Thermal stability and crystallization behavior of TiO2 doped ZBLAN glasses

Abstract

ZBLAN glasses with the composition (in mol%) of (100 − x)(53 ZrF 4 +19 BaF 2 + 5LaF 3 +3AlF 3 +20NaF)+xTiO 2 (x = 0, 1.0 and 2.0 mol%) were prepared using a conventional melting technique in dry nitrogen atmosphere. The thermal stability, glass-forming ability, and crystallization kinetics of the ZBLAN system as a function of the TiO 2 concentrations were investigated by Differential Scanning Calorimetry (DSC). Also, the crystalline phases were determined by X-ray Diffraction (XRD). Our study indicates that adding TiO 2 in a fluoride system improves the thermal parameters of the glass, which is interesting for applications as optical fiber.

Glass forming ability and enhanced 2.7μm emission of erbium ions in TeO2 doped fluoroaluminate glass

“…Compared with AYF and ZBLAN [15] which did not have TeO 2 , these fluoroaluminatetellurite glasses had larger DT, S and c. At the same time, these three criterions agreed well with each other and it could be inferred that a suitable ratio of TeO 2 could improve vitrification ability of fluoroaluminate glass greatly. Table 1 Characteristic temperatures (T g , T x , T p , T m ) and DT, S, c of present glasses.…”

“…Some Te-O bonds could have been replaced by the Te-F bonds, and this indicated that weaker bonds are introduced into the system. For the concentration of TeO 2 , a notable change in T g was observed, and the change could be due to the higher average bond energy (the Te-O covalent bonds) [15].…”

“…The fluoride glass we used was fluoroaluminate glass and the TeO 2 doped fluoride glass with following compositions in mol%: 3,12,15,18).…”

“…The solid lines were the fits using the Kissinger method to determine the activation energy and frequency factor. 258 ± 4 3.14 Â 10 12±1 ZBLAN [15] 361 ± 4 * * There is no data about frequency factor in Ref. [15].…”

“…258 ± 4 3.14 Â 10 12±1 ZBLAN [15] 361 ± 4 * * There is no data about frequency factor in Ref. [15]. possible glass crystallization time was ðT m À T g Þ=b and the time from on-set crystallization to crystallization peak was ðT p À T x Þ=b.…”