Microstructural and Electrical Characterization of Barium Strontium Titanate Thin Films

1994 ◽  
Vol 361 ◽  
Author(s):  
Yujing Wu ◽  
Elizabeth G. Jacobs ◽  
Russell F. Pinizzotto ◽  
Robert Tsu ◽  
Hung-Yu Liu ◽  
...  
Keyword(s):  
Grain Size ◽  
Electrical Characterization ◽  
Microstructural Characterization ◽  
Plan View ◽  
Pt Electrodes ◽  
Average Grain Size ◽  
Metal Organic ◽  
Bst Thin Film ◽  
Anneal Time

ABSTRACTThe kinetics of BST thin film grain nucleation and growth caused by rapid thermal annealing have been investigated. A series of Ba0.67Sr0.33Tii0.5O3 films were deposited on Pt electrodes using a metal-organic decomposition process. The effects of anneal time and temperature on BST grain sizes were studied by altering the processing conditions during RTA. A series of films were annealed by RTA at temperatures ranging from 550°C to 950°C for times ranging from 30 to 120 seconds. Crystallographic and microstructural characterization were done using XRD and TEM. The XRD results indicated that BST grain size increased with increasing anneal temperature, but was not affected by anneal time. Plan-view TEM indicated that BST grains were imbedded in an amorphous matrix. The average grain size was on the order of 200 Å.

Structural and Electrical Characterization of Doped Zirconia Nanostructured Fibres

2012 ◽  
Vol 545 ◽  
pp. 285-289
Author(s):  
Adrian Lowe ◽  
Deborah Eve Kho Siu Chu ◽  
Li Lu
Keyword(s):  
Grain Size ◽  
Electrical Characterization ◽  
Electrospinning Process ◽  
Electrical Performance ◽  
Energy Storage Materials ◽  
Impedance Response ◽  
Average Grain Size ◽  
Tetragonal Form ◽  
Cv Measurements

Pure and lithium-doped zirconia fibres have been produced using the electrospinning process. These fibres are seen to be mesoporous in nature and possess a dense outer skin that correlates with the existance of tetragonal structure. This tetragonal form exists in materials below a certain average grain size and also correlates well with capacitance retention, CV measurements and impedance response. During electrical performance, an initial irreversible solid electrolyte interface is believed to form and average grain size has a significant effect. This study suggests that in this mesoporous/skin form, electrospun zirconia fibres are promising energy storage materials.

scholarly journals Fabrication and Electrical Characterization of Translucent Bi12TiO20Ceramics

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
D. J. Santos ◽  
L. B. Barbosa ◽  
R. S. Silva ◽  
Z. S. Macedo
Keyword(s):  
Activation Energy ◽  
Grain Size ◽  
Dielectric Properties ◽  
Single Crystals ◽  
Optical Transmission ◽  
Electrical Characterization ◽  
High Density ◽  
Average Grain Size ◽  
Electrical And Dielectric Properties

The production of high-density Bi12TiO20ceramics, their transmission spectrum, and impedance features are reported. The samples were synthesized at 700°C/6 h and sintered at 800°C/3 h. This procedure yielded translucent ceramics with relative density of99.2±0.5% and average grain size of3.1±1.6 μm. Samples with 0.5 mm thickness were translucent with optical transmission of about 30% at 800 nm. The electrical and dielectric properties of the high-density ceramics were studied and compared with those measured for samples with lower density and also with the literature about Bi12TiO20single crystals. The activation energy for the conduction process in high-density ceramic was 0.99 eV, and the dielectric permittivity was 40 at 200°C. These values are comparable to those reported for single crystals.

Structural and Electrical Characterization of Shaped Beam Laser Recrystallized Polysilicon on Amorphous Substrates

1981 ◽  
Vol 4 ◽  
Author(s):  
T. J. Stultz ◽  
J. F. Gibbons
Keyword(s):  
Grain Size ◽  
Electrical Characterization ◽  
Grain Structure ◽  
Electrical Characteristics ◽  
Shaped Beam ◽  
Beam Laser ◽  
Cw Laser ◽  
Amorphous Substrates ◽  
Circular Beam

ABSTRACTStructural and electrical characterization of laser recrystallized LPCVD silicon films on amorphous substrates using a shaped cw laser beam have been performed. In comparing the results to data obtained using a circular beam, it was found that a significant increase in grain size can be achieved and that the surface morphology of the shaped beam recrystallized material was much smoother. It was also found that whereas circular beam recrystallized material has a random grain structure, shaped beam material is highly oriented with a <100> texture. Finally the electrical characteristics of the recrystallized film were very good when measured in directions parallel to the grain boundaries.

