scholarly journals Is the surface oxygen exchange rate linked to bulk ion diffusivity in mixed conducting Ruddlesden–Popper phases?

2015 ◽  
Vol 182 ◽  
pp. 113-127 ◽  
Author(s):  
Alex C. Tomkiewicz ◽  
Mazin A. Tamimi ◽  
Ashfia Huq ◽  
Steven McIntosh
Keyword(s):  
Exchange Rate ◽  
Exchange Rates ◽  
Ion Mobility ◽  
Surface Composition ◽  
Large Body ◽  
High Sensitivity ◽  
Oxygen Exchange ◽  
Surface Oxygen ◽  
Ion Scattering ◽  
Surface Exchange

The possible link between oxygen surface exchange rate and bulk oxygen anion diffusivity in mixed ionic and electronic conducting oxides is a topic of great interest and debate. While a large body of experimental evidence and theoretical analyses support a link, observed differences between bulk and surface composition of these materials are hard to reconcile with this observation. This is further compounded by potential problems with simultaneous measurement of both parameters. Here we utilize separate techniques, in situ neutron diffraction and pulsed isotopic surface exchange, to examine bulk ion mobility and surface oxygen exchange rates of three Ruddlesden–Popper phases, general form An−1A′2BnO3n+1, An−1A′2BnX3n+1; LaSrCo0.5Fe0.5O4−δ (n = 1), La0.3Sr2.7CoFeO7−δ (n = 2) and LaSr3Co1.5Fe1.5O10−δ (n = 3). These measurements are complemented by surface composition determination via high sensitivity-low energy ion scattering. We observe a correlation between bulk ion mobility and surface exchange rate between materials. The surface exchange rates vary by more than one order of magnitude with high anion mobility in the bulk of an oxygen vacancy-rich n = 2 Ruddlesden–Popper material correlating with rapid oxygen exchange. This is in contrast with the similar surface exchange rates which we may expect due to similar surface compositions across all three samples. We conclude that experimental limitations lead to inherent convolution of surface and bulk rates, and that surface exchange steps are not likely to be rate limiting in oxygen incorporation.

Surface Composition/Organization of Ionic Liquids with Au Nanoparticles Revealed by High-Sensitivity Low-Energy Ion Scattering

Langmuir ◽  
2013 ◽  
Vol 29 (46) ◽  
pp. 14301-14306 ◽  
Author(s):  
Alan Kauling ◽  
Günter Ebeling ◽  
Jonder Morais ◽  
Agílio Pádua ◽  
Thomas Grehl ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Au Nanoparticles ◽  
Surface Composition ◽  
High Sensitivity ◽  
Low Energy ◽  
Ion Scattering ◽  
Low Energy Ion Scattering

Surface Oxygen Exchange Kinetics in Oxide-Ion Conducting Solids

1992 ◽  
Vol 293 ◽  
Author(s):  
Bernard A. Boukamp ◽  
H.J.M. Bouwmeester ◽  
H. Verweij ◽  
A.J. Burggraaf
Keyword(s):  
Dissociative Adsorption ◽  
Oxygen Exchange ◽  
Surface Oxygen ◽  
Surface Exchange ◽  
Oxygen Ion ◽  
Exchange Kinetics ◽  
Ion Conducting ◽  
Singly Charged ◽  
Rate Limiting ◽  
Ion Conducting Solids

AbstractThe surface oxygen exchange on oxides with high oxygen ion mobility is modelled with a two step reaction with adsorbed mono-atomic oxygen species as intermediate. Interpretation of the Po2 dependence of the exchange rates, following from this model, indicates that these adsorbed oxygen atoms are singly charged.For the stabilized δ-Bi2O3 solid electrolyte a good agreement has been found between the isotope exchange model and the electrochemical study of the oxygen exchange using gold electrodes. For the mixed La-Sr cobaltite perovskite a change in the surface exchange reaction is observed going from room temperature to 600°C. Indications are that above 450°C the bulk exchange is rate limiting with a (Po2)−1 dependence while below this temperature it is assumed that the dissociative adsorption is rate limiting with a (Po2)1/2 dependence.

