The role of A-site cation size mismatch in tune the catalytic activity and durability of double perovskite oxides

2020 ◽  
Vol 270 ◽  
pp. 118868 ◽  
Author(s):  
Shengli Pang ◽  
Jie Xu ◽  
Yanjing Su ◽  
Gongmei Yang ◽  
Meng Zhu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Double Perovskite ◽  
Perovskite Oxides ◽  
Size Mismatch ◽  
A Site ◽  
Cation Size

Insights into the role of strontium in toluene catalytic combustion over La1-xSrxCoO3 perovskites catalysts

2022 ◽  
Author(s):  
Mo Liu ◽  
Xiaoli Yang ◽  
ZiMeng Tian ◽  
Huimin Wang ◽  
Liangtao Yin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Combustion ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
A Site

A series of LaCoO3 pervoskite catalysts substituted by Sr in A site (La1-xSrxCoO3) were prepared via a facile sol-gel method. The catalytic activity of these pervoskite catalysts for the deep...

scholarly journals Spontaneous atomic ordering and magnetism in epitaxially stabilized double-perovskites

2012 ◽  
Vol 1454 ◽  
pp. 3-13
Author(s):  
Akira Ohtomo ◽  
Suvankar Chakraverty ◽  
Hisanori Mashiko ◽  
Takayoshi Oshima ◽  
Masashi Kawasaki
Keyword(s):  
Magnetic Properties ◽  
Transition Metals ◽  
Double Perovskite ◽  
Perovskite Oxides ◽  
Epitaxial Films ◽  
Atomic Ordering ◽  
Magnetic Ground State ◽  
Half Metallic ◽  
Optical Band Gaps

ABSTRACTWe report on the atomic ordering of B-site transition-metals and magnetic properties in double-perovskite oxides, La2CrFeO6 (LCFO) and La2VMnO6 (LVMO), which have never been reported to exist in ordered forms. These double-perovskite oxides are particularly interesting because of possible ferromagnetism (expected from the Kanamori-Goodenough rule for LCFO) and half-metallic antiferromagnetism (predicted for LVMO). Using pulsed-laser deposition technique with single solid-solution targets, we have prepared epitaxial films in ordered forms. Despite similar ionic characters of constituent transition-metals in each compound, the maximum B-site order attained was surprisingly high, ∼90% for LCFO and ∼80% for LVMO, suggesting a significant role of epitaxial stabilization in the spontaneous ordering process. Magnetization and valence state characterizations revealed that the magnetic ground state of both compounds was coincidently ferrimagnetic with saturation magnetization of ∼2μBper formula unit, unlike those predicted theoretically. In addition, they were found to be insulating with optical band-gaps of 1.6 eV and 0.9 eV for LCFO and LVMO, respectively. Our results present a wide opportunity to explore novel magnetic properties of binary transition-metal perovskites upon epitaxial stabilization of the ordered phase.

scholarly journals Structural and Electrical Properties of Ca2+ Doped LaFeO3: The Effect of A-site Cation Size Mismatch

2020 ◽  
Vol 10 (2) ◽  
pp. 5538-5546
Author(s):  
A. E. Irmak
Keyword(s):  
Crystal Structure ◽  
Sol Gel ◽  
Charge Ordering ◽  
Room Temperature Resistivity ◽  
Size Mismatch ◽  
Ca Doping ◽  
Average Size ◽  
A Site ◽  
Cation Size ◽  
Small Polarons

In this study, nanosized La1-xCaxFeO3 (0.00≤x≤0.40) compounds prepared via sol-gel method followed by heat treatment at 1100oC for 24 hours are studied. Crystal structure, microstructure, surface morphology and temperature-dependent resistivity of the samples are investigated. TEM investigation reveals nanoparticles with an average size of 35nm produced from the sol-gel process. The crystal structure of the compounds belongs to an orthorhombically distorted perovskite structure with Pbnm space group. Lattice distortion and cation size mismatch increase with an increase in Ca and particle and grain growth are suppressed by Ca doping. Electrical conduction is explained via thermally activated hopping of small polarons. Unit cell volume, charge ordering temperature, and activation energy for small polarons decrease linearly with an increase in cation size mismatch. Room temperature resistivity decreases with Ca doping and gets its minimum value for 30% Ca at which the orthorhombic distortion is maximum.

scholarly journals A class of rare antiferromagnetic metallic oxides: double perovskite AMn3V4O12 (A = Na+, Ca2+, and La3+) and the site-selective doping effect

2015 ◽  
Vol 17 (19) ◽  
pp. 12717-12721 ◽  
Author(s):  
Guangbiao Zhang ◽  
Yuanxu Wang ◽  
Zhenxiang Cheng ◽  
Yuli Yan ◽  
Chengxiao Peng ◽  
...  
Keyword(s):  
Double Perovskite ◽  
Perovskite Oxides ◽  
Doping Effect ◽  
Selective Doping ◽  
Metallic Oxides ◽  
A Site ◽  
Site Selective

A-site-ordered double perovskite oxides will work as an ideal platform for designing novel antiferromagnetic metallic oxides.

Highly active hydrogen evolution catalysis on oxygen-deficient double-perovskite oxide PrBaCo2O6−δ

2020 ◽  
Vol 4 (5) ◽  
pp. 1519-1529 ◽  
Author(s):  
Hayato Togano ◽  
Kaisei Asai ◽  
Seiji Oda ◽  
Hidekazu Ikeno ◽  
Shogo Kawaguchi ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Oxygen Deficiency ◽  
Double Perovskite ◽  
Perovskite Oxides ◽  
Perovskite Oxide ◽  
Cation Ordering ◽  
Active Hydrogen ◽  
Multiple Factors ◽  
Highly Active ◽  
A Site

Oxygen-deficient double perovskite oxides PrBaCo2O6−δ exhibit highly active hydrogen evolution reaction catalysis, which is associated with multiple factors: oxygen deficiency, high Co valence, and A-site cation ordering.

Effect of A-site cation size mismatch on charge ordering behavior in (La1−xYx)0.5(Ca1−ySry)0.5MnO3

2001 ◽  
Vol 90 (1) ◽  
pp. 488-492 ◽  
Author(s):  
Y. Q. Wang ◽  
Ian Maclaren ◽  
X. F. Duan ◽  
Z. H. Wang ◽  
B. G. Shen
Keyword(s):  
Charge Ordering ◽  
Size Mismatch ◽  
A Site ◽  
Cation Size
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