Tuneability of Sm(1−)Ce FeO3± perovskites: Thermal stability and electrical conductivity

Bukhari, Syed M.; Giorgi, Javier B.

doi:10.1016/j.ssi.2008.12.002

Cited by 44 publications

(44 citation statements)

References 34 publications

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“…The total conductivity was also verified by the 4 point method and previously reported [30]. Pellets (diameter = 6 mm, thickness = 2 mm) of Sm 1-x Ce xFeO 3--d (x = 0, 0.01 and 0.05) were made by pressing 2 g of powder to 15,000 lbs and sintering in air at 1200°C for 4 h with ramp rates of 2°C/min.…”

Section: Conductivity Measurements Of Perovskitesmentioning

confidence: 74%

“…The solution was dried at 120°C for 24 h resulting in a citrate gel precursor that was subsequently ground and calcined at 850°C for 24 h with ramp rates of 5°C/min, yielding the dark orange perovskite powders. The stoichiometry of the doped materials was verified by XRF, their structure exhibited a single perovskite phase in air up to 1350°C and they had specific surface areas a s typically in the range of 6.0-8.0 m 2 /g [30].…”

Section: Synthesis Of the Smfeo 3 Perovskite Familymentioning

confidence: 94%

“…The basic preparation and characterization of these perovskites have been previously reported [30]. Starting materials included samarium nitrate (Sm(NO 3 ) 3 Á6H 2 O, Alfa Aesar, 99.9 %), cerium nitrate hexahydrate (Ce(NO 3 ) 3 Á6H 2 O, Alfa Aesar, 99.5 %), iron nitrate nonahydrate (Fe(NO 3 ) 3 Á9H 2 O, Alfa Aesar, [98 %), and citric acid monohydrate (Alfa Aesar, minimum 99 %).…”

Section: Synthesis Of the Smfeo 3 Perovskite Familymentioning

confidence: 99%

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Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation

et al. 2015

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The novel Sm 1-x Ce x FeO 3-d (x = 0, 0.01, 0.05) (SCF) perovskites with and without 1 wt% of Pt nanoparticles (NPs) were investigated for carbon monoxide and ethylene oxidation in the temperature range of 25-350°C. All perovskites were predominantly ionic conductors, with ionic conductivities two orders of magnitude higher than the electronic contribution. Furthermore, the cerium doping increases the ionic conductivity of these materials at high temperatures. The bare SCF perovskites possessed catalytic activity for both reactions; however the Pt-supported catalysts had 50-100°C lower light-off temperatures than the corresponding perovskites. More significantly, the enhancement in the catalytic activity of the Pt/SCF family with respect to other Pt-supported catalysts was shown by the lower activation energies, which were 25.7 kJ/mol over Pt/Sm 0.95 Ce 0.05 FeO 3-d and 18.3 kJ/mol over Pt/Sm 0.99 Ce 0.01 FeO 3-d for CO and ethylene oxidation, respectively. The corresponding activation energies for Pt NPs supported on conventional cAl 2 O 3 were 57.1 and 32 kJ/mol, and on ionically conductive yttria-stabilized zirconia (YSZ) were 35.8 and 22 kJ/mol for CO and C 2 H 4 oxidation, respectively. The increased activity was attributed to the high ionic conductivity (O 2-) of the perovskite supports at 100-400°C that facilitates the spontaneous backspillover of O 2-promoters from the lattice to the gas-exposed Pt nanoparticle surface. The promoters alter the adsorption strength of reactants similar to the electrochemical promotion mechanism observed under polarization.

