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Investigation on Tunable Performance of BMN / BST Multilayer and BMN – BST Composite Thin Films
Author(s) -
Yu Shihui,
Li Lingxia,
Zhang Weifeng,
Xu Dan,
Dong Helei
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13365
Subject(s) - dielectric , dissipation factor , materials science , thin film , composite number , substrate (aquarium) , figure of merit , pulsed laser deposition , dielectric loss , analytical chemistry (journal) , nanotechnology , composite material , optoelectronics , chemistry , chromatography , oceanography , geology
The BMN/BST multilayer and BMN–BST composite thin films have been fabricated by pulsed laser deposition on Au/TiO x /SiO 2 /Si substrate. The multilayer thin films comprising one, two, and four periodic compositional Bi 1.5 MgNb 1.5 O 7 /Ba 0.6 Sr 0.4 TiO 3 (BMN/BST) layers (PCBLs) have been elaborated with the final same thickness. The four PCBLs show the largest dielectric constant of ~168 and tunability of 40.6% at a maximum applied bias field of 0.67 MV/cm and the lowest loss tangent of ~0.006, whereas the figure of merit (FOM) is 72. The BMN–BST composite thin films exhibit medium dielectric constant of ~238, low loss tangent of ~0.0053, and superior tunable dielectric properties at room temperature. Calculations of tunability and FOM display a maximum value of 49.3% at 670 kV/cm and ~88, respectively.