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Stoichiometry and Deposition Temperature Dependence of the Microstructural and Electrical Properties of Barium Strontium Titanate Thin Films

Description: Barium Strontium Titanate (BST) was deposited on Pt/ZrO2 / SiO2/Si substrates using liquid source metal organic chemical vapor deposition. A stoichiometry series was deposited with various GrII/Ti ratios (0.658 to 1.022) and a temperature series was deposited at 550 to 700°C. The thin films were characterized using transmission electron microscopy. Both series of samples contained cubic perovskite BST and an amorphous phase. The grain size increased and the volume fraction of amorphous phase de… more
Date: May 1998
Creator: Pena, Piedad
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Role of Microstructural Phenomena in Magnetic Thin Films. Final Report

Description: Over the period of the program we systematically varied microstructural features of magnetic thin films in an attempt to better identify the role which each feature plays in determining selected extrinsic magnetic properties. This report summarizes the results.
Date: April 30, 2001
Creator: Laughlin, D. E. & Lambeth, D. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mechanical Properties of Materials with Nanometer Scale Microstructures

Description: We have been engaged in research on the mechanical properties of materials with nanometer-scale microstructural dimensions. Our attention has been focused on studying the mechanical properties of thin films and interfaces and very small volumes of material. Because the dimensions of thin film samples are small (typically 1 mm in thickness, or less), specialized mechanical testing techniques based on nanoindentation, microbeam bending and dynamic vibration of micromachined structures have been d… more
Date: October 31, 2004
Creator: Nix, William D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of Boron Nitride Thin Films on Silicon (100) Wafer.

Description: Cubic boron nitride (cBN) thin films offer attractive mechanical and electrical properties. The synthesis of cBN films have been deposited using both physical and chemical vapor deposition methods, which generate internal residual, stresses that result in delamination of the film from substrates. Boron nitride films were deposited using electron beam evaporation without bias voltage and nitrogen bombardment (to reduce stresses) were characterize using FTIR, XRD, SEM, EDS, TEM, and AFM technique… more
Date: August 2007
Creator: Maranon, Walter
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Thin film adhesion by nanoindentation-induced superlayers. Final report

Description: This work has analyzed the key variables of indentation tip radius, contact radius, delamination radius, residual stress and superlayer/film/interlayer properties on nanoindentation measurements of adhesion. The goal to connect practical works of adhesion for very thin films to true works of adhesion has been achieved. A review of this work titled ''Interfacial toughness measurements of thin metal films,'' which has been submitted to Acta Materialia, is included.
Date: June 2001
Creator: Gerberich, William W. & Volinsky, A. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Stress Evolution Behavior in CoCrPt Alloy Thin Films with varying Pt Concentration

Description: CoCrPt alloy thin film is one of the most promising candidates for ultrahigh density magnetic recording media. One of interesting issues for an application of ferromagnetic thin film to high density magnetic recording media is to investigate growth stress, since stress inevitably generated during thin film fabrication drastically alters magnetic properties as well as mechanical properties due to film fracture and buckling [1]. However, sufficient studies have not been addressed on in situ exper… more
Date: November 1, 2007
Creator: Im, M.-Y.; Jeong, J.-R. & Shin, S.-C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effect of Underlayer on Coalescence of Silver Islands Grown Byfiltered Cathodic Arc Deposition

Description: For low-emissivity application on window glass, coalescenceof thin film silver islands is crucial for high transmittance in thevisible andhigh reflectance in the infrared. It is well known that theenergy of ions arriving at the substrate (kinetics) as wells as the typeof underlayer (thermodynamics) affect the nucleation and growth mode.Little is known about coalescence of silver islands synthesized byenergetic condensation, e.g., by filtered cathodic vacuum arc deposition.In this work, the effe… more
Date: March 1, 2003
Creator: Byon, Eungsun & Anders, Andre
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental characterization and mitigation of specimen charging on thin films with one conducting layer

Description: Specimen charging may be one of the most significant factors that contribute to the high variability generally low quality of images in cryo-electron microscopy. Understanding the nature of specimen charging can help in devising methods to reduce or even avoid its effects and thus improve the rate of data collection as well as the quality of the data. We describe a series of experiments that help to characterize the charging phenomenon which has been termed the Berriman effect. The pattern of b… more
Date: April 4, 2003
Creator: Downing, Kenneth H.; McCartney, M.R. & Glaeser, Robert M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Effect of Average Grain Size on Polycrystalline Diamond Films

Description: The work function of hydrogen-terminated, polycrystalline diamond was studied using ultraviolet photoelectron spectroscopy. Polycrystalline diamond films were deposited onto molybdenum substrates by electrophoresis for grain sizes ranging from 0.3 to 108 microns. The work function and electron affinity were measured using 21.2 eV photons from a helium plasma source. The films were characterized by x-ray photoelectron spectroscopy to determine elemental composition and the sp2/sp3 carbon fractio… more
Date: May 2002
Creator: Abbott, Patrick Roland
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Amorphization and De-vitrification in Immiscible Copper-Niobium Alloy Thin Films

Description: While amorphous phases have been reported in immiscible alloy systems, there is still some controversy regarding the reason for the stabilization of these unusual amorphous phases. Direct evidence of nanoscale phase separation within the amorphous phase forming in immiscible Cu-Nb alloy thin films using 3D atom probe tomography has been presented. This evidence clearly indicates that the nanoscale phase separation is responsible for the stabilization of the amorphous phase in such immiscible sy… more
Date: May 2007
Creator: Puthucode Balakrishnan, Anantharamakrishnan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Thin Films As a Platform for Understanding the Conversion Mechanism of FeF2 Cathodes in Lithium-Ion Microbatteries

