Kesavulu, C R and Muralidhara, R S and Rao, J L and Anavekar, R V and Chakradhar, R P S (2009) EPR and photoluminescence studies on lithium-potassium borophosphate glasses doped with Mn(2+) ions. Journal of Alloys and Compounds, 486 (1-2). pp. 46-50. ISSN 0925-8388

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The mixed alkali borophosphate xLi(2)O-(30-x)K(2)O-35B(2)O(3)-34.5P(2)O(5) (5 <= x <= 25) glasses doped with 0.5 mol% of manganese ions have been studied using EPR and photoluminescence techniques. The EPR spectra of all the investigated samples exhibit resonance signals which are characteristic of Mn(2+) ions. The resonance signal with effective g value at g = 2.02 exhibits a six line hyperfine structure. The zero-field splitting parameter (D) at room temperature has been evaluated from the intensities of allowed hyperfine lines. The EPR spectra at different temperatures (123-295 K) have also been studied. It is found that the spin concentration (N) exhibits non-linear behaviour with composition showing the mixed alkali effect (MAE). From the EPR data, the paramagnetic susceptibility (chi) has been calculated at various temperatures. The Curie constant (C) and paramagnetic Curie temperature (theta(p)) have been evaluated from the 1/chi versus T graph. The photoluminescence (PL) spectrum exhibits a green emission band at 582 nm and this band has been assigned to a transition from the upper 4 T(1g) -> (6)A(1g) ground state of Mn(2+) ions.

Item Type: Article
Uncontrolled Keywords: Mn2+; Electron paramagnetic resonance (EPR); Photoluminescence;
Subjects: Glass
Engineering Materials
Depositing User: Ashok K Podder
Date Deposited: 21 Feb 2012 11:00
Last Modified: 21 Feb 2012 11:00

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