Vibratory weld conditioning during gas tungsten arc welding of al 5052 alloy on the mechanical and micro-structural behavior

2020 ◽  
Vol 17 (6) ◽  
pp. 831-836
Author(s):  
M. Vykunta Rao ◽  
Srinivasa Rao P. ◽  
B. Surendra Babu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Welded Joints ◽  
Great Influence ◽  
Welding Process ◽  
Microstructural Characterization ◽  
Content Type ◽  
Average Grain Size

Purpose Vibratory weld conditioning parameters have a great influence on the improvement of mechanical properties of weld connections. The purpose of this paper is to understand the influence of vibratory weld conditioning on the mechanical and microstructural characterization of aluminum 5052 alloy weldments. An attempt is made to understand the effect of the vibratory tungsten inert gas (TIG) welding process parameters on the hardness, ultimate tensile strength and microstructure of Al 5052-H32 alloy weldments. Design/methodology/approach Aluminum 5052 H32 specimens are welded at different combinations of vibromotor voltage inputs and time of vibrations. Voltage input is varied from 50 to 230 V at an interval of 10 V. At each voltage input to the vibromotor, there are three levels of time of vibration, i.e. 80, 90 and 100 s. The vibratory TIG-welded specimens are tested for their mechanical and microstructural properties. Findings The results indicate that the mechanical properties of aluminum alloy weld connections improved by increasing voltage input up to 160 V. Also, it has been observed that by increasing vibromotor voltage input beyond 160 V, mechanical properties were reduced significantly. It is also found that vibration time has less influence on the mechanical properties of weld connections. Improvement in hardness and ultimate tensile strength of vibratory welded joints is 16 and 14%, respectively, when compared without vibration, i.e. normal weld conditions. Average grain size is measured as per ASTM E 112–96. Average grain size is in the case of 0, 120, 160 and 230 is 20.709, 17.99, 16.57 and 20.8086 µm, respectively. Originality/value Novel vibratory TIG welded joints are prepared. Mechanical and micro-structural properties are tested.

Synthesis and Characterization of Plasma Synthesized Nanostructured Magnesia-Yttria Based Nanocomposites

2007 ◽  
Vol 1056 ◽  
Author(s):  
Jafar F. Al-Sharab ◽  
Rajendra Sadangi ◽  
Vijay Shukla ◽  
Bernard Kear
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Size ◽  
Chemical Mapping ◽  
X Ray Diffraction ◽  
Fine Grained ◽  
Transmission Electron ◽  
Spray Method ◽  
Average Grain Size

ABSTRACTPolycrystalline Y2O3 is the material of choice for IR windows since it has excellent optical properties in the visible, and near infra-red band. However, current processing methods yield polycrystalline Y2O3 with large grain size (> 100 μm), which limits the hardness and erosion resistance attainable. One way to improve strength is to develop an ultra-fine grained material with acceptable optical transmission properties. To realize a fine-grained ceramic, one approach is to develop a composite structure, in which one phase inhibits the growth of the other phase during processing. In this study, Y2O3-MgO nanocomposite with various MgO content (20, 50 and 80 mol%) were synthesized using plasma spray method. Extensive characterization techniques including x-ray diffraction, scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Energy Dispersive spectrometry (EDS) were employed to study the synthesized powder as well as the consolidated sample. Transmission Electron Microscopy, as well as EDS chemical mapping, revealed that the consolidated sample have bi-continuous MgO-Y2O3 nanostructure with an average grain size of 200 nm.

Preparation and Characterization of As-Cast and Hot-Rolled Mg-5Al-0.3Mn-1Ce Alloy

2011 ◽  
Vol 284-286 ◽  
pp. 1559-1563 ◽  
Author(s):  
Jian Li Wang ◽  
Jian Ping Li ◽  
Li Min Wang ◽  
Li Dong Wang
Keyword(s):  
Grain Size ◽  
Test Results ◽  
Casting Method ◽  
Rolled Sample ◽  
Cast Sample ◽  
Average Grain Size ◽  
Dislocation Strengthening ◽  
Hot Rolled ◽  
Mould Casting

