TITLE:
Optical Basicity and Polarizability of Nd3+-Doped Bismuth Borate Glasses
AUTHORS:
Beena Bhatia, S. L. Meena, Vishal Parihar, Monika Poonia
KEYWORDS:
Neodymium Based Glass, Optical Basicity, Polarizability, Metallization Criterion
JOURNAL NAME:
New Journal of Glass and Ceramics,
Vol.5 No.3,
June
29,
2015
ABSTRACT: This paper reports on different physical and optical properties of Nd3+-doped bismuth borate
glasses. The glasses containing Nd3+ in (25 - x)Bi2O3:20Li2O:20ZnO:35B2O3:xNd2O3 (where x = 1,
1.5, 2 mol%) have been prepared by melt-quenching method. The amorphous nature of the glasses
was confirmed by X-ray diffraction studies. The physical parameters like dielectric constant, refractive
index, ionic concentration, oxygen-packing density, inter ionic distance, polaronradius,
reflection loss, energy gap, molar refractivity, molar polarizability, electronic polarizability, optical
basicity and field strength are computed. On the basis of the measured values of the density
and refractive index, the Nd3+ ion concentration in glasses, the polarizability of oxide ions and
optical basicity were theoretically determined. The theoretical value of average electronic polarizability
and oxide ion polarizability were calculated by using Lorentz-Lorenz formula. Theoretical
optical basicity of the glasses is evaluated based on equation proposed by Duffy and Ingram. The
metallization criterion has also been calculated on the basis of refractive index and energy gap.
The large value of metallization criterion indicates that the glass materials are insulators. The results
obtained predict the nature of bonding in the present glasses and provide basis for developing
new nonlinear optical material.