Tin titanate—the hunt for a new ferroelectric perovskite

IF 19 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Reports on Progress in Physics Pub Date : 2019-06-07 DOI:10.1088/1361-6633/ab37d4
J. Gardner, Atul Thakre, Ashok Kumar, J. Scott
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引用次数: 11

Abstract

We review all the published literature and show that there is no experimental evidence for homogeneous tin titanate SnTiO3 in bulk or thin-film form. Instead a combination of unrelated artefacts are easily misinterpreted. The x-ray Bragg data are contaminated by double scattering from the Si substrate, giving a strong line at the 2θ angle exactly where perovskite SnTiO3 should appear. The strong dielectric divergence near 560 K is irreversible and arises from oxygen site detrapping, accompanied by Warburg/Randles interfacial anomalies. The small (4 µC cm−2) apparent ferroelectric hysteresis remains in samples shown to be pure (Sn,Ti)O2 rutile/cassiterite, in which ferroelectricity is forbidden. Only very recent work reveals real bulk SnTiO3, but it possesses an ilmenite-like structure with an elaborate array of stacking faults, not suitable for ferroelectric devices. Unpublished TEM data reveal an inhomogeneous SnO layered structured thin films, related to shell–core structures. The harsh conclusion is that there is a combination of unrelated artefacts masquerading as ferroelectricity in powders and ALD films; and only a trace of a second phase in PLD film data suggests any perovskite content at all. The fact that x-ray, dielectric, and hysteresis data all lead to the wrong conclusion is instructive and reminds us of earlier work on copper calcium titanate (a well-known boundary-layer capacitor).
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钛锡——寻找一种新的铁电钙钛矿
我们回顾了所有已发表的文献,并表明没有实验证据表明钛酸锡SnTiO3是均匀的块状或薄膜形式。相反,不相关的工件的组合很容易被误解。x射线Bragg数据受到来自Si衬底的双重散射的污染,在钙钛矿SnTiO3应该出现的2θ角处给出了一条强线。560k附近的强介电散度是不可逆的,由氧位脱聚引起,伴有Warburg/Randles界面异常。在纯(Sn,Ti)O2金红石/锡石样品中,铁电性仍然很小(4µC cm−2)。直到最近的研究才揭示了真正的块状SnTiO3,但它具有钛铁矿样的结构,具有复杂的堆叠断层阵列,不适合用于铁电器件。未发表的透射电镜数据揭示了非均匀的SnO层状结构薄膜,与壳核结构有关。严酷的结论是,在粉末和ALD薄膜中有不相关的伪影伪装成铁电性;在PLD薄膜数据中,只有微量的第二相表明有钙钛矿含量。x射线、介电和迟滞数据都得出了错误的结论,这一事实具有指导意义,并使我们想起了早期关于钛酸铜钙(一种著名的边界层电容器)的工作。
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来源期刊
Reports on Progress in Physics
Reports on Progress in Physics 物理-物理:综合
CiteScore
31.90
自引率
0.00%
发文量
45
审稿时长
6-12 weeks
期刊介绍: Reports on Progress in Physics is a highly selective journal with a mission to publish ground-breaking new research and authoritative invited reviews of the highest quality and significance across all areas of physics and related areas. Articles must be essential reading for specialists, and likely to be of broader multidisciplinary interest with the expectation for long-term scientific impact and influence on the current state and/or future direction of a field.
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