Dielectric spectroscopy of perovskite-type artificial superlattice in micro to millimeter wave region

微毫米波区钙钛矿型人工超晶格介电谱

• 批准号: 14350349
• 负责人: TSURUMI Takaaki
• 金额: $ 9.66万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350349/
• 关键词: artificial superlattice; perovskite compounds; dielectricity; ferroelectricity; electromagnetic field analysis; MBE法; 誘電特性; 変調周期構造; 高周波物性

Artificial superlattices made by a thin film technology of atomic level have potential to show excellent and new properties due to the man made structures. In this study, we have developed a technology to measure dielectric properties of the perovskite type artificial superlattices from kHz to few GHz in order to find unique properties of the superlattices in micro and millimeter wave regions. At first, a system which enables us to measure dielectric properties up to 110MHz was developed and the properties of BaTiO_3/SrTiO_3 superlattices were measured. The dielectric permittivity of the superlattices was determined using electromagnetic field analysis of admittance data obtained using interdigital electrodes on the films. It was found that the superlattice with the period of 10 unit cells showed high permittivity of 33,000 up to 110 MHz. The dielectric properties of SrZrO_3/SrTiO_3 superlattices were also measured and it was found that the superlattice with the period of 10 unit cells showed ferroelectricity in spite of the paraelectric/paraelectric combination of the materials. Furthermore, a new measuring method of dielectric properties in micro wave region was proposed. In this method, fine planer electrodes were employed to measure admittance of the specimen. The dielectric permittivity of [(SrZrO_3)_<10>/(SrTiO_3)_<10>]_4 superlattice was above 8,000 below 100 MHz and it decreased around 4,000 at 3 GHz.

利用原子水平的薄膜技术制备的人工超晶格，由于其结构的人工化，有可能显示出优异的新性能。在这项研究中，我们开发了一种技术来测量从kHz到几GHz的钙钛矿型人工超晶格的介电性能，以发现超晶格在微米和毫米波区域的独特性能。首先，我们研制了一套在110 MHz频率下测量介电性能的系统，并对BaTiO_3/SrTiO_3超晶格的介电性能进行了测量。超晶格的介电常数的测定使用电磁场分析的导纳数据获得使用叉指电极上的薄膜。结果发现，具有10个晶胞的周期的超晶格显示高达33，000的高介电常数至110 MHz。测量了SrZrO_3/SrTiO_3超晶格的介电性能，发现周期为10个晶胞的SrZrO_3/SrTiO_3超晶格尽管是顺电/顺电复合材料，但仍表现出铁电性。在此基础上，提出了一种新的微波区介电特性测量方法。该方法采用细平面电极测量试件的导纳。[（SrZrO_3）_<10>/（SrTiO_3）_<10>]_4超晶格的介电常数在100 MHz以下大于8，000，在3 GHz时下降到4，000左右。

项目成果

T.Tsurumi, H.Adachi, H.Kakemoto, S.Wada, Y.Mizuno, H.Chazono, H.Kishi: "Dielectric Properties of BaTiO_3 Based Ceramics under High Electric Field"Japanese Journal of Applied Physics. 41. 6829-6933 (2002)

T.Tsurumi、H.Adachi、H.Kakemoto、S.Wada、Y.Mizuno、H.Chazono、H.Kishi：“高电场下BaTiO_3基陶瓷的介电性能”日本应用物理学杂志。

T.Tsurumi, Y.Yamamoto, H.Kakemoto, S.Wada, H.Chazono, H.Kishi: "Dielectric Properties of BaTiO_3 Solid Solution under High AC-field"Journal of Materials Research. 17[4]. 755-759 (2002)

T.Tsurumi、Y.Yamamoto、H.Kakemoto、S.Wada、H.Chazono、H.Kishi：“高交流场下 BaTiO_3 固溶体的介电性能”材料研究杂志。

T.Tsurumi: "Dielectric and optical properties of perovskite type oxide artificial superlattices"J.Appl.Phys. 98. 2284-89 (2002)

T.Tsurumi：“钙钛矿型氧化物人工超晶格的介电和光学特性”J.Appl.Phys。

T.Tsurumi et al.: "Computer Simulation of Polarization vs. Electric-Field Curves of Non-linear Dielectrics and Macromodel for SPICE Simulator"Jpn.J.Appl.Phys.. 42. 6983-6987 (2003)

T.Tsurumi 等人：“非线性电介质的极化与电场曲线的计算机模拟以及 SPICE 模拟器的宏模型”Jpn.J.Appl.Phys.. 42. 6983-6987 (2003)

T.Harigai, T.Teranishi, H.Kakemoto, S.Wada, T.Tsurumi: "Dielectric Properties of BaTiO_3/SrTiO_3 Superlattices Measured with Interdigital Electrodes and Electromagnetic Field Analysis"Journal of Applied Physics. 94. 7923-7925 (2003)

T.Harigai、T.Teranishi、H.Kakemoto、S.Wada、T.Tsurumi：“用叉指电极和电磁场分析测量BaTiO_3/SrTiO_3超晶格的介电性能”应用物理学杂志。