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首页> 外文期刊>Journal of Materials Science. Materials in Electronics >Effect of compositional changes on the structure and properties of alkali-alumino borosilicate glasses
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Effect of compositional changes on the structure and properties of alkali-alumino borosilicate glasses

机译：成分变化对碱金属铝硼硅酸盐玻璃结构和性能的影响

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The effect of replacing BaO by SrO or Al_(2)O_(3) by MgO on the structure and some physical properties of the glasses of the system Li_(2)O-B_(2)O_(3)-(SrO)BaO-(MgO)Al_(2)O_(3)-SiO_(2)--containing TiO_(2) have been investigated. Fourier transform infrared (FTIR) spectroscopy revealed that the addition of SrO at the expense of BaO gives no changes in the main structural building units. The addition of MgO instead of Al_(2)O_(3) decreases the fraction of BO_(3) and increases the fraction of BO_(4) groups. Dilatometric measurements showed that the thermal expansion coefficients (alpha-values) were increased by gradual addition of SrO or MgO instead of BaO or Al_(2)O_(3), respectively, however the transformation (T_(g)) and softening (T_(s)) temperature values of the glasses were decreased. The density was found to decrease as SrO/BaO or MgO/Al_(2)O_(3) replacements increased. The conductivity, dielectric constant and dielectric loss (dielectric constant X loss tangent) of the glasses were investigated using the frequency response in the interval 200 Hz-100 KHz and the effect of compositional change on the measured properties was investigated. Measurements showed that the electric responses of samples were different and complex. The addition of SrO instead of BaO generally, increases the conductivity, dielectric constant and dielectric losss of the glasses. Increasing the MgO at the expense of Al_(2)O_(3), the conductivity and dielectric constant of the glasses were decreased. However, the dielectric losss was increased. The electrical properties were found to be factors that are able to distinguish the various electrical parameters as a result of the change in composition. The obtained data were correlated to the internal structure of the glasses and the nature and role played by glass forming cations.
机译：Li_（2）O-B_（2）O_（3）-（SrO）BaO体系的SrO或MgO替代Al_（2）O_（3）或MgO替代BaO对玻璃结构和某些物理性能的影响研究了-（MgO）Al_（2）O_（3）-SiO_（2）-含TiO_（2）。傅里叶变换红外（FTIR）光谱显示，以BaO为代价添加SrO不会改变主要结构建筑单元。 MgO代替Al_（2）O_（3）的添加会减少BO_（3）的比例，并增加BO_（4）基团的比例。膨胀计测量表明，分别通过逐渐添加SrO或MgO而不是BaO或Al_（2）O_（3）来增加热膨胀系数（α值），但是转变（T_（g））和软化（T_ （s））眼镜的温度值降低。发现密度随着SrO / BaO或MgO / Al_（2）O_（3）替代物的增加而降低。使用200 Hz-100 KHz间隔内的频率响应，研究了玻璃的电导率，介电常数和介电损耗（介电常数X损耗角正切），并研究了成分变化对测量性能的影响。测量表明，样品的电响应不同且复杂。通常，添加SrO代替BaO会增加玻璃的电导率，介电常数和介电损耗。以Al_（2）O_（3）为代价增加MgO，玻璃的电导率和介电常数降低。但是，介电损耗增加了。发现电特性是由于成分变化而能够区分各种电参数的因素。获得的数据与玻璃的内部结构以及玻璃形成阳离子的性质和作用相关。

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