Controlled Growth of Srx Ba1-x Nb2 O6 Hopper- and Cube-Shaped Nanostructures by Hydrothermal Synthesis.,Chemistry - A European Journal

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Controlled Growth of Srx Ba1-x Nb2 O6 Hopper- and Cube-Shaped Nanostructures by Hydrothermal Synthesis.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-03-03 , DOI: 10.1002/chem.202000373
Ola G Grendal ₁ , Inger-Emma Nylund ₁ , Anders B Blichfeld ₁ , Satoshi Tominaka ₂ , Koji Ohara ₃ , Sverre M Selbach ₁ , Tor Grande ₁ , Mari-Ann Einarsrud ₁

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Controlling the shape and size of nanostructured materials has been a topic of interest in the field of material science for decades. In this work, the ferroelectric material Sr_xBa_1−xNb₂O₆ (x= 0.32–0.82, SBN) was prepared by hydrothermal synthesis, and the morphology is controllably changed from cube‐shaped to hollow‐ended structures based on a fundamental understanding of the precursor chemistry. Synchrotron X‐ray total scattering and PDF analysis was used to reveal the structure of the Nb‐acid precursor, showing Lindqvist‐like motifs. The changing growth mechanism, from layer‐by‐layer growth forming cubes to hopper‐growth giving hollow‐ended structures, is attributed to differences in supersaturation. Transmission electron microscopy revealed an inhomogeneous composition along the length of the hollow‐ended particles, which is explained by preferential formation of the high entropy composition, SBN33, at the initial stages of particle nucleation and growth.

中文翻译：

通过水热合成控制 Srx Ba1-x Nb2 O6 漏斗形和立方形纳米结构的生长。

几十年来，控制纳米结构材料的形状和尺寸一直是材料科学领域感兴趣的话题。本工作通过水热合成法制备了铁电材料Sr _x Ba _{1− x} Nb ₂ O ₆ ( x= 0.32–0.82, SBN)，其形貌可控地从立方体结构转变为空心结构。对前体化学有基本的了解。同步加速器 X 射线全散射和 PDF 分析用于揭示 Nb 酸前体的结构，显示出类似 Lindqvist 的图案。不断变化的生长机制，从逐层生长形成立方体到料斗生长产生空心结构，归因于过饱和度的差异。透射电子显微镜显示，沿空心颗粒长度方向的成分不均匀，这可以通过在颗粒成核和生长的初始阶段优先形成高熵成分 SBN33 来解释。

更新日期：2020-03-03

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