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Effect of TiO2 on the optical, structural and crystallization behavior of barium borate glasses

机译：TiO2对硼酸钡玻璃的光学，结构和结晶行为的影响

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Collective characterizations of prepared binary barium borate glass (50 mol % BaO - 50 mol % B2O3) together with samples containing increasing added TiO2 contents (5% -> 30%) were carried out by optical and FT infrared absorption measurements. FT infrared and X-ray diffraction analysis were done for heat treated glass - ceramic derivatives prepared through two step regime process. Optical spectra of the glasses reveal the presence of titanium ions mainly in the tetravalent state imparting additional UV band beside strong UV absorption due to trace iron impurity. IR spectral studies indicate the presence of triangular and tetrahedral borate groups through the modification of BaO to some BO3 to BO4 groups beside the presence of titanium ions as interfering or overlapping TiO4 or B-O-Ti groupings in the glassy network. Crystalline X-ray diffraction results indicate the separation of crystalline barium borate of the composition (2Ba0.5 B2O3) as a main constituent together with some crystalline alkali titanates confirming the role of TiO2 of both as nucleating agent beside acting as structural forming through reaction with alkali oxides to form crystalline titanates. The optical band gap values reveal progressive decrease and increase of Urbach energy with TiO2 content and the same for the refractive index values and all these parameters are correlated with the proposed changes in the glass constitution with the introduction of TiO2. The additional thermal expansion measurements indicate the peculiar characteristic negative expansion up to 300 degrees C and after which an increase in the coefficient of thermal expansion is identified with the increase in temperature. The thermal parameters are also correlated with the modification of the glass structure by the introduction of titanium ions. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过光学和FT红外吸收测量，对制得的二元硼酸钡玻璃（50 mol％BaO-50 mol％B2O3）以及含有增加的TiO2含量（5％-> 30％）的样品进行了集体表征。 FT红外和X射线衍射分析是对经过两步法制得的热处理玻璃-陶瓷衍生物进行的。玻璃的光谱表明，钛离子主要以四价态存在，除了由于痕量铁杂质引起的强紫外线吸收外，还赋予了额外的紫外线带。红外光谱研究表明，通过将BaO修饰为一些BO3至BO4基团，存在三角形和四面体硼酸盐基团，此外在玻璃网络中存在钛离子作为干扰或重叠的TiO4或B-O-Ti基团。结晶X射线衍射结果表明，分离出以主要成分组成的组合物（2Ba0.5 B2O3）的结晶硼酸钡和一些结晶的碱金属钛酸盐，这证实了TiO2既作为成核剂，又通过与硅酸反应起结构形成的作用。碱金属氧化物形成结晶钛酸盐。光学带隙值显示随着TiO2含量的增加，Urbach能量逐渐减小和增加，并且折射率值也相同，所有这些参数都与引入TiO2时玻璃结构的变化有关。附加的热膨胀测量值表明，直到300摄氏度时，它的特性都为负膨胀，此后，随着温度的升高，热膨胀系数也随之增加。通过引入钛离子，热参数也与玻璃结构的改变相关。 （C）2016 Elsevier B.V.保留所有权利。

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