Enhanced tunability of sandwich-like structural barium strontium titanate thin films on stainless steel substrates
Source abstract
Abstract
Barium strontium titanate (BST) thin films deposited on stainless steel (SS) substrates can be expected for their potential applications in MEMS-structure tunable microwave devices. In this paper, two sandwich-like structures with varied average Ba/Sr ratio of BST thin films, Ba0.6Sr0.4TiO3 layer in the middle or at ends, on LaNiO3 buffered SS substrates were fabricated by sol–gel technique, and meanwhile were theoretically carried out via a modified phenomenological model. Results show that dielectric constant and tunability of such BST films can be tailored by average Ba/Sr ratio and structures. When the average Ba/Sr ratio is unchanged, the structure with smaller lattice parameter of middle layer than that of top/bottom layer can achieve larger tunability resulting from its smaller compressive misfit strain, which has been qualitatively characterized by X-ray diffraction and Raman spectra. Especially, the largest tunability reaches 30 % under the electric field of 300 kV cm−1 by locating Ba0.4Sr0.6TiO3 layer in the middle and Ba0.6Sr0.4TiO3 layers at ends. Furthermore, the experimental dielectric constants and tunabilities are in good agreement with the calculated data, instructing that the dielectric properties of BST thin films with unchanged Ba/Sr ratio can be tailored by changing the structure to adjust the lattice misfit strain of each uniform layer. This implies that multilayer BST thin films also can be designed by phenomenological theory.
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Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis · Electronic and Structural Properties of Oxides
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References (26)
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1. Kong LB, Li S, Zhang TS, Zhai JW, Boey FYC, Ma J (2010) Electrically tunable dielectric materials and strategies to improve their performances. Prog Mater Sci 55:840–89310.1016/j.pmatsci.2010.04.004 ↗
2. Tagantsev AK, Sherman VO, Astafiev KF, Venkatesh J, Setter N (2003) Ferroelectric materials for microwave tunable applications. J Electroceram 11:5–6610.1023/B:JECR.0000015661.81386.e6 ↗
3. Lee C-H, Orloff ND, Birol T, Zhu Y, Gian V, Rocas E et al (2013) Exploiting dimensionality and defect mitigation to create tunable microwave dielectrics. Nature 502:532–53610.1038/nature12582 ↗
4. Stemme F, Brus M, GeBwein H, Schroeder M, Sazegar M, Drahus MD et al (2013) Fabrication and characterization of iron and fluorine co-doped BST thin films for microwave applications. J Mater Sci 48:3586–3596. doi: 10.1007/s10853-013-7156-510.1007/s10853-013-7156-5 ↗
5. Sun X, Yang Y, Zhang Q, Zhou X, Zongzhi H, Huang C (2014) Enhanced dielectric and tunable properties of barium strontium titanate thin films through introducing Nd(Zn1/2Ti1/2)O3 and adjusting Ba/Sr. J Mater Sci 49:1058–1065. doi: 10.1007/s10853-013-7783-x10.1007/s10853-013-7783-x ↗
6. Rouahi A, Kahouli A, Sylvestre A, Defaÿ E, Yangui B (2012) Impedance spectroscopic and dielectric analysis of Ba0.7Sr0.3TiO3 thin films. J Alloys Comp 529:84–8810.1016/j.jallcom.2012.02.137 ↗
7. Sharma AK, Gautam AK, Farinelli P, Dutta A, Singh SG (2015) A Ku band 5 bit MEMS phase shifter for active electronically steerable phased array applications. J Micromech Microeng 25:03501410.1088/0960-1317/25/3/035014 ↗
8. Unlu M, Demir S, Akin T (2013) A 15–40-GHz frequency reconfigurable RF MEMS phase shifter. IEEE Trans Microw Theory 61:2865–287710.1109/TMTT.2013.2271995 ↗
