Influences of A-site Partial Substitution for BaCo0.7Fe0.3O3Oxide on Perovskite Structure and Oxygen Permeability

2002 ◽  
Vol 31 (3) ◽  
pp. 344-345 ◽  
Author(s):  
Kazuya Kinoshita ◽  
Hajime Kusaba ◽  
Go Sakai ◽  
Kengo Shimanoe ◽  
Norio Miura ◽  
...  
Keyword(s):  
Perovskite Structure ◽  
Oxygen Permeability ◽  
Partial Substitution ◽  
A Site

A-site cation off-centering contribution on ferroelectricity and piezoelectricity in pseudo-cubic perovskite structure of Bi-based lead-free piezoelectrics

2021 ◽  
Vol 205 ◽  
pp. 114176
Author(s):  
Sangwook Kim ◽  
Hyunwook Nam ◽  
Ichiro Fujii ◽  
Shintaro Ueno ◽  
Chikako Moriyoshi ◽  
...  
Keyword(s):  
Perovskite Structure ◽  
Lead Free ◽  
A Site

scholarly journals A-site magnetism in A-site-ordered perovskite-structure oxides

2011 ◽  
Vol 249 (3) ◽  
pp. 423-434 ◽  
Author(s):  
Yuichi Shimakawa ◽  
Takashi Saito
Keyword(s):  
Perovskite Structure ◽  
A Site

The rich physics of A-site-ordered quadruple perovskite manganites AMn7O12

2021 ◽  
Author(s):  
Alexei A. Belik ◽  
Roger D Johnson ◽  
Dmitry Khalyavin
Keyword(s):  
Perovskite Structure ◽  
Double Exchange ◽  
Perovskite Manganites ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Jahn Teller ◽  
The Rich ◽  
A Site ◽  
Small Polarons

Perovskite-structure AMnO3 manganites played an important role in the development of numerous physical concepts such as double exchange, small polarons, electron-phonon coupling, and Jahn−Teller effects, and they host a variety...

Pressure Effect on Intersite Charge Transfer in A-site-Ordered Double-Perovskite-Structure Oxide

2012 ◽  
Vol 24 (11) ◽  
pp. 2235-2239 ◽  
Author(s):  
You-wen Long ◽  
Takateru Kawakami ◽  
Wei-tin Chen ◽  
Takashi Saito ◽  
Tetsu Watanuki ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Perovskite Structure ◽  
Pressure Effect ◽  
Double Perovskite ◽  
A Site

Fe/Mn-based Perovskite-Type Oxides with Excellent Oxygen Permeability and Reduction Tolerance

2004 ◽  
Vol 835 ◽  
Author(s):  
Yasutake Teraoka ◽  
Hironobu Shimokawa ◽  
Hajime Kusaba ◽  
Kazunari Sasaki
Keyword(s):  
Partial Oxidation ◽  
Synthesis Gas ◽  
Oxygen Permeability ◽  
Membrane Reactors ◽  
Permeation Flux ◽  
Low Oxygen ◽  
Reducing Atmosphere ◽  
A Site ◽  
Perovskite Type ◽  
Perovskite Type Structure

ABSTRACTA family of Co-free, Fe/Mn-based perovskite-type oxides, (Sr, A')(Fe, Mn)O3-δ (A'=La, Ba, Ca), was synthesized, and their oxygen permeability and phase stability in reducing atmosphere were investigated. The substitution of Mn at B site caused the decrease in oxygen permeability. As for the effect of A-site substitution, prominent promotion was observed by the substitution of Ba for 30% of Sr, and Ba0.3Sr0.7FeO3-δ was found to be one of most excellent oxygen permeable materials with the permeation flux of 3.0 cm3(STP) cm−2 min−1 at 900 °C. Reduction tolerance was evaluated by TG measurements in a 5%H2/N2 stream up to 1000 °C. After the TG measurements, crystal structures of La-Sr-Co-Fe-O and Sr-Fe-(Mn)-O perovskites were decomposed or transformed into low oxygen permeable phases, but the perovskite-type structure of Ba-Sr-Fe-(Mn)-O survived. The Fe/Mn-based perovskites with high oxygen permeability and exceeding reduction tolerance could be used as stable membrane materials for membrane reactors catalyzing NO-CH4 reaction and the partial oxidation of CH4 into synthesis gas.

Oxygen permeability of A-site nonstoichiometric BaxCo0.7Fe0.2Nb0.1O3−δ perovskite oxides

2010 ◽  
Vol 181 (5-7) ◽  
pp. 354-358 ◽  
Author(s):  
Hailei Zhao ◽  
Yunfei Cheng ◽  
Nansheng Xu ◽  
Yuan Li ◽  
Fushen Li ◽  
...  
Keyword(s):  
Oxygen Permeability ◽  
Perovskite Oxides ◽  
A Site

The effect of A-site doping in a strontium palladium perovskite and its applications for non-enzymatic glucose sensing

RSC Advances ◽  
2016 ◽  
Vol 6 (20) ◽  
pp. 16183-16196 ◽  
Author(s):  
Ekram H. El-Ads ◽  
Ahmed Galal ◽  
Nada F. Atta
Keyword(s):  
Catalytic Activity ◽  
Glucose Sensing ◽  
Partial Substitution ◽  
A Site

