Structural and property investigations of Strontium Galloniobate

McColm, T.; Irvine, John T. S.

doi:10.1016/s0167-2738(02)00395-8

Cited by 14 publications

(7 citation statements)

References 7 publications

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“…Interestingly, there does not appear to be any obvious trend in the final weight loss, despite the variances in both structure and anion lattice occupancy. The small weight gain under oxidizing conditions is temperature dependent and, given the magnitude, is attributed to the buoyancy effect that is common in TGA investigations. − A thermogram that is corrected for the buoyancy effect is provided in the Supporting Information and exhibits weight gains of <0.3%, which is within instrumental uncertainty. Thus, the Ga 3– x In 3 Ti x O 9 + x/2 system is extremely resilient with regard to oxidation, but is susceptible to reduction at elevated temperatures.…”

Section: Resultsmentioning

confidence: 94%

A Rutile Chevron Modulation in Delafossite-Like Ga_3–xIn₃Ti_xO_9+x/2

et al. 2016

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The structure solution of the modulated, delafossite-related, orthorhombic Ga3-xIn3TixO9+x/2 for x = 1.5 is reported here in conjunction with a model describing the modulation as a function of x for the entire system. Previously reported structures in the related A3-xIn3TixO9+x/2 (A = Al, Cr, or Fe) systems use X-ray diffraction to determine that the anion lattice is the source of modulation. Neutron diffraction, with its enhanced sensitivity to light atoms, offers a route to solving the modulation and is used here, in combination with precession electron diffraction tomography (PEDT), to solve the structure of Ga1.5In3Ti1.5O9.75. We construct a model that describes the anion modulation through the formation of rutile chevrons as a function of x. This model accommodates the orthorhombic phase (1.5 ≤ x ≤ 2.1) in the Ga3-xIn3TixO9+x/2 system, which transitions to a biphasic mixture (2.2 ≤ x ≤ 2.3) with a monoclinic, delafossite-related phase (2.4 ≤ x ≤ 2.5). The optical band gaps of this system are determined, and are stable at ∼3.4 eV before a ∼0.4 eV decrease between x = 1.9 and 2.0. After this decrease, stability resumes at ∼3.0 eV. Resistance to oxidation and reduction is also presented.

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Section: Resultsmentioning

confidence: 94%

A Rutile Chevron Modulation in Delafossite-Like Ga_3–xIn₃Ti_xO_9+x/2

et al. 2016

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“…This is the most commonly used technique and was used for (La 0.75 Sr 0.25 )Cr 0.5 Mn 0.5 OO 3−δ anode followed by a technique of combustion synthesis . La 0.7 Sr 0.3 VO 3 anode, Ce(Mn,Fe)O 2 anode, La(Sr)Fe(Mn)O 3 anode, Sr 0.88 Y 0.08 TiO 3 (YST), Mo‐Ni‐S anode, La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3 anode, Sr 0.6 Ti 0.2 Nb 0.8 O 3 anode, Sr 0.4 Ba 0.2 Ti 0.2 Nb 0.8 O 3 anode, Sr 0.2 Ba 0.4 Ti 0.2 Nb 0.8 O 3 anode, Ba 0.4 Ca 0.2 Ti 0.2 Nb 0.8 O 3 anode, Ba 0.6 Ti 0.2 Nb 0.8 O 3 anode, Sr 2 GaNbO 6 anode, Ba 0.6 Mn 0.067 Nb 0.933 O 3 anode, Ba 0.4 La 0.2 Mn 0.133 Nb 0.867 O 3 anode, Ba 0.4 Sr 0.2 Mn 0.067 Nb 0.933 O 3 anode, Ba 0.6 Ni 0.067 Nb 0.933 O 3 anode, Ba 0.4 La 0.2 Ni 0.133 Nb 0.867 O 3 anode, Ba 0.4 La 0.2 Mn 0.133 Nb 0.867 O 3 anode, Ba 0.6 Fe 0.1 Nb 0.9 O 3 anode, Ba 0.4 La 0.2 Fe 0.2 Nb 0.8 O 3 anode, Ba 0.5 La 0.1 Fe 0.2 Nb 0.8 O 3 anode, Ba 0.4 Ca 0.2 Fe 0.1 Nb 0.9 O 3 anode, Ba 0.4 Sr 0.2 Fe 0.1 Nb 0.9 O 3 anode, Ba 0.6 In 0.1 Nb 0.9 O 3 anode, Ba 0.4 Sr 0.2 In 0.1 Nb 0.9 O 3 anode, Ba 0.4 La 0.2 In 0.2 Nb 0.8 O 3 anode, Ba 0.6 Cr 0.1 Nb 0.9 O 3 anode, Ba 0.6 Sn 0.2 Nb 0.8 O 3 anode, SrMn 0.5 Nb 0.5 O 3−δ anode, Sr 2 Mn 0.8 Nb 1.2 O 6 anode, SrCu 0.4 Nb 0.6 O 2.9 anode, Sr 0.88 Y 0.08 TiO 3 anode, Sr 0.85 Y 0.15 Ti 0.95 Ca 0.05 O 3 anode, Sr 0.85 Y 0.15 Ti 0.95 Co 0.05 O 3 anode, Sr 0.85 Y 0.15 Ti 0.95 Zr 0.05 O 3 anode, Sr 0.85 Y 0.15 Ti 0.95 Mg 0.05 O 3 anode, and Sr 0.88 Y 0.08 TiO 3 anode were prepared by this method.…”

