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1.801 Aktuelle Fachpublikationen zum Thema temperature

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Formation of Tetravalent Fe Ions in LaFeO3 Perovskite Through Mechanochemical Modification by Ball Milling

19.02.2015 | Tomoki Uchiyama, Maiko Nishibori, Hisahiro Einaga, Yasutake Teraoka, Journal of the American Ceramic Society, 2015

Mechanochemical modification of previously synthesized LaFeO3 perovskite‐type oxide by a high‐energy ball milling was investigated to introduce Fe4+ ions or transform some Fe3+ into Fe4+ in LaFeO3. X‐ray absorption fine structure studies revealed that the formation of Fe4+ ions into LaFeO3 ...

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Mesospheric Removal of Very Long-Lived Greenhouse Gases SF6 and CFC-115 by Metal Reactions, Lyman-α Photolysis, and Electron Attachment

19.02.2015 | Anna Totterdill; Tamás Kovács; Juan Carlos Gómez Martín; Wuhu Feng; John M. C. Plane, Journal of Physical Chemistry A, 2015

The fluorinated gases SF6 and C2F5Cl (CFC-115) are chemically inert with atmospheric lifetimes of many centuries which, combined with their strong absorption of IR radiation, results in unusually high global warming potentials. Very long lifetimes imply that mesospheric sinks could make important ...

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Shock-Tube Measurement of Acetone Dissociation Using Cavity-Enhanced Absorption Spectroscopy of CO

16.02.2015 | Shengkai Wang; Kai Sun; David F. Davidson; Jay B. Jeffries; Ronald K. Hanson, Journal of Physical Chemistry A, 2015

A direct measurement for the rate constant of the acetone dissociation reaction (CH3COCH3 = CH3CO + CH3) was conducted behind reflected shock wave, utilizing a sub-ppm sensitivity CO diagnostic achieved by cavity-enhanced absorption spectroscopy (CEAS). The current experiment eliminated the ...

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Structural and Optical Properties of Electrodeposited Porous SnO2 Films: Effect of Applied Potential and Post Deposition Annealing Treatment

23.01.2015 | Sandeep A. Arote, Vilas Tabhane, Shashikant D. Gunjal, Kakasaheb C. Mohite, Habib Pathan, Macromolecular Symposia, 2015

Summary Nanocrystalline SnO2 film was prepared by cathodic electrodeposition method and its structure and optical properties were studied by X‐ray diffraction, scanning electron microscopy and UV–visible spectroscopy. The effects of applied potential and post deposition annealing on the ...

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Terahertz Spectroscopy of 2,4-Dinitrotoluene over a Wide Temperature Range (7–245 K)

07.01.2015 | Lucia M. Lepodise; Joseph Horvat; R. A. Lewis, Journal of Physical Chemistry A, 2015

Previous THz spectroscopy of the TNT explosive precursor, 2,4-dinitrotoluene (DNT), has been restricted to room temperature (apart from one set of data at 11 K). Here, for the first time, we investigate the spectrum as the temperature is systematically varied, from 7 to 245 K. Many new features ...

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Influence of selenization temperature on synthesis, morphology, and properties of nanostructured CoSe2 films

03.01.2015 | Jen‐Bin Shi, Po‐Feng Wu, Chia‐Tze Kao, Ming‐Way Lee, Chih‐Chieh Chan, Ping‐Chang Yang, Cheng‐Li Lin, Rui‐Yo Huang, Y ..., Crystal Research and Technology, 2015

Nanostructured cobalt selenide (CoSe2) thin films were deposited on a glass substrate using the selenization of Co films at different selenization temperatures (300 °C, 400 °C, and 500 °C) in a pure Se vapor for two hours. The morphology and structure of the as‐deposited films shows that the ...

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X‐ray Absorption Spectroscopy Studies of the Room‐Temperature Ferromagnetic Fe‐Doped 6H–BaTiO3

31.12.2014 | Iuliia Mikulska, Matjaz Valant, Iztok Arčon, Darja Lisjak, Journal of the American Ceramic Society, 2014

We investigated the effect of annealing temperature on magnetic properties of 2% and 10% Fe‐doped BaTiO3. To understand the possible structural differences between samples treated at different annealing temperatures, and to correlate them with the magnetic properties, several characterization ...

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Strong Electron Hybridization and Fermi-to-Non-Fermi Liquid Transition in LaCu3Ir4O12

30.12.2014 | Man-Rong Li; Maria Retuerto; Zheng Deng; Tapati Sarkar; Javier Sánchez-Benítez; Mark C. Croft; Tanusri Saha Dasgupta ..., Chemistry of Materials, 2014

The AA′3B4O12-type quadruple perovskite LaCu3Ir4O12 prepared at high pressure (9 GPa) and temperature (1523 K) crystallizes in cubic symmetry (Im3̅, a = 7.52418(3) Å) with square planar CuO4 and octahedral IrO6 coordination as established from synchrotron powder X-ray diffraction studies. Both ...

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Structural Studies of 1,1-Dimethyl-2-oxy-1-silacyclohexane by Means of Matrix Isolation Infrared Absorption Spectroscopy

30.12.2014 | Justinas Ceponkus; Mindaugas Jonusas; Colin P. Cotter; Milda Pucetaite; Valdemaras Aleksa; Gamil A. Guirgis; Valdas ..., Journal of Physical Chemistry A, 2014

Infrared spectra of gaseous, liquid, and matrix-isolated samples of newly synthesized 1,1-dimethyl-2-oxy-1-silacyclohexane were recorded. Raman spectra of 1,1-dimethyl-2-oxy-1-silacyclohexane in liquid and solid states were obtained in the temperature range from 170 to 340 K. Ab initio HF and DFT ...

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Evolution of Silver Nanoparticles in the Rat Lung Investigated by X-ray Absorption Spectroscopy

30.12.2014 | R. Andrew Davidson; Donald S. Anderson; Laura S. Van Winkle; Kent E. Pinkerton; T. Guo, Journal of Physical Chemistry A, 2014

Following a 6-h inhalation exposure to aerosolized 20 and 110 nm diameter silver nanoparticles, lung tissues from rats were investigated with X-ray absorption spectroscopy, which can identify the chemical state of silver species. Lung tissues were processed immediately after sacrifice of the ...

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