scholarly journals High stability of electro-transport and magnetism against the A-site cation disorder in SrRuO3

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Y. L. Wang ◽  
M. F. Liu ◽  
R. Liu ◽  
Y. L. Xie ◽  
X. Li ◽  
...  
Keyword(s):  
High Stability ◽  
Cation Disorder ◽  
A Site

Effects of A-site cation disorder on structure and magnetocaloric properties in Y and Sr codoped La2∕3Ca1∕3MnO3 compounds

2009 ◽  
Vol 105 (7) ◽  
pp. 07D713 ◽  
Author(s):  
Qing Ji ◽  
Bin Lv ◽  
P. F. Wang ◽  
H. L. Cai ◽  
X. S. Wu ◽  
...  
Keyword(s):  
Cation Disorder ◽  
Magnetocaloric Properties ◽  
A Site

A Theoretical Investigation on the Adsorption of CH4 onto the Surfaces of BaZrO3

2011 ◽  
Vol 268-270 ◽  
pp. 210-213
Author(s):  
Zi Shu Gao ◽  
Yi Guo Su ◽  
Li Lv ◽  
Shu Wei Wang ◽  
Hui Han ◽  
...  
Keyword(s):  
Density Functional ◽  
High Stability ◽  
Energy State ◽  
Absorption Mechanism ◽  
Functional Theory ◽  
Fundamental Understanding ◽  
Key Factor ◽  
Adsorption Surface ◽  
A Site ◽  
Structure Calculations

In this paper, a density functional theory based on the first-principles was employed to evaluate the adsorption of CH4onto the surfaces of BaZrO3catalysts. The absorption mechanism was derived by population and electronic states analysis on the basis of the electronic and surface structure calculations for BaZrO3. The (001) surface was calculated to be the adsorption surface for CH4owing to its high stability. Comparing to that for CH4absorbed on (001) surfaces, the frontier energy state was found to the key factor in controlling the adsorption behavior, which is mainly contributed by oxygen and Zr ions of the B-site. The most favorite adsorption site for CH4was located at B-sites of BaZrO3, where the A-site ions would adjust the charge of B-site ions and moreover affect the CH4adsorption. The results reported in this work may provide the fundamental understanding about the absorption of CH4inflammation catalysts with high-activity and high-stability.

PHASE SEPARATION INDUCED BY CATION DISORDER IN (La, Y)2/3(Sr, Ca)1/3MnO3

2011 ◽  
Vol 25 (11) ◽  
pp. 1501-1509
Author(s):  
A. M. ZHANG ◽  
H. L. CAI ◽  
X. S. WU ◽  
Z. H. WANG ◽  
J. GAO
Keyword(s):  
Phase Separation ◽  
Hole Concentration ◽  
Transition Width ◽  
Cation Disorder ◽  
Metal To Insulator Transition ◽  
Metal State ◽  
Phase Separation Behavior ◽  
A Site ◽  
Separation Behavior ◽  
Large Cation

Polycrystalline manganite oxides with different A-site cation disorder were synthesized. The hole concentration and average radius of A-site cation are kept unchanged while the A-site cation disorder increases linearly by Y and Sr co-doped in La 2/3 Ca 1/3 MnO 3. All these samples exhibit a paramagnetic insulator to ferromagnetic (FM) metal transition, and the transition temperature T C and T MI decrease while the transition width increases with increasing the A-site cation disorder. T MI is usually 10 K higher than T C for the small cation disorder samples. However, with increasing the cation disorder, T MI is about 60 K lower than T C , and the resistivity increases in magnitude while the magnetization decreases. The metal-to-insulator transition for samples with small cation disorder can be well described by a percolative model, which indicates FM-metal state and antiferromagnetic insulator state assuredly coexist in the transition interval. It reveals that cation disorder suppresses the long-range FM-metal state which results in the phase separation behavior in samples with large cation disorder.

scholarly journals Bismuth Substituted Strontium Cobalt Perovskites for Catalyzing Oxygen Evolution

2019 ◽  
Author(s):  
Denis Kuznetsov ◽  
Jiayu Peng ◽  
Livia Giordano ◽  
Yuriy Román-Leshkov ◽  
Yang Shao-Horn
Keyword(s):  
Fermi Level ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Rational Design ◽  
High Stability ◽  
Inductive Effect ◽  
Specific Activity ◽  
Band Center ◽  
Highly Active ◽  
A Site

