在 SrTiO 薄膜中，通过 T 增强到 >300°C，实现了非常高的换向品质因数和介电可调谐性。

Very high commutation quality factor and dielectric tunability in nanocomposite SrTiO thin films with T enhanced to >300 °C.

机构信息

Department of Materials Science and Metallurgy, University of Cambridge, UK.

出版信息

Nanoscale. 2018 Feb 15;10(7):3460-3468. doi: 10.1039/c7nr06991j.

DOI:10.1039/c7nr06991j

PMID:29446777

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5815283/

Abstract

We report on nanoengineered SrTiO-SmO nanocomposite thin films with the highest reported values of commutation quality factor (CQF or K-factor) of >2800 in SrTiO at room temperature. The films also had a large tunability of dielectric constant (49%), low tangent loss (tan δ = 0.01) and a Curie temperature for SrTiO > 300 °C, making them very attractive for tunable RF applications. The enhanced properties originate from the unique nanostructure in the films, with <20 nm diameter strain-controlling SmO nanocolumns embedded in a SrTiO matrix. Very large out-of-plane strains (up to 2.6%) and high tetragonality (c/a) (up to 1.013) were induced in the SrTiO. The K-factor was further enhanced by adding 1 at% Sc (acceptor) dopant in SrTiO to a value of 3300 with the tangent loss being ≤0.01 up to 1000 kV cm.

摘要

我们报告了具有最高报道值的室温下 SrTiO-SmO 纳米复合薄膜的纳米工程化，其换向品质因数 (CQF 或 K 因子) >2800。这些薄膜还具有较大的介电常数可调谐性 (49%)、低损耗正切 (tanδ=0.01) 和 SrTiO 的居里温度 >300°C，使其非常适合可调谐 RF 应用。增强的性能源于薄膜中的独特纳米结构，其中直径<20nm 的应变控制 SmO 纳米柱嵌入 SrTiO 基体中。在 SrTiO 中诱导出非常大的面外应变 (高达 2.6%) 和高四方度 (c/a) (高达 1.013)。通过在 SrTiO 中添加 1at% Sc(受主)掺杂剂，将 K 因子进一步提高到 3300，损耗正切值在 1000kV/cm 以下时 ≤0.01。