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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Crystallisation,dielectric,polar and optical characteristics of Li_2B_4O_7-SrO-Bi_2O_3-Nb_2O_5 glasses and glass nanocomposites
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Crystallisation,dielectric,polar and optical characteristics of Li_2B_4O_7-SrO-Bi_2O_3-Nb_2O_5 glasses and glass nanocomposites

机译：Li_2B_4O_7-SrO-Bi_2O_3-Nb_2O_5玻璃和玻璃纳米复合材料的结晶，介电，极性和光学特性

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摘要

Glasses in the composition(100-x)Li_2B_4O_7.x(SrO-Bi_2O_3-Nb_2O_5)(10<=x<=60,in molar ratio)were prepared.The thermal stability factor(K_gl)was found to increase with increase in SBN composition.The activation energies involved for the crystal growth in the present study were calculated from basic Kissinger plots.The Avami parameter associated with the crystallisation events was found to be =3.The formation of nanocrystalline layered perovskite SrBi_2Nb_2O_9(SBN)phase via an intermediate fluorite phase was confirmed.The optical band gap and Urbach energy of the transparent glasses and glass nanocomposites(heat treated at 500 deg C)were found to be composition dependent.The samples that were heat treated at 550 deg C exhibited broad dielectric anomalies in the vicinity of ferroelectric to paraelectric transition temperature of the parent SBN ceramics.A shift in the phase transition temperature monitored via dielectric and pyroelectric measurements was observed with variation in SBN content.The incidence of pyroelectric and ferroelectric effects in the present composites confirmed their polar nature.
机译：制备组成为（100-x）Li_2B_4O_7.x（SrO-Bi_2O_3-Nb_2O_5）（摩尔比为10 <= x <= 60）的玻璃。发现热稳定性因子（K_gl）随着SBN的增加而增加。根据基本的Kissinger图计算了本研究中涉及晶体生长的活化能。发现与结晶事件有关的Avami参数为= 3。通过中间产物形成纳米晶层状钙钛矿SrBi_2Nb_2O_9（SBN）相。确认萤石相。发现透明玻璃和玻璃纳米复合材料（在500摄氏度下热处理）的光学带隙和Urbach能量与成分有关。在550摄氏度下热处理的样品在玻璃中呈现出广泛的介电异常。母体SBN陶瓷的铁电至顺电转变温度附近。观察到通过介电和热电测量监测的相变温度变化，并且SBN含量变化本发明复合物中热电和铁电效应的发生证实了它们的极性。

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