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Influence of synthesis route on the morphology of SrTiO_3 particles

机译：合成路线对SrTiO_3颗粒形貌的影响

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摘要

The cubic perovskite SrTiO_3 is an important semiconductor oxide with a band gap of 3.2 eV. It has a wide variety of applications such as: dielectric materials, photoluminescent devices, and in photocatalysis. It is conventionally obtained by the classic solid state synthesis (SS), in which TiO_2 and SrCO_3 react for several hours at temperatures as high as 1200 ℃. Besides the high energy demand, SS is not useful for the control of physical characteristics, such as particle size and morphology, which has become essential for some of its applications. It is known that many soft and green routes can produce SrTiO_3. Among them, the hydrothermal (HT) and sol-precipitation (SP) methods, as well as the molten salt synthesis (MS) are interesting not only due to their low cost and energy use, but also because of the possibility of particle size and shape control. This study compares the size and morphology of the SrTiO_3 particles obtained by these three synthetic pathways. Scanning electron microscopy (SEM) was used to compare particle size and morphology, and X-ray diffraction (XRD) was used to confirm the perovskite formation as well as to determine the Scherrer's particle size.
机译：立方钙钛矿SrTiO_3是一种重要的半导体氧化物，其带隙为3.2 eV。它具有广泛的应用，例如：介电材料，光致发光器件以及光催化领域。它通常是通过经典的固态合成（SS）获得的，其中TiO_2和SrCO_3在高达1200℃的温度下反应数小时。除了高能量需求外，SS不能用于控制物理特性，例如粒度和形态，这对于其某些应用已变得至关重要。众所周知，许多柔软的绿色路线都可以产生SrTiO_3。其中，水热（HT）和溶胶沉淀（SP）方法以及熔融盐合成（MS）方法不仅令人关注，不仅因为其成本低廉，能耗低，而且还因为其粒径和粒径的可能性。形状控制。这项研究比较了通过这三种合成途径获得的SrTiO_3颗粒的大小和形态。使用扫描电子显微镜（SEM）来比较粒径和形态，并使用X射线衍射（XRD）确认钙钛矿的形成以及确定Scherrer的粒径。

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  • 会议地点 San Francisco CA(US)
  • 作者

    Marina M. Leite; Flavio M. Vichi;

  • 作者单位

    Instituto de Quimica, Universidade de Sao Paulo Av. Lineu Prestes, 748, Sao Paulo - SP, Brazil, 05508-000;

    Instituto de Quimica, Universidade de Sao Paulo Av. Lineu Prestes, 748, Sao Paulo - SP, Brazil, 05508-000;

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