Dependence of dielectric properties on internal stresses in epitaxial barium strontium titanate thin films

Li, Hao; Roytburd, A. L.; Alpay, S. P.; Tran, T. D.; Salamanca-Riba, L.; Ramesh, R.
April 2001
Applied Physics Letters;4/16/2001, Vol. 78 Issue 16, p2354
Academic Journal
A series of heteroepitaxial Ba[sub x]Sr[sub 1-x]TiO[sub 3] thin films with composition x=0.50 were deposited on (001) MgO substrates by pulsed-laser deposition. The thickness of the films was varied from 14 to 500 nm to produce a systematically decreasing level of in-plane tensile stresses. The microstructural and crystallographic features of the films were determined via transmission electron microscopy and x-ray diffraction. A theoretical treatment of the in-plane misfit strain as a function of film thickness is in agreement with the measured out-of-plane lattice parameters. Electrical measurements indicate a drop in the dielectric constant from 2350 for highly stressed thin films to 1700 for relaxed thicker films. The variation in the dielectric constant with the misfit strain is in accordance with a thermodynamic model developed. The relationship between the dielectric constant and electric field is also described by extending the thermodynamic model and taking the effect of electric field into account. A new definition of tunability is adopted to study the effect of strain on tunability. © 2001 American Institute of Physics.


Related Articles

  • Electrical and magnetic transport properties of laser-deposited Ba[sub 1-x]K[sub x]BiO[sub 3].... Schweinfurth, R.A.; Platt, C.E. // Applied Physics Letters;7/27/1992, Vol. 61 Issue 4, p480 

    Investigates the electrical and transport properties of laser-deposited Ba[sub 1-x]K[sub x]BiO[sub 3] thin films. Application of the in situ pulsed laser deposition; Exhibition of resistance and magnetic transitions; Determination of critical current densities; Observation of substantial field...

  • Growth of the infinite layer phase of Sr[sub 1-x]Nd[sub x]CuO[sub 2] by laser ablation. Chunming Niu; Lieber, Charles M. // Applied Physics Letters;10/5/1992, Vol. 61 Issue 14, p1712 

    Investigates the growth of the infinite layer phase of strontium copper dioxide. Utilization of pulsed laser deposition in the preparation of the thin films; Characterization of the electrical properties of the thin films; Changes in the electrical properties of the material with increasing...

  • Electrical transport properties of artificially layered films of.... Arciprete, F.; Balestrino, G. // Applied Physics Letters;8/18/1997, Vol. 71 Issue 7, p959 

    Examines the electrical transport properties of artificially layered BaCuO[sub 2]/(Sr,Ca)CuO[sub 2] thin films. List of parameters for superconductive property determination; Comparison between the resistivity of films with strontium and calcium ions; Growth of films by pulsed laser deposition.

  • Structural and electrical properties of La[sub 0.5]Sr[sub 0.5]CoO[sub 3] epitaxial films. Cheung, Jeffrey T.; Morgan, Peter E.D.; Lowndes, Douglas H.; Zheng, X.-Y.; Breen, John // Applied Physics Letters;4/26/1993, Vol. 62 Issue 17, p2045 

    Investigates the electrical and structural properties of La[sub 0.5]Sr[sub 0.5]CuO[sub 3] epitaxial films. Use of pulsed laser deposition in growing the films; Formation of thin films; Comparison between La[sub 0.5]Sr[sub 0.5]CuO and YBa[sub 2]Cu[sub 3]O[sub 7-x].

  • Influence of strain on microwave dielectric properties of (Ba,Sr)TiO... thin films. Chang, Wontae; Gilmore, Charles M. // Journal of Applied Physics;3/15/2000, Vol. 87 Issue 6, p3044 

    Deals with a study on the effects of film strain on the dielectric properties of epitaxial BST films deposited by pulsed-laser deposition. Details on the experiment; Film strain and microwave dielectric properties; Theoretical analysis of the dielectric properties of epitaxial BST films.

  • Background oxygen effects on pulsed laser deposited Na[sub 0.5]K[sub 0.5]NbO[sub 3] films: From superparaelectric state to ferroelectricity. Cho, Choong-Rae; Grishin, Alex // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p4439 

    Ambient oxygen pressure in a pulsed laser deposition process has been observed to have a critical influence on the compositional, crystalline, and electrical properties of Na[sub 0.5]K[sub 0.5]NbO[sub 3] (NKN) thin films grown onto polycrystalline Pt[sub 80]Ir[sub 20] and SiO[sub 2] (native...

  • Enhanced ultraviolet photoconductivity in semiconducting ZnGa[sub 2]O[sub 4] thin films. Lee, Yong Eui; Norton, David P.; Budai, John D.; Wei, Yayi // Journal of Applied Physics;10/15/2001, Vol. 90 Issue 8, p3863 

    We have investigated the conductivity and photoconductivity response of undoped and Li-doped ZnGa[sub 2]O[sub 4] epitaxial films grown using pulsed-laser deposition. A significant enhancement of the ultraviolet (UV) photoresponse is observed with Li doping that also correlates with an enhanced...

  • Discovery of a useful thin-film dielectric using a composition-spread approach. Van Dover, R.B.; Schneemeyer, L.F.; Fleming, R. M. // Nature;3/12/1998, Vol. 392 Issue 6672, p162 

    Presents research which showed that a composition-spread technique allows for the efficient evaluating of materials with both a high dielectric constant and a high breakdown field. Application of approach to the Zr--Sn--Ti--O system; Better thin-film dielectrics resulting; Applications for...

  • Microstructure and ferroelectric properties of compositionally graded Nd-doped BiTiO thin films prepared by sol-gel method. Liu, Changyong; Gong, Yiping; Guo, Dongyun; Wang, Chuanbin; Shen, Qiang; Zhang, Lianmeng // Journal of Materials Science: Materials in Electronics;Sep2012, Vol. 23 Issue 9, p1711 

    The compositionally graded BiNdTiO (BNT) thin films were prepared on Pt/Ti/SiO/Si substrates by sol-gel method. Their microstructure, ferroelectric and dielectric properties were investigated. The single-phase upgraded and downgraded BNT films were obtained with (117) preferred orientation....


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics