Development and Application of In-Situ, Real Time and Ex-Situ Characterization Techniques to Study the Growth of High Temperature Superconducting (HTSC) Films and Interfaces,

1997 ◽  
Author(s):  
Eugene A. Irene ◽  
O. Auciello ◽  
A. R. Krauss ◽  
G. E. McGuire
Keyword(s):  
High Temperature ◽  
Real Time ◽  
Ex Situ ◽  
High Temperature Superconducting ◽  
Characterization Techniques

Real-Time Analysis Of In-Situ Spectroscopic Ellipsometric Data During Mbe Growth Of III-V Semiconductors

1991 ◽  
Vol 222 ◽  
Author(s):  
B. Johs ◽  
J. L. Edwards ◽  
K. T. Shiralagi ◽  
R. Droopad ◽  
K. Y. Choi ◽  
...  
Keyword(s):  
Real Time ◽  
Optical Constants ◽  
Growth Parameters ◽  
Ex Situ ◽  
Time Analysis ◽  
Mbe Growth ◽  
In Situ Data ◽  
Real Time Analysis

ABSTRACTA modular spectroscopic ellipsometer, capable of both in-situ and ex-situ operation, has been used to measure important growth parameters of GaAs/AIGaAs structures. The ex-situ measurements provided layer thicknesses and compositions of the grown structures. In-situ ellipsometric measurements allowed the determination of growth rates, layer thicknesses, and high temperature optical constants. By performing a regression analysis of the in-situ data in real-time, the thickness and composition of an AIGaAs layer were extracted during the MBE growth of the structure.

scholarly journals Tracing Phase Transformation and Lattice Evolution in a TRIP Sheet Steel under High-Temperature Annealing by Real-Time In Situ Neutron Diffraction

Crystals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 360 ◽  
Author(s):  
Dunji Yu ◽  
Yan Chen ◽  
Lu Huang ◽  
Ke An
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Real Time ◽  
Retained Austenite ◽  
Sheet Steel ◽  
Carbon Diffusion ◽  
Structure Evolution ◽  
In Situ Neutron Diffraction

Real-time in situ neutron diffraction was used to characterize the crystal structure evolution in a transformation-induced plasticity (TRIP) sheet steel during annealing up to 1000 °C and then cooling to 60 °C. Based on the results of full-pattern Rietveld refinement, critical temperature regions were determined in which the transformations of retained austenite to ferrite and ferrite to high-temperature austenite during heating and the transformation of austenite to ferrite during cooling occurred, respectively. The phase-specific lattice variation with temperature was further analyzed to comprehensively understand the role of carbon diffusion in accordance with phase transformation, which also shed light on the determination of internal stress in retained austenite. These results prove the technique of real-time in situ neutron diffraction as a powerful tool for heat treatment design of novel metallic materials.

La0.67Sr0.33MnO3 nanofibers for in situ, real-time, and stable high temperature oxygen sensing

RSC Advances ◽  
2012 ◽  
Vol 2 (9) ◽  
pp. 3872 ◽  
Author(s):  
Yixin Liu ◽  
Yu Ding ◽  
Haiyong Gao ◽  
Lichun Zhang ◽  
Puxian Gao ◽  
...  
Keyword(s):  
High Temperature ◽  
Real Time ◽  
Oxygen Sensing

Grazing Incidence X-Ray Scattering Studies of the Structure and Morphology of the Ni/Mgo(001), Co/Nio(111) and Nife/Nio(111) Interfaces During their in Situ Growth

1999 ◽  
Vol 562 ◽  
Author(s):  
G. Renaud ◽  
A. Barbier ◽  
C. Mocuta
Keyword(s):  
High Temperature ◽  
Magnetic Measurements ◽  
Grazing Incidence ◽  
Ex Situ ◽  
Crystallographic Structure ◽  
Temperature Oxidation ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

