ESR Study of LiIO<sub>3</sub>:Cr<sup>3+</sup>

Karthe, W.; Kühmstedt, R.

doi:10.1002/pssb.2220630145

Cited by 15 publications

(3 citation statements)

References 6 publications

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“…Thus, the zero-field splitting D for this centre should be positive, as pointed out in [10][11][12]. The result is opposite to the observed value [8,11]. So, model B is unreasonable.…”

Section: Introductionmentioning

confidence: 89%

“…(1) At room temperature (RT) and below RT, a trigonal symmetry Cr 3+ centre (called the low temperature centre Cr 3+ L) was found with zero-field splitting D ≈ −0.6099 cm −1 at RT by EPR study [8]. From the hyperfine interaction tensors of Li nuclei with Cr 3+ ions in α-LiIO 3 obtained from the method of radiofrequency discrete saturation (RFDS), Brauer and Daraselia [7] suggested that in the centre, the Cr 3+ ion replaces the Li + ion along the c-axis and the excess charge is compensated by two nearest V Li on the same axis.…”

Section: Introductionmentioning

confidence: 99%

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Defect models of the low and high temperature centres of in crystals

Zheng

1999

J. Phys.: Condens. Matter

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By analysing the EPR spectra of , the defect models of a low temperature centre and two high temperature centres and are suggested. In centre , the ion replaces the ion and excess charge is compensated by two nearest vacancies on the same axis. In centres and , the vacancies below and above the ion are, respectively, dissociated from the low temperature centre . The suggestions are supported by the theoretical calculations of EPR parameters D, and for the three centres. The reasonableness of these models is discussed.

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“…Thus, the zero-field splitting D for this centre should be positive, as pointed out in [10][11][12]. The result is opposite to the observed value [8,11]. So, model B is unreasonable.…”

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Defect models of the low and high temperature centres of in crystals

Zheng

1999

J. Phys.: Condens. Matter

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“…at Room Temperature and A 4 = 36.53 a.u. at Low Temperature (77 K), Respectively, 2 D in Units of cm -1 compd T (K)Δ R (Å)Δ X (Å)2 D g ∥ g ⊥ Δ g ( = g ∥ − g ⊥ ) Al 2 O 3 77 0.0419 0.02878 −0.3831 1.9858 1.9869 −0.0011 expt − −0.383 1.9840 1.9867 −0.0027 LiNbO 3 77 0.040 0.03583 −0.7730 1.9719 1.9753 −0.0034 expt −0.773 1.9720 LiTaO 3 300 0.0472 0.04665 −0.888 1.9696 1.9728 −0.0032 expt 42 −0.888 1.9720 LiIO 3 77 −0.054 0.0359 −1.2198 1.9647 1.9704 −0.0057 expt −1.2198 1.9650 1.9710 −0.0060…”

Section: Theoretical Methodsmentioning

confidence: 99%

Local Lattice Structure Study of the Octahedral (CrO₆)^9- Clusters for Cr³⁺ Ion Doping in a Variety of Oxide Crystals by Simulating the Corresponding EPR and Optical Spectra

2008

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On the basis of the 120 x 120 complete energy matrix, the local lattice structures of the octahedral (CrO6)9- clusters for Cr3+ ions doping in a variety of oxide crystals with D3d or C3v site symmetry have been studied by employing two distorted parameters, respectively. By simulating the calculated EPR and optical spectra data to the experimental results, the local lattice structure parameters are determined unambiguously. It is shown, by means of a series of calculations, that although the local lattice structures around the M (M = Al3+, Ga3+, Li+, Sc3+, etc.) ions in host crystals are obviously different, the local lattice structures of the octahedral (CrO6)9- clusters in a variety of oxide crystals doped with Cr3+ ions are similar and fluctuant in the vicinity of that of the Cr2O3. This may be ascribed to the fact that there is the similarly octahedral (CrO6)9- clusters in a variety of oxide crystals doped with Cr3+ and the Cr2O3 crystal. Our viewpoint is consistent with that of Gaudry et al. [Phys. Rev. B 2003, 67, 094108].

