Evidence of Strong Correlation Between Local Structures in Glass and Crystalline Phase of Lanthanum Tellurite System

Structural models are reported for lanthanum tellurite glasses, (La2O3)(x) - (TeO2)(1-x)(x = 0.05, 0.10, 0.15, 0.20) usingtotal neutron diffraction measurements, Raman spectroscopy and neutron powder diffraction onrecrystallized glasses. Reverse Monte Carlo modeling of total diffraction data has been used to build 3D configurations for all the glasses to understand the correlation between glass network and crystalline structure. The average coordination number and bond angle distributions have been obtained and compared as a function of lanthanum concentration. We observed that the local structure of the glasses has good resemblance to the short range order of corresponding crystalline phase and the network connectivity in the glasses can be linked to that of the distorted crystalline structure which is basically the origin of anti-glass phase.