High-frequency tunable EPR spectroscopy of Cr3+ in synthetic forsterite

Shakurov, G. S.; Tarasov, V. F.

doi:10.1007/bf03162432

Cited by 21 publications

(9 citation statements)

References 18 publications

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“…Therefore, there are some mechanisms favorable for the formation of the Ho3+-Ho 3 § dimers in forsterite during the process of crystal growth. We suppose [25] that these mechanisms resulting in charge compensation of heterovalent dissolution of h0lmium in forsterite are similar to those which are responsible for the formation of dimer centers of trivalent 3d ions in forsterite and bromides [16,[27][28][29]. In this case the formation of the associates [Ho3+-VMg-HO 3+] takes place (here VMg is a vacancy of Mg2+).…”

Section: Discussionmentioning

confidence: 99%

“…Asa rule, these associates have zero effective formal charge in respect to the host lattice. There were observed, in particular, the associates formed by two Cr 3+ ions in the M1 sites with a Mg 2+ vacancy between them instead of three adjacent Mg 2+ ions located in the above mentioned quasi-one-dimensional chain of magnesium positions MI in forsterite [16]. ions in the MI or M2 sites, and A13+ in the tetrahedral site, the nearest one to the impurity Cr 3+ [17].…”

Section: Introductionmentioning

confidence: 99%

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Multifrequency EPR spectroscopy of Ho3+ ions in synthetic forsterite

et al. 2005

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Electron paramagnetic resonance (EPR) of |1o 3 § single ions and llo3'-Mg-"-vacancy-llo 3' associates in holmium-doped forsterite single crystals are studied at 9.4, 37.3 and 65-250 Gtlz. Crystals were grown from melt by the Czochralski technique in slightly oxidizing atmosphere. For both centers, directions of the principal magnetic axes and parameters of the effective spin Hamiltonians describing dependences of electron-nuclear levels on applied magnetic field are obtained. For [lo s' substituting Mg"" in the M2 site as the single ion and for Ho "~" ions in dimer centers, values of crystal field parameters related to a real crystal lattice structure are estimated in the framework of the exchange charge model. The calculated crystal field energies, values of the g-factors of the ground I-[o 3~ quasi-doublet and the directions of the corresponding magnetic moments agree satisfactorily with the data obtained from measurements of EPR and optical absorption and site-selective luminescence spectra. I IntroductionForsterite (Mg2SO4) is a member of family of olivines (Mg.~ej_x)2SiO 4, one of the widespread rock-forming minerals. Nowadays the interest to forsterite single crystals is related also with the efficient tunable laser oscillation of chromiumdoped forsterite, obtained to the moment in different regimes, including continious-wave oscillation [1, 2] and femtosecond pulse generation [3].A unir cell of forsterite crystalline structure (the lattice constants equal a = 0.4753, b = 1.019, c = 0.5988 nm) contains 4 formula units and has an orthorhombic symmetry with a space group Pbnm. The idealized olivine structure consists of a hexagonal close-packed array of oxygen anions, between which the octahedral and tetralaedral holes are located. One hall of those octahedral holes are occupied by Mg -'+ cations and 1/4 of tetrahedral holes are occupied

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multifrequency EPR spectroscopy of Ho3+ ions in synthetic forsterite

et al. 2005

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“…Several Cr 3C centers were studied by EPR in detail at X-band 8 -10 and at frequencies 65-85 GHz. 11 EPR signals of Cr 2C were observed presumably at X-band. 12 To the best of our knowledge, there is only one publication 13 devoted to studying Cr 2C : Mg 2 SiO 4 by tunable, highfrequency EPR spectroscopy.…”

Section: Methodsmentioning

confidence: 96%

Peculiar manifestation of the dipole-dipole interaction between non-Kramers paramagnetic centers as studied by tunable high-frequency EPR spectroscopy

Salikhov

Tarasov

2005

Magn. Reson. Chem.

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EPR spectral shape of non-Kramers paramagnetic centers (PCs) is theoretically analyzed under conditions of saturation. The analysis is performed in a model that includes the spectral diffusion process induced by a random modulation of the dipole-dipole interaction of the paramagnetic centers, by reorientations of magnetic moments. It is shown that around zero magnetic field, a 'hole' might appear in the EPR spectrum. We have also studied experimentally the saturation behavior of the EPR spectrum in Cr2+: Mg2SiO4. The experimental results are interpreted in the framework of the model considered. By comparing simulated and experimental spectra, the paramagnetic relaxation times and the characteristic rate of the spectral diffusion are estimated.

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“…Experimental observations have revealed that trivalent chromium ions can exist not only in the isolated form but also as associates with magnesium vacancies [31,32]. Tetravalent chromium ions substitute for silicon ions in tetrahedral sites.…”

Section: Forsteritementioning

confidence: 99%

Growth of Oxide Laser Crystals by Czochralski Method

et al. 2013

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The growth of series of actual laser crystals belonging to dierent structural types by the Czochralski method is presented. The primary attention is given to single crystalline compounds and their solid solutions with garnet structure (scandium-containing rare-earth garnets with general formula {LnSc}3[ScMe]2Me3O12, Me = Al, Ga) as well as with olivine (forsterite Mg2SiO4) and scheelite structure (double tungstates and molybdates with formula NaLn(TO4)2, where T = Mo or W). The broad bands of luminescence and absorption produced by activator ions in these laser hosts that appear either as a result of structural disorder (garnets, scheelites) or due to the doping by transition metal ions (chromium in forsterite) join together these representatives of dierent structural classes and determine their application in photonics. The paper considers the problems of growing of large crystals with uniform distribution of components and dopants, determination of congruently melting composition, especially in compounds with complex isomorphism. The mutual inuence of components and dopants, redistribution of ions along crystallographically non-equivalent sites in the structure, alteration of valency of transition metal ions accompanied with the change of their segregation coecients under variation of redox conditions is discussed.

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High-frequency tunable EPR spectroscopy of Cr3+ in synthetic forsterite

Cited by 21 publications

References 18 publications

Multifrequency EPR spectroscopy of Ho3+ ions in synthetic forsterite

Multifrequency EPR spectroscopy of Ho3+ ions in synthetic forsterite

Peculiar manifestation of the dipole-dipole interaction between non-Kramers paramagnetic centers as studied by tunable high-frequency EPR spectroscopy

Growth of Oxide Laser Crystals by Czochralski Method

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