scholarly journals In-situ x-ray diffraction studies on post-deposition vacuum-annealing of ultra-thin iron oxide films

2011 ◽  
Vol 110 (10) ◽  
pp. 102208 ◽  
Author(s):  
F. Bertram ◽  
C. Deiter ◽  
K. Pflaum ◽  
M. Suendorf ◽  
C. Otte ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Vacuum Annealing ◽  
Oxide Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Oxide Films ◽  
Post Deposition

Dissolution of Thin Iron Oxide Films Used as Models for Iron Passive Films Studied by In Situ X‐Ray Absorption Near‐Edge Spectroscopy

1997 ◽  
Vol 144 (1) ◽  
pp. 198-204 ◽  
Author(s):  
Sannakaisa Virtanen ◽  
Patrik Schmuki ◽  
Alison J. Davenport ◽  
Carissima M. Vitus
Keyword(s):  
Iron Oxide ◽  
Oxide Films ◽  
Passive Films ◽  
X Ray ◽  
Iron Oxide Films ◽  
X Ray Absorption

Accelerated Thermal Decomposition of Graphene Oxide Films in Air via in Situ X-ray Diffraction Analysis

2016 ◽  
Vol 120 (27) ◽  
pp. 14984-14990 ◽  
Author(s):  
Qin Pan ◽  
Ching-Chang Chung ◽  
Nanfei He ◽  
Jacob L. Jones ◽  
Wei Gao
Keyword(s):  
Thermal Decomposition ◽  
Graphene Oxide ◽  
Diffraction Analysis ◽  
Oxide Films ◽  
X Ray Diffraction ◽  
X Ray

Residual Stresses in Sputtered ZnO Films on (100) Si Substrates by XRD

2009 ◽  
Vol 1201 ◽  
Author(s):  
Florine Conchon ◽  
Pierre-Olivier Renault ◽  
Philippe Goudeau ◽  
Eric Le Bourhis ◽  
Elin Sondergard ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Annealing Temperature ◽  
Protective Coatings ◽  
Zno Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Si Substrates ◽  
Thermally Activated ◽  
Post Deposition

AbstractResidual stresses in sputtered ZnO films on Si are investigated and discussed. By means of X-ray diffraction, we show that as-deposited ZnO films encapsulated or not by Si3N4 protective coatings are highly compressively stressed. Moreover, a transition of stress is observed as a function of the post-deposition annealing temperature. After a heat treatment at 800°C, ZnO films are tensily stressed while ZnO films encapsulated by Si3N4 are stress-free. With the aid of in-situ X-ray diffraction, we argue that this thermally-activated stress relaxation can be attributed to a variation of the chemical composition of the ZnO films.

Formation and characterization of crystalline iron oxide films on self-assembled organic monolayers and their in situ patterning

2001 ◽  
Vol 16 (2) ◽  
pp. 564-569 ◽  
Author(s):  
Hyunjung Shin ◽  
Jong Up Jeon ◽  
Y. Eugene Pak ◽  
Hyejin Im ◽  
Eung Soo Kim
Keyword(s):  
Iron Oxide ◽  
Microcontact Printing ◽  
Oxide Films ◽  
Thin Layers ◽  
Organic Monolayers ◽  
Selective Deposition ◽  
Si Substrates ◽  
Self Assembled ◽  
Iron Oxide Films

Crystalline and pore-free films of α–Fe2O3 were prepared on hydrophilic self-assembled organic monolayers (DTT-SAMs) at 80 °C. Subsequently, Fe3O4 and γ–Fe2O3 films were synthesized via post annealing of as-deposited α–Fe2O3. In situ patterning of crystalline iron oxide thin layers was achieved via microcontact printing (μCP) and selective deposition. μCP was used to pattern two different surface moieties of self-assembled organic monolayers (SAMs) on Au–Cr–Si substrates. An elastomeric stamp was used to transfer either hexadecanethiol (HDT) SAMs, which are to sustain deposition of iron oxide precipitates, or hydrophilic SAMs [e.g., dithiothreitol (DTT)]. Selective deposition was realized through precipitation of iron oxide phases. Iron oxide films were deposited onto hydrophilic SAMs, but not onto HDT surfaces. Line (width of <1 μm) patterns in crystalline α–Fe2O3 thin films were obtained.

