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首页> 外文期刊>Journal of Crystal Growth >Composition and shape control of single-crystalline Ba_(1-x)Sr_xTiO_3 (x = 0-1) nanocrystals via a solvothermal route
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Composition and shape control of single-crystalline Ba_(1-x)Sr_xTiO_3 (x = 0-1) nanocrystals via a solvothermal route

机译：溶剂热途径制备单晶Ba_（1-x）Sr_xTiO_3（x = 0-1）纳米晶体的组成和形状控制

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摘要

Single-crystalline and well-dispersed barium strontium titanate (Ba_(1-x)Sr_xTiO_3, x = 0-1, BST) nanocrystals have been successfully synthesized in a shape- and composition-controlled manner using a facile solvothermal route. The microstructure and composition of the as-synthesized samples were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and energy-dispersive X-ray spectroscopy (EDX). All the samples were identified as cubic perkovsite phase by XRD. The average particle sizes, morphologies and compositions of all the as-synthesized samples significantly depend on the Ba/Sr molar ratio in the initial reactants. The particle size gradually increases and the morphology ranges from irregular sphere to cube as the strontium proportion increases in the BST. It has also been found that, in all cases, strontium is more readily incorporated into the BST nanocrystals compared with barium. Further experiments display that highly dispersed BaTiO_3 and SrTiO_3 nanocrystals could also be obtained with an acceptable crystallinity at room temperature by this solvothermal method.
机译：单晶和良好分散的钛酸锶钡（Ba_（1-x）Sr_xTiO_3，x = 0-1，BST）纳米晶体已使用方便的溶剂热途径成功地以形状和成分控制的方式合成。通过X射线衍射（XRD），透射电子显微镜（TEM），高分辨率TEM（HRTEM）和能量色散X射线光谱（EDX）研究了合成样品的微观结构和组成。 XRD将所有样品鉴定为立方晶过孔相。所有合成样品的平均粒径，形貌和组成都极大地取决于初始反应物中的Ba / Sr摩尔比。随着BST中锶比例的增加，粒径逐渐增加，形态从不规则球体变为立方体。还已经发现，在所有情况下，与钡相比，锶更容易掺入到BST纳米晶体中。进一步的实验表明，通过该溶剂热法，在室温下也可以获得具有可接受的结晶度的高度分散的BaTiO_3和SrTiO_3纳米晶体。

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