Chemistry, growth kinetics, and epitaxial stabilization of Sn2+ in Sn-doped SrTiO3 using (CH3)6Sn2 tin precursor
Chemistry, growth kinetics, and epitaxial stabilization of Sn2+ in Sn-doped SrTiO3 using (CH3)6Sn2 tin precursor
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DOI：
10.1063/1.4972995
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发表时间：
2016-12
期刊：
影响因子：
6.1
通讯作者：
Tianqi Wang;K. Pitike;Yakun Yuan;S. Nakhmanson;V. Gopalan;B. Jalan
中科院分区：
文献类型：
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作者：
Tianqi Wang;K. Pitike;Yakun Yuan;S. Nakhmanson;V. Gopalan;B. Jalan
PbTiO_3基铁电材料具有显著的电活性，其电活性来源于Pb 2 + 6s 2电子孤对，由于赝Jahn-Teller效应，导致了大的弹性形变和电极化。最近，含有Sn 2+和类似于6s 2孤对的化学的锡基钙钛矿氧化物（SnTiO 3）已被确定为PbTiO 3基铁电体的热稳定的、环境友好的替代物。然而，到目前为止，将Sn 2+稳定在钙钛矿ATiO 3的A位上的实验尝试失败了。在这项工作中，我们报告的原子光滑，外延，和连贯的Sn合金SrTiO 3薄膜的生长SrTiO 3（001）衬底上使用混合分子束外延方法。Sn（Sr+Ti+Sn）的离面晶格常数随Sn浓度的增加先按Vegard定律增大后减小。%比> 0.1，这是由于在A位点掺入了Sn 2+。使用高分辨率X射线光电组合...
PbTiO3-based ferroelectrics have impressive electroactive properties, originating from the Pb2+ 6s2 electron lone-pair, which cause large elastic distortion and electric polarization due to cooperative pseudo Jahn-Teller effect. Recently, tin-based perovskite oxide (SnTiO3) containing Sn2+ and a chemistry similar to that of the 6s2 lone-pair has been identified as a thermally stable, environmentally friendly substitute for PbTiO3-based ferroelectrics. However experimental attempts to stabilize Sn2+ on the A-site of perovskite ATiO3 have so far failed. In this work, we report on the growth of atomically smooth, epitaxial, and coherent Sn-alloyed SrTiO3 films on SrTiO3 (001) substrates using a hybrid molecular beam epitaxy approach. With increasing Sn concentration, the out-of-plane lattice parameter first increases in accordance with the Vegard’s law and then decreases for Sn(Sr+Ti+Sn) at. % ratio > 0.1 due to the incorporation of Sn2+ at the A-site. Using a combination of high-resolution X-ray photoelectr...