Mg-5Al-0.3Mn-1Ce alloy was prepared by metal mould casting method. The as-cast ingot was homogenized and hot-rolled with total thickness reduction of 61% after four passes. Texture, microstructure and mechanical properties of the studied alloy were investigated. Results showed that the as-cast sample was mainly composed of a-Mg, Mg17Al12and Al11Ce3phases. Average grain size of the as-cast sample was about 500 μm. After hot-rolling, average grain size was greatly refined to about 20 μm. Further more, the long acicular Al11Ce3phase was smashed to small pieces. Tensile test results demonstrated that ultimate tensile strength and yield strength of the hot-rolled sample were improved by 65.2% and 165% respectively compared with those of the as-cast sample. Strength enhancement was attributed to grain refining strengthening and dislocation strengthening mechanisms.

Synthesis and Characterization of Carbon Nitride Thin Film with Evidence of Nanodomes

2004 ◽  
Vol 843 ◽  
Author(s):  
S. Chowdhury ◽  
M. T. Laugier
Keyword(s):  
Thin Film ◽  
Deposition Temperature ◽  
Carbon Nitride ◽  
Room Temperature ◽  
Electrical Characterization ◽  
Microstructural Characterization ◽  
Rf Magnetron Sputtering ◽  
Synthesis And Characterization ◽  
Sputtering System

ABSTRACTWe have reported the synthesis of carbon nitride thin films with evidence of formation of carbon nanodomes over a range of substrate temperature from 50 °C to 550 °C. An RF magnetron sputtering system was used for depositing carbon nitride films. The size of the nanodomes can be controlled by deposition temperature and increases from 40–80 nm at room temperature to 200–400 nm at high temperature (550 °C). Microstructural characterization was performed by AFM. Electrical characterization shows that these films have conductive behaviour with a resistivity depending on the size of the nanodomes. Resistivity values of 20 mΩ-cm were found for nanodomes of size 40–80 nm falling to 6 m?-cm for nanodomes of size 200–400 nm. Nanoindentation results show that the hardness and Young's modulus of these films are in the range from 9–22 GPa and 100–168 GPa respectively and these values decrease as the size of the nanodomes increases. GXRD results confirm that a crystalline graphitic carbon nitride structure has formed.

Electrical characterization of n-InP grown by metal-organic vapour-phase epitaxy

1987 ◽  
Vol 65 (8) ◽  
pp. 846-849
Author(s):  
M. Benzaquen ◽  
D. Walsh ◽  
K. Mazaruk ◽  
P. Weissfloch ◽  
N. Puetz ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Electrical Characterization ◽  
Vapour Phase ◽  
Donor Center ◽  
Vapour Phase Epitaxy ◽  
Deep Donor ◽  
Metal Organic ◽  
Organic Vapour ◽  
Electronic Concentration

At room-temperature, the Hall mobility observed in epitaxic n-InP samples grown by metal-organic vapour-phase epitaxy is often lower than predicted, with a corresponding rise in the electronic concentration. These effects are attributed to the presence of a residual deep donor center that both acts as a strong scatterer and provides the additional electronic excitation observed at high temperature as it ionizes. A binding energy of 215 meV is consistent with both electrical-transport measurements and the observed photoluminescence.

Characterization of New SBT Sol System and its thin film on the Platinum Electrode for Fram Application

1997 ◽  
Vol 493 ◽  
Author(s):  
YongSoo Choi ◽  
WooSik Kim ◽  
ChangEun Kim ◽  
WhanSik Yoo ◽  
BaeYeon Kim ◽  
...  
Keyword(s):  
Thin Film ◽  
Heat Treatment ◽  
Grain Size ◽  
Platinum Electrode ◽  
Chelating Agent ◽  
Si Substrate ◽  
Electrode Area ◽  
Average Grain Size

ABSTRACTStable SBT sols for FRAM application were made from Sr-isopropoxide, Bi-acetate, and Ta-ethoxide with 2-ethoxyethanol as a solvent and chelating agent, TEA. The sol were spin-on coated on the Pt /Ti/SiO2/Si substrate. From the IR and DTA/TGA, the 2-ethoxyethanol -triethanolamine sol system is quite stable against aging. 5% excess Bi added sol and 800°C heat treatment of the thin film revealed the most crystallinity. There is a change in the orientation of thin film above 800°C heat treatment from c-axis to(105). The average grain size of thin film is very small, i.e., 40 nm at 800°C, and it has very narrow distributions, and the thickness of the coating were about 100nm, which would promise smaller electrode area and higher yield.

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