Preparation and characterization of lead and zinc tellurite glasses

Effect of natural Fe3O4 nanoparticles on structural and optical properties of Er3+ doped tellurite glass

“…The optical absorption coefficient a(n) as function of photon energy hn can be expressed using the Davis and Mott equation in order to determine the optical band gap energy E opt [1,16] aðvÞ ¼…”

“…When an incident photon on the materials has energy less than band gap energy of the materials, the increasing absorption coefficient is followed with an exponential decay of state density localized into the gap [13]. The lack of crystalline long-range order in amorphous or glassy materials is associated with a tailing of states density into normally forbidden energy [1,18].…”

“…Tellurite glasses are one of the very promising optical materials for lasers and nonlinear applications due to its high refractive index, low phonon maxima and low melting temperatures [1]. In addition, the nonlinear optical properties of these glasses are suitable for photonic applications such as optical modulators and memories.…”

Effects of Al3+, W6+, Nb5+ and Pb2+ on the structure and properties of borotellurite glasses

“…The preparation of pure TeO 2 glass is difficult as it requires very high quenching rate of~10 5 Ks −1 that is normally achieved by twin roller quenching methods [6,7]. The glass forming ability of TeO 2 increases considerably on mixing it with other glass formers such as B 2 O 3 , P 2 O 5 and SiO 2 or by adding network modifiers such as PbO, ZnO, WO 3 , Nb 2 O 5 , alkali and alkaline earth metal oxides [8][9][10].…”

“…Structural studies of leadtellurite glasses based on Raman spectroscopy reveal that TeO 3 structural units tend to dominate the glass structure with increasing PbO concentration; thus, PbO act as a network modifier that depolymerizes the tellurite network. Also, non-bridging oxygens progressively break Te-O-Pb linkages existing in the network as more and more PbO is added [9,21,22]. Lead glasses find application as radiation shielding materials.…”