Untersuchungen an quaternären Fluoriden LiMeIIMeIIIF6 Die Struktur von LiCaAlF6

Viebahn, W.

doi:10.1002/zaac.19713860311

Cited by 84 publications

(18 citation statements)

References 2 publications

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“…This doubling shows that the spectrum involves two magnetically conjugate spectra (KM = 2). In accordance with the space group D2d-P31c of the crystal [10] the number K M = 2 corresponds to a site with the Laue group G~L = C3i.…”

Section: Epr and Sh Of Gd 3+ Ions In Single Crystal Of Colquiriite LImentioning

confidence: 99%

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

et al. 1997

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Abstraet. In single crystal colquiriite LiCaA1F 6 doped with Gd 3+ ions two EPR speetra of the Gd 3+ ions with the Laue site-symmetry groups C i and C3i were observed. The spectrum angular dependente for trigonal Gd 3+ centre was investigated in detail and corresponding spin Hamiltonian parameters were fitted. From analysis of the spin Hamiltonian tensors B 4 and B 6 it was established that Gd 3 § with the Laue group C3~ substitutes at Ca 2 § site with the excess charge compensation by an ion located along the threefold axis from this site. The transformation formulas for a sixth-rank irreducible Hermitian tensor under coordinate rotation are tabulated in an explicit form. By using the EPR data for Gd 3~ substituted in a variety of host crystals, the fourth-rank and sixth-rank tensors of Gd 3+ spin Hamiltonians were tabulated and correlated with structures of the coordination polyhedra al substitution sites. The results suppose a predominante of quadratic crystal field contributions into the spin Hamiltonian tensor B 4 of Gd 3+.

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Section: Epr and Sh Of Gd 3+ Ions In Single Crystal Of Colquiriite LImentioning

confidence: 99%

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

et al. 1997

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“…III F 6 , where Me II stands for calcium, strontium or cadmium and Me III for aluminum, gallium, vanadium, chromium or iron) has been published more than thirty years ago [1]. In such a broad time range, colquiriites like LiCaAlF 6 (LiCAF), LiSrAlF 6 (LiSAF), LiSrGaF 6 (LiSGAF) and mixed crystals too, like LiSr x Ca 1-x AlF 6 (LiSCAF) [2] have been widely investigated both as laser crystals with Cr 3+ [3] and Ce 3+ -doping [4] and as undoped materials for UV windows [5] owing to their wide transparency range.…”

Section: Mementioning

confidence: 99%

Growth and characterization of LiCaGaF₆

Sani

Rabe

Reck

et al. 2004

Cryst. Res. Technol.

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Optically clear LiCaGaF 6 (LiCGaF) single crystals up to 15 mm length were grown by the Czochralski method from CaF 2 deficient melts. The substance melts incongruently at 751°C. No significant deviations of the crystal composition from the nominal stoichiometry Li:Ca:Ga=1:1:1 could be found. X-ray structure analysis revealed that the substance crystallizes in the colquiriite type structure. LiCaGaF 6 is transparent for optical wavelengths >140 -150 nm. The thermal expansion of the trigonal crystals is α 11 = α 22 = 18.7×10-

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“…As qua- [5]. An essential characteristic of these structures is the deformed two-layered close packing of fluorine atoms, the cations being placed in one-half of octahedral pores: Ca, Sr -(2b) C 31 ; Li -(2c) D3 ; Al -(2d) D 3 ; F -(12i) C, (Fig.…”

Section: Introductionmentioning

confidence: 99%

The analysis of spin Hamiltonian and crystal field tensors for Fe3+ in crystals of LiCaAlF6 and LiSrAlF6

et al. 1998

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In single crystals of LiCaA1F 6 and LiSrAIF6 doped with Fe" the trigonal EPR spectra with multiplicity KM = 1 were observed due to Fei substituted for Al'. The spin Hamiltonian parameters describing the fine structure and the superhyperfine structure were determined. It is argued that the tensors B2 and B4 of the spin Hamiltonian for Fei+ ions are essentially determined by the quadratic contributions of the crystal field at the substitution site. The signs and the relative values of the elements in the spin Hamiltonian tensor B4 of rank L = 4 for Fe' are determined by the irreducible tensor product [V4 ®V4]2 of the crystal field tensor V4 of rank L = 4 at the substitution sites. The ratio between the invariant sum of the spin Hamiltonian tensor B4 for Fe" in oxygen octahedra [Fe06] and that in fluorine octahedra [FeF6] is directly proportional to the fourth power of the ratio between the effective charges of surrounding ions. The sign of the spin Hamiltonian parameter B20 corresponds to the sign of the element [V4 ®V4]20 in the irreducible tensor product [V4 ®V4] 2 of rank L = 2.

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Untersuchungen an quaternären Fluoriden LiMe^IIMe^IIIF₆ Die Struktur von LiCaAlF₆

Abstract: LiCaAlF6 kristallisiert trigonal mit a = 4,996 Å und c = 9,636 Å, Z = 2, Raumgruppe P31c in einer vom Li2ZrF6‐Typ abgeleiteten Struktur. Die Verfeinerung nach der Methode der kleinsten Quadrate ergab R = 0,073.

Cited by 84 publications

References 2 publications

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

Growth and characterization of LiCaGaF₆

The analysis of spin Hamiltonian and crystal field tensors for Fe3+ in crystals of LiCaAlF6 and LiSrAlF6

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Untersuchungen an quaternären Fluoriden LiMeIIMeIIIF6 Die Struktur von LiCaAlF6

Abstract: LiCaAlF6 kristallisiert trigonal mit a = 4,996 Å und c = 9,636 Å, Z = 2, Raumgruppe P31c in einer vom Li2ZrF6‐Typ abgeleiteten Struktur. Die Verfeinerung nach der Methode der kleinsten Quadrate ergab R = 0,073.

Cited by 84 publications

References 2 publications

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

Growth and characterization of LiCaGaF6

The analysis of spin Hamiltonian and crystal field tensors for Fe3+ in crystals of LiCaAlF6 and LiSrAlF6

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Untersuchungen an quaternären Fluoriden LiMe^IIMe^IIIF₆ Die Struktur von LiCaAlF₆

Growth and characterization of LiCaGaF₆