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Section: Conductivity Measurements Of Perovskitesmentioning

confidence: 74%

Section: Synthesis Of the Smfeo 3 Perovskite Familymentioning

confidence: 94%

Section: Synthesis Of the Smfeo 3 Perovskite Familymentioning

confidence: 99%

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Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation

et al. 2015

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“…The responses of SmFeO 3 device was decreased with increasing operating temperature from 400˚C to 500˚C. This seems come from the p-type semi-conductive property and the coverage of oxygen ions of the perovskite-type oxides, because the adsorbed oxygen ions are reduced by reduction reaction on the surface with causing the release of electrons in the perovskites [27][28][29]. Table 1 the results would be expressed that surface-controlled gas sensor based oxide semiconductor is to be high conductivity by increasing working temperature.…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

Fabrication of Sm-Based Perovskite-Type Oxide Thin-Films and Gas Sensing Properties to Acetylene

Tasaki¹,

Takase²

2012

JST

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Sm-based perovskite-type oxide (SmMeO 3 : Me = Cr, Mn, Fe, Co) thin-films could be synthesized by a wet-chemical method using an acetylacetone-Poly(Vinyl Pyrrolidone) (PVP) polymeric precursor method at 750˚C. The perovskitetype oxide thin-films were tried to apply an acetylene gas sensor based on AC impedance spectroscopy. Among the oxides tested, SmFeO 3 thin-film sensor showed good sensor responses in which the AC impedance at 20 kHz was depending on acetylene gas concentration between 2 ppm and 80 ppm at 400˚C.

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“…Recently, a number of methods have been used to prepare ultrapure and ultrafine ReFeO 3 nanoparticles, such as high-energy ball milling [6], solid-state reaction [14], thermal decomposition [15], sonochemical method [16], hydrothermal process [17], and self-ignited sol-gel method [18]. The structure and properties of these materials are strongly influenced by the synthesis processing of its precursor particles, so much attention has been paid on the improvement of preparation method.…”

Section: Introductionmentioning

confidence: 99%

Manganese substitution effects in SmFeO3 nanoparticles fabricated by self-ignited sol–gel process

Shen

2015

J Sol-Gel Sci Technol

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Through the optimization of process, a series of orthorhombic perovskite SmFe 1-x Mn x O 3 (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) nanoparticles were readily prepared by selfignited sol-gel process. The Mn substitution effects on the structure, morphology and magnetic properties of SmFeO 3 have been investigated in detail. Pure phase orthorhombic SmFeO 3 is calcinated at 900°C for 3 h. By the introduction of Mn 3? , the synthesis temperature of orthorhombic perovskite-type SmFe 1-x Mn x O 3 particles has been lowered to be around 700°C. At room temperature, weak ferromagnetic behavior is observed at SmFeO 3 which is caused by its canted antiferromagnetic ordering. In the SmFe 1-x Mn x O 3 system for x B 0.15, the weak ferromagnetic interactions are effectively enhanced with increasing Mn 3? , showing increased magnetization and coercive field. However, for SmFe 0.8 Mn 0.2 O 3 and SmFe 0.75 Mn 0.25 O 3 , the weak ferromagnetic couplings begin to decrease. SmFe 0.85 Mn 0.15 O 3 displays the strongest ferromagnetic behavior. This peculiar behavior is ascribed to the complex magnetic interactions between Mn and Fe ions. Graphical Abstract A series of orthorhombic perovskite SmFe 1-x Mn x O 3 (0 B x B 0.25) nanopowders were readily prepared by self-ignited sol-gel process. The calcination temperature has been lowered to be around 700°C by the introduction of Mn 3? . SmFe 0.85 Mn 0.15 O 3 displays the strongest ferromagnetic behavior. The tunability of the magnetic characteristics of SmFe 1-x Mn x O 3 is ascribed to the complex magnetic interactions between Mn and Fe ions.

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Tuneability of Sm(1−)Ce FeO3± perovskites: Thermal stability and electrical conductivity

Cited by 44 publications

References 34 publications

Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation

Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation

Fabrication of Sm-Based Perovskite-Type Oxide Thin-Films and Gas Sensing Properties to Acetylene

Manganese substitution effects in SmFeO3 nanoparticles fabricated by self-ignited sol–gel process

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