9. Huang S, Chen J, Cheng J (2015) Fabrication and characterization of compositionally graded PbxSr1−xTiO3 thin films by the sol–gel method. J Solgel Sci Technol 73:278–28210.1007/s10971-014-3587-y ↗
10. Wang J, Xiang J, Bai L, TingzhiLiu GY, Zhang TJ (2008) Microstructure, dielectric and optical properties of compositionally graded Ba1−xSrxTiO3 thin film. Mater Chem Phys 112:542–54510.1016/j.matchemphys.2008.05.095 ↗
11. Weiss CV, Okatan MB, Alpay SP, Cole MW, Ngo E, Toonen RC (2009) Compositionally graded ferroelectric multilayers for frequency agile tunable devices. J Mater Sci 44:5364–5374. doi: 10.1007/s10853-009-3514-810.1007/s10853-009-3514-8 ↗
12. Ban Z-G, Alpay SP (2002) Phase diagrams and dielectric response of epitaxial barium strontium titanate films: a theoretical analysis. J Appl Phys 91:9288–929610.1063/1.1473675 ↗
13. Ban Z-G, Alpay SP (2003) Optimization of the tunability of barium strontium titanate films via epitaxial stresses. J Appl Phys 93:504–51110.1063/1.1524310 ↗
14. Sharma A, Ban Z-G, Alpay SP, Mantese JV (2004) The role of thermally-induced internal stresses on the tunability of textured barium strontium titanate films. Appl Phys Lett 85:985–98710.1063/1.1781356 ↗
15. Khassaf H, Khakpash N, Sun F, Sbrockey NM, Tompa GS, Kalkur TS et al (2014) Strain engineered barium strontium titanate for tunable thin film resonators. Appl Phys Lett 104:20290210.1063/1.4879281 ↗
16. Zhong S, Alpay SP, Cole MW, Ngo E, Hirsch S, Demaree JD (2007) Highly tunable and temperature insensitive multilayer barium strontium titanate films. Appl Phys Lett 90:09290110.1063/1.2710005 ↗
17. Pertsev NA, Zembilgotov AG, Tagantsev AK (1998) Effect of mechanical boundary conditions on phase diagrams of epitaxial ferroelectric thin films. Phys Rev Lett 80:1988–199110.1103/PhysRevLett.80.1988 ↗
18. Chunlin F, Yang C, Chen H, Liye H, Wang Y (2005) Ferroelectric properties of Ba0.6Sr0.4TiO3 thin films with different grain sizes. Mater Lett 59:330–33310.1016/j.matlet.2004.10.023 ↗
19. Chen H, Yang C, Zhang J, Leng W, Ji H, Wang Z et al (2010) Two critical grain sizes of Ba0.6Sr0.4TiO3 thin films. J Mater Sci Mater Electron 21:236–24010.1007/s10854-009-9898-z ↗
20. Sinnamon LJ, Bowman RM, Gregg JM (2001) Investigation of dead-layer thickness in SrRuO3/Ba0.5Sr0.5TiO3/Au thin-film capacitors. Appl Phys Lett 78:1724–172610.1063/1.1356731 ↗
21. Sinnamon LJ, Saad MM, Bowman RM, Gregg JM (2002) Exploring grain size as a cause for “dead-layer” effects in thin film capacitors. Appl Phys Lett 81:703–70510.1063/1.1494837 ↗
22. Zhang J, Zhai J, Chou X, Shao J, Xiang L, Yao X (2009) Microwave and infrared dielectric response of tunable Ba1−xSrxTiO3 ceramics. Acta Mater 57:4491–449910.1016/j.actamat.2009.06.011 ↗
23. Zhang Y, Chen C, Gao R, Xia F, Li Y, Che R (2015) Abnormal cubic-tetragonal phase transition of barium strontium titanate nanoparticles studied by in situ Raman spectroscopy and transmission electron microscopy heating experiments. Appl Phys Lett 107:18290210.1063/1.4935027 ↗
24. Liao J, Wei X, Ziqiang X, Wei X, Wang P (2012) The structure and dielectric properties of a novel kind of doped Ba0.6Sr0.4TiO3 film. Mater Chem Phys 135:1030–103510.1016/j.matchemphys.2012.06.009 ↗
25. Radhapiyari Laishram SK, Pandey OP, Thakur DKB (2013) Dielectric and optical properties of Ba0.6Sr0.4Ti0.99Fe0.01O3 thin films deposited by pulsed laser deposition technique for microwave tunable devices. J Alloys Compd 579:205–20810.1016/j.jallcom.2013.06.057 ↗
26. Tarale AN, Sutar MM, Salunkhe DJ, Joshi PB, Kulkarni SB, Pawar RC et al (2013) Dielectric properties of sol-gel synthesized SrTiO3/(Ba0.7Sr0.3)TiO3 and SrTiO3/Ba(Zr0.3Ti0.7)O3 thin film heterostructures. J Mater Sci Mater Electron 24:1308–131810.1007/s10854-012-0925-0 ↗