Functionalized Ionic Liquids Sputter Decorated with Pd Nanoparticles

2019 ◽  
Vol 72 (2) ◽  
pp. 49 ◽  
Author(s):  
Muhammad I. Qadir ◽  
Alan Kauling ◽  
Günter Ebeling ◽  
Michael Fartmann ◽  
Thomas Grehl ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Palladium Nanoparticles ◽  
Surface Composition ◽  
Ion Pairs ◽  
High Sensitivity ◽  
Pd Nanoparticles ◽  
Low Energy ◽  
Ion Scattering ◽  
Sputtering Deposition ◽  
Low Energy Ion Scattering

The fabrication of surface clean palladium nanoparticles of 3–4nm was accomplished in imidazolium-based functionalized ionic liquids (ILs) having methoxy, cyano, and thio groups by magnetron sputtering deposition. The size of the NPs was strongly dependent on the surface composition and/or organisation of the ILs. The NP growth apparently occurred preferentially in the bulk of the fluids, whereas nucleation apparently occurred preferentially at the IL surface. Smaller NPs were detected close to the methoxy containing IL surface and were covered by at least one layer of IL ion pairs, as revealed by high-sensitivity low-energy ion scattering (HS-LEIS) measurements.

Fear of Free Floating or Forced Exchange Rate Fixing

2004 ◽  
pp. 112-122
Author(s):  
O. Osipova
Keyword(s):  
Exchange Rate ◽  
Financial Crisis ◽  
Exchange Rates ◽  
Inflation Targeting ◽  
Exchange Rate Policy ◽  
Float Exchange Rate ◽  
Floating Exchange Rate ◽  
Rate Policy ◽  
Exchange Rate Arrangements ◽  
Pass Through

After the financial crisis at the end of the 1990 s many countries rejected fixed exchange rate policy. However actually they failed to proceed to announced "independent float" exchange rate arrangement. This might be due to the "fear of floating" or an irreversible result of inflation targeting central bank policy. In the article advantages and drawbacks of fixed and floating exchange rate arrangements are systematized. Features of new returning to exchange rates stabilization and possible risks of such policy for Russia are considered. Special attention is paid to the issue of choice of a "target" currency composite which can minimize external inflation pass-through.

ANALISIS EKSPOSUR EKONOMI DAN FAKTOR-FAKTOR YANG MEMPENGARUHINYA PADA PERUSAHAAN ROKOK YANG TERCATAT DI BEI

Wahana ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 98-109
Author(s):  
Ida Musdafia Ibrahim ◽  
Arif Haryono
Keyword(s):  
Exchange Rate ◽  
Exchange Rates ◽  
Cash Flow ◽  
Firm Value ◽  
Tobacco Industry ◽  
Cash Flows ◽  
Least Square ◽  
Exchange Rate Risk ◽  
Positive Effects ◽  
Rate Risk

This study aims to analyze economic exposures and its factors namely exchange rates and inflation, that influence firm value as reflected through firm cash flow. Analytical method used Ordinary Least Square and eviews as analytical tool. This study used secondary data and cigarette industry companies listed on the Indonesia Stock Exchange as samples along 2008 to 2017. Samples choosing method used purposive sampling based on determined criterias. The results showed that partially economic exposure had positive effects on firm value but insignificant. These could be seen from the economic exposure factors influncenced namely exchange rates and inflations.The exchange rate risk has low influenced cash flow was caused of the tobacco industry has low level of export/import.Enhance,inflation also had low effect on cash flow was caused of the tendency of cigarette consumers will continue to buy cigarettes even though its price increases. In short, economic exposure in the tobacco industry has low influence toward firms value. Hence, simultaneously changes in exchange rates and inflation which are economic exposure indicators have a significant effect on cash flows.  Keywords: Economic Exposure, Exchange Rate Risk, Inflation Risk, Firms Value, Cash Flow

