title: Spectroscopic features of Ni(2+) ion in PbO-Bi2O3-SiO2 glass system.
abstract: Glasses of the composition (30-x)PbO-5Bi2O3-65SiO2: xNiO (with x ranging from 0 to 1.0 mol%) were synthesized. A variety of spectroscopic studies, viz., IR, Raman optical absorption and luminescence properties of these glasses have been carried out as a function of NiO concentration. The analysis of results of all these studies has indicated that the nickel ions occupy both octahedral and tetrahedral positions. However, with the increase of NiO concentration the octahedral occupancy of Ni(2+) ions prevailed over the tetrahedral ions. The luminescence spectra of these glasses have exhibited a broad NIR emission band in region 1100-1500 nm. This band is identified as being due to (3)T2(3F)→(3)A2(3F) octahedral transition of Ni(2+) ions. The luminescence efficiency and cross section have been found to be the highest for the glass containing the highest concentration of NiO. The reasons for such high luminescence efficiency have been discussed in the light of structural variations taking place in the host glass network.
authors: Department of Physics, Univ. College of Engg and Technology, Acharya Nagarjuna University, Nagarjuna Nagar 522510, A.P., India.
authors: B
authors: B
authors: Suresh
authors: Department of Physics, Univ. College of Engg and Technology, Acharya Nagarjuna University, Nagarjuna Nagar 522510, A.P., India. Electronic address: msreddy81@rediffmail.com.
authors: M
authors: M
authors: Srinivasa Reddy
authors: Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar 522510, A.P., India.
authors: A
authors: A
authors: Siva Sesha Reddy
authors: Department of Physics, Kakani Venkata Ratnam College, Nandigama 521185, A.P., India.
authors: Y
authors: Y
authors: Gandhi
authors: Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar 522510, A.P., India.
authors: V
authors: V
authors: Ravi Kumar
authors: Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar 522510, A.P., India.
authors: N
authors: N
authors: Veeraiah
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013696:Temperature
chemical_list: D010087:Oxides; D007854:Lead; C047365:lead oxide; D012822:Silicon Dioxide; D009532:Nickel; C033301:bismuth oxide; D001729:Bismuth
keywords: Bismuth silicate glasses; Nickel ions; Spectroscopic studies