Section: Methods For Synthesis Of Sofc Anodesmentioning

confidence: 99%

“…In this method, the starting materials are dissolved in a certain solvent, completely mixed and stirred continuously at an appropriate temperature. Finally, the precipitates are synthesized by adding dilute NH 4 OH in 1:1 ratio, KOH, and NaOH solutions . These precipitates are washed with water and absolute ethanol, placed in air and dried .…”

Section: Methods For Synthesis Of Sofc Anodesmentioning

confidence: 99%

Material and method selection for efficient solid oxide fuel cell anode: Recent advancements and reviews

et al. 2018

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Summary The energy crisis has reached to an alarming situation due to increase in population. To overcome the shortfall of energy, solid oxide fuel cell (SOFC) being cheap, clean, and efficient renewable energy source is getting attention for electricity generation. Out of the three main components as anode, electrolyte, and cathode; anode/fuel electrode is an important component of SOFC because it allows the flow of electrons via external circuit to cathode generating the electric current and hence requires high electrical conductivity. In this review, anode materials synthesized until now are reviewed and by careful analysis categorized on the basis of operating temperature, conductivity, electrode polarization resistance, and structure. This comparison and categorization will provide selection criteria for state‐of‐the‐art and highly efficient anode materials for SOFC. In addition, the synthesis methods have been reviewed on the basis of their pros and cons, which will further facilitate the researchers to select the best synthesis method so as to get optimized properties of materials.

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“…The loss of the lattice oxygen within a single-phase chemical compound at a constant temperature could be described through the double exponential decay (eqn (2)) 33 representing the two processes (BULK and nSURF):…”

Section: Reduction Behaviour Under Argonmentioning

confidence: 99%

Red-ox behaviour in the La0.6Sr0.4CoO3±δ-CeO2 system

et al. 2011

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The compositions in the (100 À x)La 0.6 Sr 0.4 CoO 3AEd -xCeO 2 (LSCC) system with 5 # x # 76 are twophase at room temperature. They consist of the modified perovskite with rhombohedral symmetry (R 3c) and modified ceria with fluorite structure (Fm 3m). The cross-dissolution of La, Sr, Co and Ce cations between the initial La 0.6 Sr 0.4 CoO 3AEd (LSC) and CeO 2 takes place and results in the modification of the initial phases. This is particularly important for the modified ceria. The lattice parameter of the modified ceria increases due to the dissolution of La and Sr cations with larger ionic radii, thereby changing noticeably the oxygen sublattice in the fluorite structure. Above 300 C LSCCx composites are three-phase due to the reversible change in the symmetry from rhombohedral (R 3c) to cubic (Pm 3m) within the perovskite phase. Red-ox behaviour of the LSCC composites has been explored under air and argon atmospheres in terms of evolution of the chemical composition at the grain's surface and phase interfaces, formation of oxygen vacancies and thermochemistry of this process. Reversible red-ox behaviour was observed in LSCCx with x ¼ 8-37 most probably due to an observed high surface concentration of Co cations, that can be easily involved in the reduction/re-oxidation cycle. The increase in the surface concentration of Ce 4+ cations together with the decrease in surface concentration of Co cations seems to result in the differences in the reduction and oxidation behaviour under air in LSCCx with x ¼ 57-76. Formation of oxygen vacancies in LSC, LSCC02 and LSCCx with x ¼ 5-76 in air was not accompanied by any distinct thermal events. This process becomes more endothermic with further increase in oxygen nonstoichiometry (d) above certain values: d > 0.08 in LSC, d > 0.13 in LSCC02, and LSCC with x ¼ 5-76. The LSCCx with x ¼ 5-37 and with x ¼ 57-76 show slightly different reduction behaviour under a(o 2 ) ¼ 7.4 Â 10 À5 . In the composites with a relatively low CeO 2 content, the extent of the reduction is proportional to the Co content in a composition, whereas the reduction of the LSCCx with x ¼ 57-76 was more significant than expected. The changes in the enthalpy of oxygen vacancy formation and the kinetics of reduction have been discussed.

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Structural and property investigations of Strontium Galloniobate

Cited by 14 publications

References 7 publications

A Rutile Chevron Modulation in Delafossite-Like Ga_3–xIn₃Ti_xO_9+x/2

A Rutile Chevron Modulation in Delafossite-Like Ga_3–xIn₃Ti_xO_9+x/2

Material and method selection for efficient solid oxide fuel cell anode: Recent advancements and reviews

Red-ox behaviour in the La0.6Sr0.4CoO3±δ-CeO2 system

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Structural and property investigations of Strontium Galloniobate

Cited by 14 publications

References 7 publications

A Rutile Chevron Modulation in Delafossite-Like Ga3–xIn3TixO9+x/2

A Rutile Chevron Modulation in Delafossite-Like Ga3–xIn3TixO9+x/2

Material and method selection for efficient solid oxide fuel cell anode: Recent advancements and reviews

Red-ox behaviour in the La0.6Sr0.4CoO3±δ-CeO2 system

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A Rutile Chevron Modulation in Delafossite-Like Ga_3–xIn₃Ti_xO_9+x/2

A Rutile Chevron Modulation in Delafossite-Like Ga_3–xIn₃Ti_xO_9+x/2