3 +}ions in SrAlF₅crystals