Optical and Physical Investigations of Lanthanum Bismuth Borate glasses doped with Ho2O3

International Conference on Advances in Materials and Manufacturing Applications 2017

Ramesh, P.^1,2 ; Jagannath, G.^1 ; Eraiah, B.^1 ; Kokila, M.K.^1

Department of Physics, Bangalore University, Bangalore, Karnataka

560056, India^1

Govt. College for Women, Kolar, Karnataka

563101, India^2

关键词: Bismuth borate glass;    Degree of disorder;    Field strengths;    Glass matrices;    Interionic distance;    Non-bridging oxygen;    Rare earth ions;    UV-VIS absorption spectra;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/310/1/012032/pdf
DOI  :  10.1088/1757-899X/310/1/012032

来源: IOP

【 摘 要 】

Holmium doped 10La2O3-15Bi2O3-(75-x) B2O3(Ho3+: LBB) glasses have been prepared by melt quench technique and the impact of holmium ions concentration on optical and physical properties of present glasses have been examined. Ho3+dependent density, molar volume, refractive index, rare earth ion concentration, polaron radius, inter ionic distance, field strength and energy band gap are calculated and tabulated. Amorphous nature of the all glasses has been confirmed by XRD patterns. The room temperature (RT) Uv-Vis absorption spectrum doped with 1 mol% of Ho2O3exhibit eight prominent bands centred at 895, 641, 537, 486, 472, 467, 451 and 416 due to transition between ground state to various excited states. The results show that, the density is increases and molar volume of the glasses is decreases with an increase in Ho2O3concentration and consequently generate more non-bridging oxygen (NBOs) in the glass matrix. The Urbach energy is increases with holmium concentration which exemplifies the degree of disorder present in the LBB glasses. The considerable increase in field strength observed in present glasses is attributed to occurrence of strong bridge between Ho3+and B-ions and this strong bridge is possibly due to the displacement between Ho3+and oxygen atoms which are generated from the conversion BO3-BO4units.