The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Lane W. Martin - One of the best experts on this subject based on the ideXlab platform.

  • Orientation-dependent structural phase diagrams and dielectric properties of PbZr1-x Tix O3 polydomain thin Films
    Physical Review B, 2015
    Co-Authors: Ruijuan Xu, J. Zhang, Zuhuang Chen, Lane W. Martin
    Abstract:

    © 2015 American Physical Society. The Orientation-dependent equilibrium ferroelectric domain structures and dielectric properties of polydomain PbZr 1-x Ti x O 3 thin Films are investigated using a phenomenological Ginzburg-Landau-Devonshire thermodynamic model. We develop and describe three-dimensional polydomain models for (001)-, (101)-, and (111)-oriented Films and explore the evolution of the structure and dielectric permittivity of the system as a function of epitaxial strain across the composition range 0.5 ≤ x ≤ 1.0. Our studies reveal that the Film Orientation, epitaxial strain, and composition can combine in unexpected ways to drive exotic phase stability and transformations which have intriguing implications for the properties. In particular, in (101)- and (111)-oriented Films, the application of epitaxial strains along non-〈001〉-type crystallographic directions significantly reduces the stability range of the parent tetragonal phase [which is dominant in (001)-oriented Films] and results in a variety of new symmetries. We also observe that the Film Orientation can be used to tune the relative fraction of intrinsic (i.e., within a domain) and extrinsic (i.e., from domain wall motion) contributions to the dielectric permittivity. Ultimately these studies reveal how composition, epitaxial strain, and Film Orientation provide for comprehensive control of the structure and properties of ferroelectrics.

  • effects of nonequilibrium growth nonstoichiometry and Film Orientation on the metal to insulator transition in ndnio3 thin Films
    ACS Applied Materials & Interfaces, 2014
    Co-Authors: Eric Breckenfeld, Zuhuang Chen, Lane W. Martin, Anoop R Damodaran
    Abstract:

    Next-generation devices will rely on exotic functional properties not found in traditional systems. One class of materials of particular interest for applications are those possessing metal-to-insulator transitions (MITs). In this work, we probe the relationship between variations in the growth process, subsequent variations in cation stoichiometry, and the MIT in NdNiO3 thin Films. Slight variations in the growth conditions, in particular the laser fluence, during pulsed-laser deposition growth of NdNiO3 produces Films that are both single-phase and coherently strained to a range of substrates despite possessing as much as 15% Nd-excess. Subsequent study of the temperature-dependence of the electronic transport reveals dramatic changes in both the onset and magnitude of the resistivity change at the MIT with increasing cation nonstoichiometry giving rise to a decrease (and ultimately a suppression) of the transition and the magnitude of the resistivity change. From there, the electronic transport of near...

King Lun Yeung - One of the best experts on this subject based on the ideXlab platform.

  • influence of the synthesis conditions and growth environment on mfi zeolite Film Orientation
    Microporous and Mesoporous Materials, 2002
    Co-Authors: Louisa Tak Yin Au, King Lun Yeung
    Abstract:

    Abstract Zeolite powders and Films were prepared from six published synthesis recipes claimed to produce zeolite Film coatings and membranes with (2 0 0), (0 2 0), (0 0 2) and (1 0 1) Orientations. The morphology and Orientation of the zeolite Films prepared from each synthesis recipe were characterized and compared to determine the influence of synthesis composition and crystallization conditions. The zeolite growth environment was manipulated by changing the seed concentration on the substrate. The experimental results indicate that the synthesis chemistry and crystallization conditions affect the crystal grain morphology, whereas the growth environment influences the crystal habit. A simple method for predicting the Orientation of the zeolite Film based on the morphology of the zeolite crystal and the growth environment is also presented.

John M. Krochta - One of the best experts on this subject based on the ideXlab platform.

  • Water vapor permeability properties of edible whey protein-lipid emulsion Films
    Journal of the American Oil Chemists’ Society, 1994
    Co-Authors: Tara Habig Mchugh, John M. Krochta
    Abstract:

    The water vapor permeability (WVP) of whey protein emulsion Films was investigated. The exponential effect of relative humidity on the WVP of whey protein Films was reduced through lipid incorporation. Film Orientation had a significant effect on WVP due to emulsion separation during Film formation. Heat denaturation of whey proteins lowered emulsion Film WVP. Increasing fatty acid and fatty alcohol chainlengths significantly reduced WVP, as did increasing lipid concentration. The WVPs of fatty acids, fatty alcohols and beeswax were compared in whey protein-lipid emulsion Films. Scanning and transmission electron microscopy revealed the crystalline microstructure of lipid particles in emulsion Films.

