EPR and magnetic susceptibility studies of Cu2+ ions in Bi2O3·GeO2 glasses

ions coupled by exchange interaction in a distorted octahedral environment. The EPR spectra at different temperatures (123-295 K) have also been studied. The intensity of the resonance signals decreases with increase in temperature whereas linewidth is found to be independent of temperature. The paramagnetic susceptibility (w) was calculated from the EPR data at various temperatures and the Curie constant (C) and paramagnetic Curie temperature (y p ) have been evaluated from the 1/w versus T graph. The optical absorption spectrum exhibits bands characteristic of Fe 3 + ions in octahedral symmetry. The crystal field parameter (Dq) and the Racah interelectronic repulsion parameters (B and C) have also been evaluated and discussed.

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“…The activation energy thus calculated is found to be 0.01 ev. This is of the same order as expected for a paramagnetic ion [42].…”

Section: Optical Absorption Studiessupporting

confidence: 70%

EPR and optical absorption studies of Fe3+ ions in sodium borophosphate glasses

Muralidhara

Kesavulu

Rao

et al. 2010

Journal of Physics and Chemistry of Solids

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“…(1)-(5), one obtains the following relations between EPR parameters and MO coefficients [23][24][25]: (a ,ß) 2 _ 5 dP (a^t ) 2 (S 11 ) 2 (9) xz xz where 0 = -K0(a 2 Pd + a" 2 Pp) (10) and P d,P 2yniioiin r 3/3d,4p i (11) ,un is the nuclear magneton; yn is the nuclear giromagnetic ratio; Pp d is the dipolar term (Pd = 0.036 cm-' and PP = 0.0402 cm -') [25]; Ad and A P are the spin-orbit coupling parameters for an electron in 3d or 4p orbital of free Cu 2 + (Ad = -828 cm -', A. = -925 cm -') [25].…”

Section: Discussionmentioning

confidence: 99%

“…It should be noticed that, apart from 6, the contact term, the largest contribution to A 11 and Al (Eqs. (8) and (9)) arises from the first term in each of the parentheses multiplied by P d and Ps,. Moreover the contribution from the p-type wave function has the effect of cancelling the contribution from the d-type wave function, for it always appears with the opposite sign.…”

Section: Discussionmentioning

confidence: 99%

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EPR studies of Cu2+ and V4+ ions in phosphate glasses

et al. 1999

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Two lead-phosphate glass systems doped with both copper and vanadium ions in different ratios were studied by EPR (electron paramagnetic resonance) method. EPR spectra and parameters (g = 2.44, gl = 2.08 and A 11 = 117.6. 10 4 cm') obtained for x(CuO • V 2 05)(1-x)[2P2O5 • PbO] glasses with x <-10 mol% suggest a tetrahedral (Td) coordination of Cu e+ ions and not a tetragonally elongated octahedron as has been assumed in previous works. The ground state of the paramagnetic electron is the dzy. copper orbital with a 4p, contribution of 6%. For 20 <-x <-40 mol% a broad line (AB = 307 G) characteristic for clustered ions appears at g = 2.18. The V°+ ions are evidenced only in the spectra of x(Cu0. 2V205)(1-x)[2P205 • PbO] glasses and the resonance parameters suggest a pentacoordinated C 4v local symmetry for these ions. The hyperfine structures characteristic for Cu e+ and V4 ions disappear for 10 -< x <_ 40 mol% due to the mixed exchange Cue'-V4 pair formation in these glasses.

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“…In the presence of the low symmetry component, the g value near to 2.0 is assigned to exchange coupled Cr 3+ ions based on Haouari et al's assignments [33]and on Ardelean et al [44], that explain the existence of Cr 5+ for lower concentrations of Cr 2 O 3 [45,46]. The signal that appears in the low magnetic field region at g ~ 4.8 is attributed to Fe 3+ ion impurities in the raw materials used in the preparation of the glass [44]. Hence, it is concluded in this study that Cr 3+ ions have distorted octahedral environments.…”

Section: Resultsmentioning

confidence: 99%

Structural Investigations of Cr3+ Ions Doped Alkali Lead Zinc Phosphate Glasses

Sastry¹

2015

IJIRSET

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Lead zinc phosphate glasses containing 0.1% transition metal ion Cr 3+ were prepared by melt quenching technique and their amorphous nature confirmed by X-Ray diffraction. The covalent bond nature of Cr 3+ ions with octahedral symmetry in glass network was established through Electron Paramagnetic Resonance and optical absorption spectroscopic studies. Endothermic dip for glass transition temperature (T g ) at about 410 0 C and an exothermic peak subsisted from thermal studies were obtained. De-polymerization of host glass network due to addition of alkali content to the glass matrix, has turned as a strong candidate for nonlinear optical laser applications.

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EPR and magnetic susceptibility studies of Cu2+ ions in Bi2O3·GeO2 glasses

Cited by 31 publications

References 20 publications

EPR and optical absorption studies of Fe3+ ions in sodium borophosphate glasses

EPR and optical absorption studies of Fe3+ ions in sodium borophosphate glasses

EPR studies of Cu2+ and V4+ ions in phosphate glasses

Structural Investigations of Cr3+ Ions Doped Alkali Lead Zinc Phosphate Glasses

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