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首页> 外文期刊>Crystal growth & design >Reactions during Electrochemically Induced Nucleation of Mullite from a MgO/Al_2O_3/TiO_2/SiO_2/B_2O_3/CaO Melt
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Reactions during Electrochemically Induced Nucleation of Mullite from a MgO/Al_2O_3/TiO_2/SiO_2/B_2O_3/CaO Melt

机译：MgO / Al_2O_3 / TiO_2 / SiO_2 / B_2O_3 / CaO熔体电化学诱导莫来石成核过程中的反应

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摘要

Glasses with the composition 52.6 SiO_2·18.7 Al_2O_3·14.3 MgO·7.7 TiO_2·4.7 B_2O_3·2.0 CaO were crystallized using electrochemically induced nucleation at temperatures from 1200 to 1400 °C. The crystals grew with their fastest growing axis pointing away from the surface of the electrode. At the cathode, Ti~(4+) is reduced to Ti~(3+), which was proved by EPR and UV?vis?NIR spectroscopy. The silicate network is also reduced to elemental silicon to a small extent and forms an alloy with the platinum cathode. The higher coordination number of Ti~(3+) should lead to a drop in viscosity due to its role as a glass modifier and, hence, fully explains the nucleation. The orientations of three neighboring crystals were analyzed by electron backscatter diffraction (EBSD).
机译：使用电化学诱导的成核在1200至1400℃的温度下使组成为52.6 SiO_2·18.7 Al_2O_3·14.3 MgO·7.7 TiO_2·4.7 B_2O_3·2.0 CaO的玻璃结晶。晶体以其最快的生长轴指向电极表面生长。在阴极处，Ti〜（4+）还原为Ti〜（3+），这已通过EPR和UV-vis？NIR光谱证明。硅酸盐网络也少量还原为元素硅，并与铂阴极形成合金。 Ti〜（3+）的较高配位数应由于其作为玻璃改性剂的作用而导致粘度下降，因此可以充分解释成核现象。通过电子背散射衍射（EBSD）分析了三个相邻晶体的取向。

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