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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Accepted Paper
Spectroscopic Investigations of Mn2+ Doped B2O3-ZnO-Bi2O3 Glasses
Bejjipurapu Chandrasekhar1, Satyanarayana Talam2, Ramesh Sopinti2, Nagarjuna Gunnam3, Rajeswara Rao Darsi4, G. Bhanu Kiran5, B.V. Raghavaiah6
1Department of Physics, Acharya Nagarjuna University-522510, Guntur, Andhra Pradesh, India
2Department of ECE, Lakireddy Bali Reddy College of Engineering (Autonomous), Mylavaram-521230, NTR District, Andhra Pradesh, India
3Department of Chemistry, Government Degree College, Avanigadda-521121, Krishna District, Andhra Pradesh, India
4Department of Physics, Government Junior College, Tiruvuru-521235, Andhra Pradesh, India
5Department of Mechanical Engineering, RGUKT-Nuzvid Campus, Rajiv Gandhi University of Knowledge Technologies-Andhra Pradesh, Nuzvid, 521201, Andhra Pr
6Department of Physics, RGUKT - Ongole Campus, Rajiv Gandhi University of Knowledge Technologies-Andhra Pradesh, Ongole, 523001, Andhra Pradesh, India
go back1Department of Physics, Acharya Nagarjuna University-522510, Guntur, Andhra Pradesh, India
2Department of ECE, Lakireddy Bali Reddy College of Engineering (Autonomous), Mylavaram-521230, NTR District, Andhra Pradesh, India
3Department of Chemistry, Government Degree College, Avanigadda-521121, Krishna District, Andhra Pradesh, India
4Department of Physics, Government Junior College, Tiruvuru-521235, Andhra Pradesh, India
5Department of Mechanical Engineering, RGUKT-Nuzvid Campus, Rajiv Gandhi University of Knowledge Technologies-Andhra Pradesh, Nuzvid, 521201, Andhra Pr
6Department of Physics, RGUKT - Ongole Campus, Rajiv Gandhi University of Knowledge Technologies-Andhra Pradesh, Ongole, 523001, Andhra Pradesh, India
Abstract. A glass system of specific composition 55B2O3-20Bi2O3-(25-x)ZnO:xMnO (0.5 ≤ x ≤ 2.0 mol%) was synthesized by conventional melt quenching technique. Structural, morphological, optical absorption, photoluminescence (PL) and electron paramagnetic resonance (EPR) studies were carried out on the prepared sample. The XRD pattern of the glasses revealed the amorphous nature of the samples. SEM images indicated very few crystal grains in the samples, indicating the possible occurrence of crystallization during the annealing process. Differential thermal analysis (DTA) studies indicated a down trend in the rigidity of glass network associated with glass transition temperature. The bands corresponding to divalent and trivalent manganese ions were observed in UV-visible region. The emission spectra exhibited two characteristic bands in the regions around 510-560 nm and 610-650 nm corresponding to transitions of divalent manganese ions positioned in tetrahedral and octahedral symmetries. EPR showed the characteristic resonance signals of Mn2+ ions in all glass samples. The factors for increasing structural degree of disorder and occupying tetragonal and octahedral symmetry changes with the content of MnO were discussed.