Fabrication of in situ patterned iron oxide films

1999 ◽  
Author(s):  
Hyunjung Shin ◽  
Kyongmi Lee ◽  
Geunbae Lim ◽  
Jong Up Jeon ◽  
Y.E. Pak
Keyword(s):  
Iron Oxide ◽  
Oxide Films ◽  
Iron Oxide Films

scholarly journals Using in-situ techniques to probe high-temperature reactions: thermochemical cycles for the production of synthetic fuels from CO2 and water

2012 ◽  
Vol 27 (2) ◽  
pp. 117-125 ◽  
Author(s):  
Eric N. Coker ◽  
Mark A. Rodriguez ◽  
Andrea Ambrosini ◽  
James E. Miller ◽  
Ellen B. Stechel
Keyword(s):  
Iron Oxide ◽  
Inert Atmosphere ◽  
Solar Thermal Energy ◽  
X Ray Diffraction ◽  
Synthetic Fuels ◽  
Thermochemical Cycles ◽  
X Ray ◽  
In Situ Techniques ◽  
Dissolved Iron

Ferrites are promising materials for enabling solar-thermochemical cycles. Such cycles utilize solar-thermal energy to reduce the metal oxide, which is then re-oxidized by H2O or CO2, producing H2 or CO, respectively. Mixing ferrites with zirconia or yttria-stabilized zirconia (YSZ) greatly improves their cyclabilities. In order to understand this system, we have studied the behavior of iron oxide/8YSZ (8 mol-% Y2O3 in ZrO2) using in situ X-ray diffraction and thermogravimetric analyses at temperatures up to 1500 °C and under controlled atmosphere. The solubility of iron oxide in 8YSZ measured by XRD at room temperature was 9.4 mol-% Fe. The solubility increased to at least 10.4 mol-% Fe when heated between 800 and 1000 °C under inert atmosphere. Furthermore iron was found to migrate in and out of the 8YSZ phase as the temperature and oxidation state of the iron changed. In samples containing >9.4 mol-% Fe, stepwise heating to 1400 °C under helium caused reduction of Fe2O3 to Fe3O4 to FeO. Exposure of the FeO-containing material to CO2 at 1100 °C re-oxidized FeO to Fe3O4 with evolution of CO. Thermogravimetric analysis during thermochemical cycling of materials with a range of iron contents showed that samples with mostly dissolved iron utilized a greater proportion of the iron atoms present than did samples possessing a greater fraction of un-dissolved iron oxides.

Oxygen Gettering Effect During the Reactive Evaporation of Manganese Oxide Films

1999 ◽  
Vol 14 (4) ◽  
pp. 1653-1657 ◽  
Author(s):  
Masaaki Isai ◽  
Katsuma Yamaguchi ◽  
Haruhiko Iyoda ◽  
Hiroshi Fujiyasu ◽  
Yasumitsu Ito
Keyword(s):  
Manganese Oxide ◽  
Photoelectron Spectroscopy ◽  
Oxide Films ◽  
Rapid Change ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lithium Secondary Batteries ◽  
Reactive Evaporation ◽  
Mn Oxide

Manganese oxide films for lithium secondary batteries were prepared using a reactive evaporation method. Mn was evaporated from a molybdenum boat by resistive heating and deposited on a glass slide under oxygen atmosphere. These films were examined with x-ray photoelectron spectroscopy (XPS) and x-ray diffraction. The Mn oxide films with a wide valency of Mn were prepared in this study. A rapid change of the back pressure was found as the deposition of Mn was started. This implies that Mn atoms start to react with O2. This means that in situ detection of reactive evaporation process can be utilized.

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