ABSTRACTCombined in situ structural and ex situ magnetic studies of the Co/NiO(111) and Ni81Fe19/NiO(111) interfaces are presented. The Co and Permalloy films were grown on NiO(111) single crystals. Structural studies were performed by Grazing Incidence X-ray Scattering during growth. The effect of the temperature of the substrate during deposition was investigated. Under specific growth conditions, almost pure FCC Co and NiFe films can be obtained, with small quantities of twins. Magnetic measurements were performed ex situ by Magneto-Optical Kerr Effect (MOKE). A strong correlation between the magnetic properties and the crystallographic structure of the Co film is evidenced. High coercive fields are measured for all samples. High temperature annealing of the NiFe film leads to an improved crystalline quality, but the interface becomes reactive and diffuse: part of the Fe diffuses into the NiO substrate and forms an interface compound, likely to be the spinel NiFe2O4. We also report an in situ grazing incidence X-ray scattering study of the Ni/MgO(001) interface during its formation at room temperature. In-plane measurements reveal that the interface is sharp and that the epitaxial relationship is complex. Two distinct lattices are found to exist: expanded Ni(001) and Ni(110). The latter exhibits several orientations with respect to the substrate depending on the thickness. The Ni(110) orientations disappear by annealing at high temperature, leaving only the Ni cube/cube orientation. The layer was also almost fully transformed into NiO(001) by high temperature oxidation.

Probing the stability of Pt nanoparticles encapsulated in sol–gel Al 2 O 3 using in situ and ex situ characterization techniques

2014 ◽  
Vol 485 ◽  
pp. 108-117 ◽  
Author(s):  
R.U. Ribeiro ◽  
D.M. Meira ◽  
C.B. Rodella ◽  
D.C. Oliveira ◽  
J.M.C. Bueno ◽  
...  
Keyword(s):  
Sol Gel ◽  
Pt Nanoparticles ◽  
Ex Situ ◽  
Characterization Techniques ◽  
The Stability

scholarly journals Ammonia-Rich High-Temperature Superconducting Intercalates of Iron Selenide Revealed through Time-Resolved in Situ X-ray and Neutron Diffraction

2014 ◽  
Vol 136 (2) ◽  
pp. 630-633 ◽  
Author(s):  
Stefan J. Sedlmaier ◽  
Simon J. Cassidy ◽  
Richard G. Morris ◽  
Michael Drakopoulos ◽  
Christina Reinhard ◽  
...  
Keyword(s):  
High Temperature ◽  
Neutron Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Iron Selenide ◽  
High Temperature Superconducting

Adaptive Process Control and In-Situ Diagnostics for High Temperature PEM MEA Manufacturing

2010 ◽  
Author(s):  
Justin Gullotta ◽  
Lakshmi Krishnan ◽  
Dylan Share ◽  
Daniel Walczyk ◽  
Raymond Puffer
Keyword(s):  
High Temperature ◽  
Real Time ◽  
Complex Impedance ◽  
Impedance Measurement ◽  
Proton Exchange ◽  
Unit Process ◽  
Adaptive Process ◽  
In Situ Diagnostics ◽  
High Temperature Pem

The most critical step in high temperature proton exchange membrane (PEM) MEA manufacturing is sealing of the membrane between the two electrodes. This sealing process is typically conducted using a precision hydraulic thermal press. In order to achieve cost-effective high-volume MEA manufacturing, it is important to reduce the variability in MEA performance due to variations in incoming material properties and dimensions, and to reduce the unit process cycle time. This paper explains the application of real time adaptive process controls (APC) combined with effective in-situ diagnostics during the MEA sealing process to achieve greater uniformity and performance of high temperature PEM MEAs. The in-situ impedance measurement is carried out in a precision thermal press using a milliohmmeter by reading the complex impedance of the MEA at 1 kHz as the components of the MEA are sealed. This signal is then used to adjust the pressing process parameters in real time to achieve more uniform MEA performance. An experiment was carried out in an attempt to identify the impedance parameter which correlated most closely with the MEA’s future performance. Using these impedance parameters during pressing, we are able to reliably produce MEAs using the real time APC technique that perform consistently in a single cell test fixture with more than a 50% reduction in pressing time.

Sign in / Sign up

Export Citation Format

Share Document