In this study, we employ the strategy of substitution with more electronegative/acidic A-site ions in the cobalt perovskites to alter O 2p-band center, surface hydroxide affinity, and oxygen evolution reaction (OER) activity and stability in the basic electrolyte. Galvanostatically charged Bi<sub>0.2</sub>Sr<sub>0.8</sub>CoO<sub>3-δ</sub> (δ close to zero) was shown to exhibit record OER specific activity exceeding not only La<sub>x</sub>Sr<sub>1-x</sub>CoO<sub>3-δ</sub> but also charged SrCoO<sub>3-δ</sub> (δ close to zero), one of the most active oxide OER catalysts reported so far. The enhanced OER activity of charged Bi<sub>0.2</sub>Sr<sub>0.8</sub>CoO<sub>3-δ</sub> can be attributed to greater hydroxide affinity facilitating the deprotonation of surface bound intermediates due to the presence of strong Lewis acidic A-site Bi<sup>3+</sup> ions, while the high stability can result from lowered O 2p-band center relative to the Fermi level. This work provides a novel example in the rational design of highly active oxide catalysts for OER by leveraging the inductive effect.

scholarly journals ANALYSIS OF POTENTIAL AND STABILITY ACROSS ENVIRONMENTS OF NINE APPLE ROOTSTOCKS IN THEIR INFLUENCE ON GROWTH AND YIELD

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1173f-1173
Author(s):  
William C. Olien ◽  
David C. Ferree ◽  
Bert L. Bishop
Keyword(s):  
High Stability ◽  
High Potential ◽  
Environmental Stability ◽  
Growth And Yield ◽  
Apple Rootstocks ◽  
Cumulative Yield ◽  
Cross Sectional ◽  
Yield Efficiency ◽  
Regional Project ◽  
A Site

Nine apple rootstocks grafted with `Starkspur Supreme Delicious' were evaluated in 19 states over 9 to 10 years by the NC 140 Regional Project as a randomized complete block with 10 replications in each site. Effects on trunk cross-sectional area (TA), cumulative yield per tree (Yc), and cumulative yield efficiency (YEc=Yc/TA) were evaluated. Rootstock differences in mean potential (mean performance at the mean site) and environmental stability (slope across sites) were compared by analysis of rootstock performance within a site linearly regressed on mean performance of all rootstock in that site. MAC 24 had the highest mean potential of Yc and TA with lowest stability, giving this rootstock the highest Yc and TA in best sites, and lowest in poor sites. M.27 EMLA was the opposite, having low potential and high stability in Yc and TA. In YEc, M.27 EMLA and MAC9 had high potential and low stability, while OAR1, M.7 EMLA, and especially MAC 24 were the opposite. YEc of Ott.3 and M.26 were average in both respects. M.9 had high potential YEc with average stability. M.9 EMLA was unique in having both high potential and high stability of YEc.

Effect of A-site cation disorder on charge ordering and ferromagnetism of La0.5Ca0.5−yBayMnO3

2002 ◽  
Vol 248 (2) ◽  
pp. 348-354 ◽  
Author(s):  
V.N. Smolyaninova ◽  
S.E. Lofland ◽  
C. Hill ◽  
R.C. Budhani ◽  
Z. Serpil Gonen ◽  
...  
Keyword(s):  
Charge Ordering ◽  
Cation Disorder ◽  
A Site

scholarly journals Thermal Conductivity of A-Site Cation-Deficient La-Substituted SrTiO3 Produced by Spark Plasma Sintering

2015 ◽  
Vol 2 (1-2) ◽  
Author(s):  
Thomas E. Loland ◽  
Jaran Sele ◽  
Mari-Ann Einarsrud ◽  
Per Erik Vullum ◽  
Mats Johnsson ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Spark Plasma Sintering ◽  
High Temperatures ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
High Stability ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
A Site

AbstractDuring the last decade oxide-based thermoelectric materials have received increased attention due to their high stability and thermal robustness at high temperatures as well as the availability and nontoxic nature of a number of promising candidates. In the present study we are investigating the thermoelectric properties of an n-type La-substituted SrTiO

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