Boson peak preservation in tellurite glasses polymorphism

Abstract

Tellurite glasses exhibit the well-known Boson peak at low frequency, which is attributed to the vibration of transversal modes. A similar signature is observed when crystallizing from a full and congruent manner a parent glass leading to translucent or transparent anti-glass or ceramic polymorphs. However, in those disordered crystalline polymorphs, both transversal and longitudinal modes are observed. Such results were confirmed in two tellurite glass systems, namely the TeO2–Nb2O5–Bi2O3 (TNB) and the TeO2–Ta2O5–Bi2O3 (TTB) by Raman spectroscopy, which generate different Raman spectroscopy lineshape. These unprecedented results validate a large part of the theory already developed by other authors and paves the way to new technological applications.