The catalytic activity of a strontium palladium perovskite, Sr2PdO3, toward non-enzymatic glucose sensing is strongly affected by the Sr2+ A-site partial substitution by Ca2+ ions; Sr2−xCaxPdO3 with x = 0–0.7.

scholarly journals Inorganic Co-Crystal Formation and Thermal Disproportionation in a Dicyanometallate 'Superperovskite'

2019 ◽  
Author(s):  
Joshua A. Hill ◽  
Claire A. Murray ◽  
Chiu C. Tang ◽  
Peter M. M. Thygesen ◽  
Amber L. Thompson ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
Perovskite Structure ◽  
Structure Type ◽  
Crystal Formation ◽  
Thermally Driven ◽  
New Type ◽  
A Site ◽  
Inorganic Components

<div> <div> <div> <p>We report the synthesis, crystal structure, and thermally- driven phase transformation of the dicyanometallate super- perovskite co-crystal [NBu4]Mn[Au(CN)2]3·[NBu4]ClO4. This phase is understandable in terms of the conventional ABX3 perovskite structure type, but with the NBu+4 A-site cation displaced onto the perovskite cage face and 1-dimensional AX′ chains included within framework pores opened up by these displacements. On heating to 380K, the co-crystal disproportionates into its two inorganic components: a bcs-structured ABX3 phase and [NBu4 ]ClO4 . This system illustrates a new type of structural and phase complexity accessible to dicyanometallate perovskites. </p> </div> </div> </div>

scholarly journals The Ni Catalyst Supported on the FSP-made Transition Metal (Co, Mn, Cu or Zn) Doped La2O3 Material for the Dry Reforming of Methane

2021 ◽  
Vol 17 (1) ◽  
pp. 88-102
Author(s):  
Phakampai Aunmunkong ◽  
Choowong Chaisuk
Keyword(s):  
Transition Metal ◽  
Perovskite Structure ◽  
Catalyst Surface ◽  
Spinel Phase ◽  
Coke Formation ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Partial Substitution ◽  
Ni Catalyst ◽  
Flame Spray

The transition metal (Co, Mn, Cu or Zn) doped La2O3 material was prepared by flame spray pyrolysis (FSP) technique. The 2 wt.% Ni catalyst supported on this material was characterized by XRD, N2 physisorption, TPR, H2 chemisorption and TGA, and evaluated by the dry reforming of methane (DRM). The perovskite structure was certainly formed when either Co or Mn was introduced. The Cu can generate the La2CuO4 spinel phase while the Zn showed a mixed phase of La2O3, ZnO and La(OH)3. The Ni/Co-La2O3 catalyst was more active for the DRM because of high amount of active dual sites of Ni and Co metals dispersed on the catalyst surface. The formation of La2O2CO3 during the reaction can inhibit the coke formation. The cooperation of La2O2CO3 and MnO phases in the Ni/Mn-La2O3 catalyst was promotional effect to decrease carbon deposits on the catalyst surface. The partial substitution of Co for Mn with a small content of Mn can enhance the catalytic activity and the product yield. The Ni/Mn0.05Co0.95-La2O3 catalyst showed the highest CH4 conversion, H2 yield and H2/CO ratio. The Mn inserted into the perovskite structure of LaCoO3 was an important player to change oxygen mobility within the crystal lattice to maintain a high performance of the catalyst. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

scholarly journals Dielectric and Impedance Studies of (Ba,Ca)TiO3 Ceramics Obtained from Mechanically Synthesized Powders

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4036
Author(s):  
Kamil Feliksik ◽  
Lucjan Kozielski ◽  
Izabela Szafraniak-Wiza ◽  
Tomasz Goryczka ◽  
Małgorzata Adamczyk-Habrajska
Keyword(s):  
Mechanochemical Synthesis ◽  
Calcium Ion ◽  
Perovskite Structure ◽  
Calcium Concentration ◽  
Perovskite Phase ◽  
Economic Benefits ◽  
Ambient Conditions ◽  
Ceramic Samples ◽  
A Site ◽  
Stoichiometry Control

Mechanochemical synthesis offers unique possibility of perovskite phase formation at ambient conditions that is very attractive (simplifies production, allows strict stoichiometry control and brings economic benefits). In this work the mechanochemical synthesis has been used for preparation ofBa1−xCaxTiO3 (0.2 ≤ x ≤ 0.3) powders from simple oxides. The 20 h milled powders have been uniaxially pressed and sintered in order to get the ceramic samples. The sample morphologies have been observed by scanning electron microscopy. Dielectric and impedance studies have been performed on ceramics. The obtained results indicate that the two mechanism of doping occurred. The first one is observed for the lower calcium concentration (below 0.3) and consists of the introduction of calcium ion into the A site of the perovskite structure. The second one is observed for the higher calcium concentration (equal 0.3). In this case the calcium ions partially occupies the B site in the perovskite structure. Both cases have different influence on the final properties of the ceramics because they induce different defects.

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