EPR and optical absorption spectral studies of Cr3+ ions doped in nickel maleate tetrahydrate single crystals

Gopal, N.O.; Narasimhulu, K.; Sunandana, C. S.; Rao, J.L.

doi:10.1016/j.physb.2003.12.008

Cited by 25 publications

(5 citation statements)

References 28 publications

(33 reference statements)

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“…We calculated the value of 10Dq/B to analyze the level of crystal field energy, where Dq and B are crystal field splitting parameter and Racah parameters, respectively. These two parameters can be calculated by the following equations [5] :…”

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confidence: 99%

Single crystal β-Ga2O3: Cr grown by floating zone technique and its optical properties

Zhang

夏长泰

et al. 2007

SCI CHINA SER E

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β-Ga 2 O 3 : Cr single crystals were grown by floating zone technique. Absorption spectra and fluorescence spectra were measured at room temperature. The values of field splitting parameter Dq and Racah parameter B were obtained by the peak values of absorption spectra. The value 10Dq/B=23.14 manifests that in β-Ga 2 O 3 crystals Cr 3+ ions are influenced by low energy crystal field. After high temperature annealing in air, the Cr 3+ intrinsic emission was enhanced and the green luminescence disappeared. The strong and broad 691 nm emission was obtained at 420 nm excitation due to the electron transition occurred from 4 T 2 to 4 A 2 . The studies manifest that the β-Ga 2 O 3 crystals have the potential application for tunable laser.β-Ga 2 O 3 : Cr single crystals, floating zone technique, tunable laser, spectrum.β-Ga 2 O 3 single crystal belongs to the monoclinic system with space group C2/m, and the lattice parameters are a=12.23 Å, b=3.04 Å and c=5.80 Å, β=103.83°. The crystal structure is composed of distorted [GaO 4 ] tetrahedra and [GaO 6 ] octahedra. An octahedron shares edges with adjacent octahedra composing double octahedral chains mainly parallel along b-axis of the lattice. A tetrahedron only shares corners with other tetrahedra and octahedra. By this way tetrahedron connects the two octahedral chains. β-Ga 2 O 3 single crystal is a semiconductor since free carriers can move along the octahedral chains. Many researchers focused on it due to its special UV properties among the transparent conducting oxides (TCO): The cutoff absorption edge of β-Ga 2 O 3 is shorter than any other TCOs, so it is transparent up to deep UV. In addition, β-Ga 2 O 3 single crystals are good GaN substrate due to their good chemical and mechanical properties [1] . How-

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confidence: 99%

Single crystal β-Ga2O3: Cr grown by floating zone technique and its optical properties

Zhang

夏长泰

et al. 2007

SCI CHINA SER E

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“…From Table 4, the experimental and theoretical band positions are seen to be reasonably consistent. Therefore the theoretical study of Cr 3+ ions at Li + sites in Li 2 SO 4 .H 2 Osupports the experimental one [11,36]. The spectra of optical absorption of Cr 3+ -activated phosphors have been explained using Franck-Condon analysis with the configurational-coordinate (CC) model [37].…”

Section: Calculations Of Crystal Field Parametersmentioning

confidence: 99%

“…Table 4 gives the energy values that were computed. The comparison of calculated energy values is done with the experimental energy values for Cr 3+ : NiMTH [36] having similar ligands as in Li 2 SO 4 .H 2 Osince no optical analysis of Cr 3+ in Li 2 SO 4 .H 2 O single crystal is reported in literature. From Table 4, the experimental and theoretical band positions are seen to be reasonably consistent.…”

Section: Calculations Of Crystal Field Parametersmentioning

confidence: 99%

Modeling of Cr3+ doped Single Crystals of Lithium Sulfate Monohydrate

Bharati,

Singh,

Kripal

2024

Mater. Plus

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Crystal field parameters and zero field splitting parameters of Cr3+ doped lithium sulphate monohydrate, Li2SO4.H2O single crystals are computed with the help of superposition model. The appropriate sites for Cr3+ ions in Li2SO4.H2O with distortion are considered for calculation. Theoretical zero field splitting parameters obtained including local distortion in the calculation correspond well with the values obtained from the experiment. The optical energy bands for Cr3+ in Li2SO4.H2Oare evaluated with the Crystal Field Analysis Program and crystal field parameters. The results suggest that Cr3+ ions substitute for one of the Li+ ions, and the charge compensation occurs by the proton vacancies in Li2SO4.H2O single crystals.

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“…where g e is the g-value of free electron (2.0023), l is the spin-orbit coupling constant (91 cm À1 [17]), D is the gap between the excited and ground levels and l eff is the spin-orbit coupling constant for Cr 3+ ion in the crystal [22]. From experimental values g ¼ 1.9741 and D ¼ 20 433 cm À1 , the value of a 0 is evaluated to be 0.7914.…”

Section: Article In Pressmentioning

confidence: 99%

EPR and optical absorption study of Cr3+-doped tetramethyl ammonium cadmium chloride single crystals

Kripal

Govind²,

Gupta

et al. 2006

Journal of Magnetism and Magnetic Materials

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EPR and optical absorption spectral studies of Cr3+ ions doped in nickel maleate tetrahydrate single crystals

Cited by 25 publications

References 28 publications

Single crystal β-Ga2O3: Cr grown by floating zone technique and its optical properties

Single crystal β-Ga2O3: Cr grown by floating zone technique and its optical properties

Modeling of Cr3+ doped Single Crystals of Lithium Sulfate Monohydrate

EPR and optical absorption study of Cr3+-doped tetramethyl ammonium cadmium chloride single crystals

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