  • water vapor permeability of caseinate based edible Films as affected by ph calcium crosslinking and lipid content
    Journal of Food Science, 1993
    Co-Authors: Roberto J Avenabustillos, John M. Krochta
    Abstract:

    Edible Films were cast from solutions of sodium or calcium caseinate and from emulsions of these proteins with acetylated monoglyceride, beeswax, and stearic acid. The water vapor permeabilities of the Films were evaluated at 25°C using the ASTM E96–80 method, modified to calculate the % relative humidity at the Film underside. Adjustment to pH 4.6 (isoelectric point), calcium ion crosslinking and combined effects of calcium ascorbate buffer (pH 4.6) reduced water vapor permeability of sodium caseinate Films by 36%, 42%, and 43%, respectively. Calcium caseinate-beeswax emulsion Films had water vapor permeabilities up to 90% lower than pure sodium caseinate Films. Water vapor permeability varied by a factor of two depending on emulsion Film Orientation, indicating nonisotropic structure.

Josep Fontcuberta - One of the best experts on this subject based on the ideXlab platform.

  • Tunable epitaxial growth of magnetoresistive La2/3Sr1/3MnO3 thin Films
    Journal of Applied Physics, 1999
    Co-Authors: Josep Fontcuberta, V. Trtik, Manuel Bibes, C. Ferrater, Benjamín Martínez, Florencio Sánchez, Maria Varela
    Abstract:

    We report on the growth of epitaxial La2/3Sr1/3MnO3 thin Films on buffered Si(001) substrates. We show that a suitable choice of the buffer heterostructure allows one to obtain epitaxial (00h), (0hh), and (hhh) manganite thin Films. The magnetotransport properties are investigated and we have found that the low-field magnetoresistance is directly related to the width of the normal-to-plane rocking curves, irrespective of the Film Orientation. The magnetic anisotropy of these Films has also been determined.We report on the growth of epitaxial La2/3Sr1/3MnO3 thin Films on buffered Si(001) substrates. We show that a suitable choice of the buffer heterostructure allows one to obtain epitaxial (00h), (0hh), and (hhh) manganite thin Films. The magnetotransport properties are investigated and we have found that the low-field magnetoresistance is directly related to the width of the normal-to-plane rocking curves, irrespective of the Film Orientation. The magnetic anisotropy of these Films has also been determined.

  • Tunable epitaxial growth of magnetoresistive La[sub 2/3]Sr[sub 1/3]MnO[sub 3] thin Films
    Journal of Applied Physics, 1999
    Co-Authors: Josep Fontcuberta, B. Martı́nez, V. Trtik, F. Sánchez, Manuel Bibes, C. Ferrater, Martín Varela
    Abstract:

    We report on the growth of epitaxial La 2/3 Sr 1/3 MnO 3 thin Films on buffered Si(001) substrates. We show that a suitable choice of the buffer heterostructure allows one to obtain epitaxial (00h), (0hh), and (hhh) manganite thin Films. The magnetotransport properties are investigated and we have found that the low-field magnetoresistance is directly related to the width of the normal-to-plane rocking curves, irrespective of the Film Orientation. The magnetic anisotropy of these Films has also been determined.

Christopher M Bates - One of the best experts on this subject based on the ideXlab platform.

  • synthesis and thin Film Orientation of poly styrene block trimethylsilylisoprene
    Journal of Polymer Science Part A, 2013
    Co-Authors: Christopher M Bates, Marco Bedolla A Pantoja, Jeffrey R Strahan, Leon M Dean, Brennen K Mueller, Christopher J Ellison, Paul F Nealey, Grant C Willson
    Abstract:

    The successful synthesis, characterization, and directed self-assembly of a silicon-containing block copolymer, poly(styrene-block-trimethylsilylisoprene) (P(S-b-TMSI)), which has much higher oxygen etch contrast than the de facto standard, poly(styrene-block-methyl methacrylate) is reported. A Sakurai, Grignard-type coupling reaction provided the key monomer in good yield. Living anionic polymerization was employed to prepare the block copolymer, which has very low polydispersity. P(S-b-TMSI) was successfully ordered and oriented by directed self-assembly. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013

  • Synthesis and thin‐Film Orientation of poly(styrene‐block‐trimethylsilylisoprene)
    Journal of Polymer Science Part A, 2012
    Co-Authors: Christopher M Bates, Marco Bedolla A Pantoja, Jeffrey R Strahan, Leon M Dean, Brennen K Mueller, Christopher J Ellison, Paul F Nealey, C. Grant Willson
    Abstract:

    The successful synthesis, characterization, and directed self-assembly of a silicon-containing block copolymer, poly(styrene-block-trimethylsilylisoprene) (P(S-b-TMSI)), which has much higher oxygen etch contrast than the de facto standard, poly(styrene-block-methyl methacrylate) is reported. A Sakurai, Grignard-type coupling reaction provided the key monomer in good yield. Living anionic polymerization was employed to prepare the block copolymer, which has very low polydispersity. P(S-b-TMSI) was successfully ordered and oriented by directed self-assembly. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013