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首页> 外文期刊>Advanced Functional Materials >Studies on the reorganization of extended defects with increasing n in the perovskite-based La4Srn-4TinO3n+2 series
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Studies on the reorganization of extended defects with increasing n in the perovskite-based La4Srn-4TinO3n+2 series

机译：钙钛矿基La4Srn-4TinO3n + 2系列中随着n的增加缺陷扩展缺陷的重组研究

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Perovskite titanates with nominal stoichiometry ABO(3+delta) often exhibit quite interesting properties, but their structural characterization is not always rigorous. Herein, we demonstrate how excess oxygen can be incorporated in a titanate perovskite based lattice. A new family of layered perovskites La4Srn-4TinO3n+2 has been investigated by means of X-ray diffraction neutron diffraction transmission electron microscopy, thermogravimetric analysis, and density and magnetic measurements. Such layered perovskites are known to be able to accommodate extra oxygen beyond the parental ABO(3) perovskite in crystallo-graphic shears. The structure evolves with increasing n. Firstly, the perovskite blocks become more extensive an the oxygen intergrowth layers move further apart; then the spacing between the intergrowth layers increases further and their repetition becomes more sporadic. Finally the layered structure is lost for the n = 12 member (La2Sr4Ti6O19-delta). In this structure, excess oxygen is accommodated within the perovskite framework in randomly distributed short-range linear defects. These defects become more dilute as the cubic perovskite, that is, n = infinity, composition is approached.
机译：标称化学计量比为ABO（3 + delta）的钙钛矿钛酸盐通常表现出非常有趣的特性，但其结构表征并不总是严格的。在本文中，我们证明了多余的氧如何结合到钛酸钙钛矿基晶格中。通过X射线衍射中子衍射透射电子显微镜，热重分析以及密度和磁测量，研究了层状钙钛矿La4Srn-4TinO3n + 2的新家族。已知这种层状钙钛矿在晶体剪切机中能够容纳超过母体ABO（3）钙钛矿的额外氧气。结构随着n的增加而演化。首先，钙钛矿块变得更广泛，氧共生层进一步分开。然后，共生层之间的间隔进一步增加，并且它们的重复变得更加零星。最后，对于n = 12的成员（La2Sr4Ti6O19-delta），失去了分层结构。在这种结构中，过量的氧被容纳在钙钛矿骨架内的随机分布的短程线性缺陷中。随着立方钙钛矿（即n =无穷大）的接近，这些缺陷变得更加稀薄。

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