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ESR study of the paramagnetic 10 centre in an α‐LiIO₃ crystal

Martirosyan¹,

Meilman²,

Marov³

et al. 1975

Physica Status Solidi (b)

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V. 0. MARTIROSYAK e t al.: ESR Study of the Paramagnetic 10:-Center in a-LiI0, 791 phys. stat. sol. (b) 68, 791 (1975) Subject classification: 19; 22.8 Erevan State University ( a ) and V . I . Vernadskii Institute of Geochemistry and Analytical Chemistry, Academy of Sciences of the USSR, Moscow ( b ) ESR Study of the Paramagnetic 10;-Centre in an a-LiIO, Crystal BY V. 0. MARTIROSYAN (a), M. L. MEILMAN (b), I. N. MAROV (b), and V. V. SHUKOV (b) In crystals of a polar phase of cc-LiIO, a n ESR spectrum a t a frequency of v = 34.633 GHz and T = 290 OK is observed. The spectrum consists of t,wo sextets. Each line of the sextet splits into a doublet and a multiplet. The spectrum is attribut,ed to two centres of 10;with an equivalent structure. It is shown that a 27-electron centre, IO",, is formed from 10, ions under y-irradiation. The charge compensation is based on the oxidation of Fez+ present in crystals as an impurity. Experimental values of g-tensor, hf splitting and shf splitting are determined. The values of spin-Hamiltonian parameters and the mechanism of the centre formation and its location in the crystal are discussed. I n Kristallen einer polaren Phase von cc-LiIO, wird ein EPR,-Spektrum bei v = 34,633 GHz undT = 290 O K beobachtet. Das Spektrum hesteht aus zivei Sextetts. Jede Linie des Sextetts spaltet in ein Doublett und ein Multiplett auf. Das Spektrum wird zwei Zentren von .JOY mit einer aquivalenten Struktiir zugeordnet. Es wird gezeigt, dall ein 27-Elektronenzentrum J0:aus den JOY-Ionen unter y-Bestrahlung gebildet wird. Eine Ladungskompensation beruht auf der Oxydation von Fez+, das in den Kristallen als Storstellen vorhanden ist. Experimentelle Werte des g-Tensors und der hf-und shf-Aufspalbung werden bestimmt. Die Werte der Parameter des Spin-Hamiltonoperators und der Mechanismus der Zentrenbildung soivie deren Lokalisierung im Kristall werden diskutiert.

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ESR Study of LiIO₃:Cr³⁺

Cited by 15 publications

References 6 publications

Defect models of the low and high temperature centres of in crystals

Defect models of the low and high temperature centres of in crystals

Local Lattice Structure Study of the Octahedral (CrO₆)^9- Clusters for Cr³⁺ Ion Doping in a Variety of Oxide Crystals by Simulating the Corresponding EPR and Optical Spectra

ESR study of the paramagnetic 10 centre in an α‐LiIO₃ crystal

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ESR Study of LiIO3:Cr3+

Cited by 15 publications

References 6 publications

Defect models of the low and high temperature centres of in crystals

Defect models of the low and high temperature centres of in crystals

Local Lattice Structure Study of the Octahedral (CrO6)9- Clusters for Cr3+ Ion Doping in a Variety of Oxide Crystals by Simulating the Corresponding EPR and Optical Spectra

ESR study of the paramagnetic 10 centre in an α‐LiIO3 crystal

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ESR Study of LiIO₃:Cr³⁺

Local Lattice Structure Study of the Octahedral (CrO₆)^9- Clusters for Cr³⁺ Ion Doping in a Variety of Oxide Crystals by Simulating the Corresponding EPR and Optical Spectra

ESR study of the paramagnetic 10 centre in an α‐LiIO₃ crystal