Enhanced dielectric properties of (Ba,Sr)TiO3//Ba(Zr,Ti)O-3 heterostructures with optimized structure design
Crystal Engineering Communications
Environment-friendly ferroelectric Mn:BST//Mn:BZT heterostructures were epitaxially deposited on (001) MgO substrates by pulsed laser deposition with different combination ratios of Mn:BST over Mn:BZT, 2.5:7.5; 1:1; and 7.5:2.5. The microstructural studies indicate that the in-plane interface relationships between the heterostructures and the substrate are determined to be (001)Mn:BST//(001)Mn:BZT//(001)MgO and Mn:BST//Mn:BZT//MgO. The Ku band microwave (15.5–18 GHz) dielectric property characterizations show that the dielectric constant, dielectric loss, and tunabilities of the heterostructures are highly dependent upon the sequences of Mn:BST to Mn:BZT. The optimized dielectric tunability with a low loss tangent was found to be 58.1%–74.4% under the combination ratio of 1:1 for Mn:BST to Mn:BZT, which suggests that the as-grown ferroelectric heterostructures can be developed for room temperature tunable microwave elements and related device applications.
Royal Society of Chemistry
Liu, Ming; Liu, Jian; Ma, Chunrui; Collins, Gregory; Chen, Chonglin; Alemayehu, Andy D.; Subramanyam, Guru; He, Jie; Jiang, Jiechao; Meletis, Efstathios I.; and Bhalla, Amar, "Enhanced dielectric properties of (Ba,Sr)TiO3//Ba(Zr,Ti)O-3 heterostructures with optimized structure design" (2013). Electrical and Computer Engineering Faculty Publications. 30.