Description: Conversion material electrodes such as FeF2 possess the potential to deliver transformative improvements in lithium ion battery performance because they permit a reversible change of more than one Li-ion per 3d metal cation. They outperform current state of the art intercalation cathodes such as LiCoO2, which have volumetric and gravimetric energy densities that are intrinsically limited by single electron transfer. Current studies focus on composite electrodes that are formed by mixing with ca… more
Date: August 2015
Creator: Santos-Ortiz, Reinaldo
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Reactivity of Oxide Surfaces and Metal-Oxide Interfaces: Effects of Water Vapor Pressure on Ultrathin Aluminum Oxide Films, and Studies of Platinum Growth Modes on Ultrathin Oxide Films and Their Effects on Adhesion

Description: The reactivity of oxide surfaces and metal-oxide interfaces play an important role in many technological applications such as corrosion, heterogeneous catalysis, and microelectronics. The focus of this research was (1) understanding the effects of water vapor exposure of ultrathin aluminum oxide films under non-ultrahigh vacuum conditions (>10-9 Torr) and (2) characterization of Pt growth modes on ultrathin Ta silicate and silicon dioxide films and the effects of growth modes on adhesion of a … more
Date: May 2004
Creator: Garza, Michelle
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Applications of Passive Thin Films

Description: The physical properties of thin films affect the performance and durability of nearly every solar energy conversion device. Familiar examples of thin films for solar applications are optical materials and protective coatings. Optimized optical properties are key to cost-effective photothermal conversion where individual components must have high absorptance, reflectance, or transmittance. The protection of sensitive substrates from corrosion and/or erosion is essential to ensure adequate compon… more
Date: May 1, 1979
Creator: Call, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Order Formation in Block Copolymer Thin Films UsingResonant Soft X-Ray Scattering

Description: The lateral order of poly(styrene-block-isoprene) copolymer(PS-b-PI) thin films is characterized by the emerging technique ofresonant soft X-ray scattering (RSOXS) at the carbon K edge and comparedto ordering in bulk samples of the same materials measured usingconventional small-angle X-ray scattering. We show resonance using theoryand experiment that the loss of scattering intensity expected with adecrease in sample volume in the case of thin films can be overcome bytuning X-rays to the pi* re… more
Date: November 27, 2006
Creator: Virgili, Justin M.; Tao, Yuefei; Kortright, Jeffrey B.; Balsara,Nitash P. & Segalman, Rachel A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Reliability of materials in MEMS : residual stress and adhesion in a micro power generation system.

Description: The reliability of thin film systems is important to the continued development of microelectronic and micro-electro-mechanical systems (MEMS). The reliability of these systems is often tied to the ability of the films to remain adhered to its substrate. By measuring the amount of energy to separate the film from the substrate, researchers can predicts film lifetimes. Recent work has resulted in several different testing techniques to measure this energy including spontaneous buckling, indentati… more
Date: September 1, 2007
Creator: Moody, Neville Reid; Kennedy, Marian S. (Washington State University, Pullman, WA) & Bahr, David F. (Washington State University, Pullman, WA)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High spatial resolution grain orientation and strain mapping in thin films using polychromatic submicron X-ray diffraction

Description: The availability of high brilliance synchrotron sources, coupled with recent progress in achromatic focusing optics and large area 2D detector technology, have allowed us to develop an X-ray synchrotron technique capable of mapping orientation and strain/stress in polycrystalline thin films with submicron spatial resolution. To demonstrate the capabilities of this instrument, we have employed it to study the microstructure of aluminum thin film structures at the granular and subgranular level. … more
Date: March 26, 2002
Creator: Tamura, N.; MacDowell, A. A.; Celestre, R. S.; Padmore, H. A.; Valek, B. C.; Bravman, J. C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Failure by fracture and fatigue in 'NANO' and 'BIO'materials

Description: The behavior of nanostructured materials/small-volumestructures and biologi-cal/bio-implantable materials, so-called "nano"and "bio" materials, is currently much in vogue in materials science. Oneaspect of this field, which to date has received only limited attention,is their fracture and fatigue properties. In this paper, we examine twotopics in this area, namely the premature fatigue failure ofsilicon-based micron-scale structures for microelectromechanical systems(MEMS), and the fracture pro… more
Date: December 19, 2003
Creator: Ritchie, R. O.; Muhlstein, C. L. & Nalla, R. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Advances in Photovoltaics at NREL

Description: This paper discusses the critical strategic research and development issues in the development of next-generation photovoltaic technologies, emphasizing thin-film technologies that are believed to ultimately lead to lower production costs. The critical research and development issues for each technology are identified. An attempt is made to identify the strengths and weaknesses of the different technologies, and to identify opportunities for fundamental research activities suited to advance the… more
Date: September 9, 1999
Creator: von Roedern, Bolko
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Low Temperature Polymeric Precursor Derived Zinc Oxide Thin Films

Description: Zinc oxide (ZnO) is a versatile environmentally benign II-VI direct wide band gap semiconductor with several technologically plausible applications such as transparent conducting oxide in flat panel and flexible displays. Hence, ZnO thin films have to be processed below the glass transition temperatures of polymeric substrates used in flexible displays. ZnO thin films were synthesized via aqueous polymeric precursor process by different metallic salt routes using ethylene glycol, glycerol, citr… more
Date: December 2006
Creator: Choppali, Uma
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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