Exchange Rates as Exchange Rate Common Factors

2012 ◽  
Author(s):  
Ryan Greenaway ◽  
Nelson C. Mark ◽  
Donggyu Sul ◽  
Jyh-Lin Wu
Keyword(s):  
Exchange Rate ◽  
Exchange Rates ◽  
Common Factors

South Africa’s Trade Performance under Alternative Exchange Rate Regimes

2018 ◽  
Vol 10 (6) ◽  
pp. 261
Author(s):  
Romaine Patrick ◽  
Phocenah Nyatanga
Keyword(s):  
South Africa ◽  
Exchange Rate ◽  
Exchange Rates ◽  
Exchange Rate Regime ◽  
Real Exchange Rates ◽  
Series Data ◽  
Growth Strategies ◽  
The Real ◽  
Real Price ◽  
Floating Exchange Rate

This study examined the effect exchange rates have on import and export volumes under alternative exchange rate policies adopted in South Africa over the period 1960 to 2017. Using quarterly time series data for the stated period, a log-linear error correction model is employed to estimate the country’s export and import elasticities, taking into account Gross Domestic Product (GDP), the real price of exports, the real price of imports and real exchange rates. Using the freely floating exchange rate regime as the base period, the study concluded that both export and import volumes are lower under a system of fixed exchange rates. Export and import volumes were also found to be lower under the dual exchange rate regime, relative to the freely floating exchange rate regime. In accordance with export-led growth strategies, exports were found to be higher and imports lower under a managed floating exchange rate regime. It is therefore recommended that South Africa revert to a more managed exchange rate regime, until the South African economy is developed to accommodate a freely floating exchange rate regime.

scholarly journals PENGARUH KURS, GROSS DOMESTIC PRODUCT DAN SOLVABILITAS TERHADAP RETURN SAHAM INVESTOR PADA PERUSAHAAN PERTAMBANGAN

2019 ◽  
Vol 8 (10) ◽  
pp. 6262
Author(s):  
Martina Carissa Dewi ◽  
Luh Gede Sri Artini
Keyword(s):  
Exchange Rate ◽  
Gross Domestic Product ◽  
Exchange Rates ◽  
Stock Returns ◽  
Stock Exchange ◽  
Sampling Technique ◽  
Domestic Product ◽  
Mining Company ◽  
Macroeconomic Factors ◽  
Regression Test

The level of return obtained by investors is influenced by microeconomic and macroeconomic factors. This study aims to obtain empirical evidence regarding the effect of exchange rates, Gross Domestic Product and solvency on stock returns. This research was conducted at the mining company in the coal sub-sector on the Indonesia Stock Exchange. All the coal mining sub-sector companies listed on the Stock Exchange for the period 2014-2017 used as the population. The method of determining the sample used is using a saturated sampling technique. Multiple linear regression test used as the data analysis on this research. Based on the results of the analysis of this study it was found that the exchange rate and GDP had a negative and significant effect on stock returns. The solvency proxied by DER has a positive and significant effect on stock returns. Keywords: Exchange Rate, Gross Domestic Product, Solvability and Return.

scholarly journals Exchange Rates and Monetary Fundamentals: What Do We Learn from Linear and Nonlinear Regressions?

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Guangfeng Zhang
Keyword(s):  
Exchange Rate ◽  
Exchange Rates ◽  
Correction Model ◽  
Exchange Rate Dynamics ◽  
Long Run ◽  
Exchange Rate Movements ◽  
Short Run ◽  
Us Dollar ◽  
Linear And Nonlinear ◽  
Japanese Yen

This paper revisits the association between exchange rates and monetary fundamentals with the focus on both linear and nonlinear approaches. With the monthly data of Euro/US dollar and Japanese yen/US dollar, our linear analysis demonstrates the monetary model is a long-run description of exchange rate movements, and our nonlinear modelling suggests the error correction model describes the short-run adjustment of deviations of exchange rates, and monetary fundamentals are capable of explaining exchange rate dynamics under an unrestricted framework.

Sign in / Sign up

Export Citation Format

Share Document