Structure and phase transitions of (La, Sr)(Ga, Mg)O3?? solid electrolyte

Шкерин, С. Н.; Бронин, Д. И.; Kovyazina, S. A.; Горелов, В. П.; Кузьмин, А. В.; Martem’yanova, Z. S.; Береснев, С. М.

doi:10.1016/s0167-2738(03)00309-6

Cited by 16 publications

(5 citation statements)

References 21 publications

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“…Several studies have been made on the crystal structure of LSGM by neutron powder diffraction 15-20 and Raman spectroscopy. − The crystal structures of LSGM systems have been strongly dependent upon the doped Sr and/or Mg contents. Namely, Slater et al, , Boysen et al, and Vasylechko et al reported that La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 (LSGM9182) crystallized in the monoclinic with space group I 2/ a , while Kajitani et al reported that La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 2.8 (LSGM8282) crystallized in the cubic with space group Pm 3̄ m , which is an ideal perovskite structure, i.e., the prototype structure.…”

Section: Resultsmentioning

confidence: 99%

In Situ Neutron Diffraction Study on Fast Oxide Ion Conductor LaGaO₃-Based Perovskite Compounds

et al. 2005

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The crystal structures of LaGaO3, LaGa0.9Mg0.1O2.95, and La0.9Sr0.1Ga0.9Mg0.1O2.9 have been investigated by high-temperature neutron powder diffraction in order to clarify a mechanism for high oxide ion conduction properties in LaGaO3-based compounds. Parent phase LaGaO3 crystallized in the orthorhombic (Pbnm) up to 150 °C and the rhombohedral (R3̄c) at between 160 and 800 °C. LaGa0.9Mg0.1O2.95 crystallized in the orthorhombic (Ibmm) up to 340 °C and the rhombohedral (R3̄c) at between 350 and 800 °C. On the other hand, La0.9Sr0.1Ga0.9Mg0.1O2.9 crystallized in the monoclinic (I2/a) up to 400 °C and the rhombohedral (R3̄c) at between 410 and 800 °C. The correlations between the crystal structures and conduction properties of LaGaO3-based materials were discussed on the basis of the analytical results.

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Section: Resultsmentioning

confidence: 99%

In Situ Neutron Diffraction Study on Fast Oxide Ion Conductor LaGaO₃-Based Perovskite Compounds

et al. 2005

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“…It has been reported that densification of LSGM powder compacts requires high temperatures (>1400 • C). 14 16 Thus, sintering at temperatures >1400 • C is not desired. 17 Ga loss constitutes a severe problem in terms of the ionic conductivity of the material.…”

Section: Introductionmentioning

confidence: 99%

X-ray single phase LSGM at 1350°C

Öncel

Özkaya

Gülgün

2007

Journal of the European Ceramic Society

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“…At the same time, high-temperature neutron diffraction data indicate monoclinic distortions of the LSGM crystal lattice at low temperatures, leading to a series of structural transitions from the pseudo-orthorhombic to the rhombohedral phase [ 35 ]. There are also indications of two second-order phase transitions near 500 and 600 °C, accompanied by changes in the oxygen sublattice and the conductivity activation energy [ 36 ]. The average TEC values were obtained by linear approximation in two temperature regions and are shown in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

Highly Conductive Fe-Doped (La,Sr)(Ga,Mg)O3−δ Solid-State Membranes for Electrochemical Application

et al. 2023

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Membranes based on complex solid oxides with oxygen-ionic conductivity are widely used in high-temperature electrochemical devices such as fuel cells, electrolyzers, sensors, gas purifiers, etc. The performance of these devices depends on the oxygen-ionic conductivity value of the membrane. Highly conductive complex oxides with the overall composition of (La,Sr)(Ga,Mg)O3 have regained the attention of researchers in recent years due to the progress in the development of electrochemical devices with symmetrical electrodes. In this research, we studied how the introduction of iron cations into the gallium sublattice in (La,Sr)(Ga,Mg)O3 affects the fundamental properties of the oxides and the electrochemical performance of cells based on (La,Sr)(Ga,Fe,Mg)O3. It was found that the introduction of iron leads to an increase in the electrical conductivity and thermal expansion in an oxidizing atmosphere, while no such behavior was observed in a wet hydrogen atmosphere. The introduction of iron into a (La,Sr)(Ga,Mg)O3 electrolyte leads to an increase in the electrochemical activity of Sr2Fe1.5Mo0.5O6−δ electrodes in contact with the electrolyte. Fuel cell studies have shown that, in the case of a 550 µm-thick Fe-doped (La,Sr)(Ga,Mg)O3 supporting electrolyte (Fe content 10 mol.%) and symmetrical Sr2Fe1.5Mo0.5O6−δ electrodes, the cell exhibits a power density of more than 600 mW/cm2 at 800 °C.

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Structure and phase transitions of (La, Sr)(Ga, Mg)O3?? solid electrolyte

Cited by 16 publications

References 21 publications

In Situ Neutron Diffraction Study on Fast Oxide Ion Conductor LaGaO₃-Based Perovskite Compounds

In Situ Neutron Diffraction Study on Fast Oxide Ion Conductor LaGaO₃-Based Perovskite Compounds

X-ray single phase LSGM at 1350°C

Highly Conductive Fe-Doped (La,Sr)(Ga,Mg)O3−δ Solid-State Membranes for Electrochemical Application

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Structure and phase transitions of (La, Sr)(Ga, Mg)O3?? solid electrolyte

Cited by 16 publications

References 21 publications

In Situ Neutron Diffraction Study on Fast Oxide Ion Conductor LaGaO3-Based Perovskite Compounds

In Situ Neutron Diffraction Study on Fast Oxide Ion Conductor LaGaO3-Based Perovskite Compounds

X-ray single phase LSGM at 1350°C

Highly Conductive Fe-Doped (La,Sr)(Ga,Mg)O3−δ Solid-State Membranes for Electrochemical Application

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In Situ Neutron Diffraction Study on Fast Oxide Ion Conductor LaGaO₃-Based Perovskite Compounds

In Situ Neutron Diffraction Study on Fast Oxide Ion Conductor LaGaO₃-Based Perovskite Compounds