Study of the phase stability of La0.6Sr0.4MnO3 – δ oxide with mixed oxygen-electron conductivity

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Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

This work is devoted to the study of thermodynamic characteristics and phase stability of oxides with a perovskite structure using both classical and original methods for studying compounds of similar composition. An oxide with mixed oxygen-electron conductivity La0.6Sr0.4MnO3 – δ obtained by solid-phase synthesis was chosen as the object of research. The stoichiometric range of this composition has been established at temperatures of 600 – 900 оC in the region of oxygen partial pressure up to 3*10–4 atm. The chemical potential of oxygen in the gas phase is calculated, as well as the dependences of the partial molar enthalpy and entropy of oxygen in the oxide in the nonstoichiometry range δ=0.01 – 0.012.

Толық мәтін

Рұқсат жабық

Авторлар туралы

R. Guskov

Institute of Solid State Chemistry and Mechanochemistry SB RAS

Хат алмасуға жауапты Автор.
Email: rostislav.guskov@yandex.ru
Ресей, Novosibirsk

M. Popov

Institute of Solid State Chemistry and Mechanochemistry SB RAS

Email: rostislav.guskov@yandex.ru
Ресей, Novosibirsk

I. Kovalev

Institute of Solid State Chemistry and Mechanochemistry SB RAS

Email: rostislav.guskov@yandex.ru
Ресей, Novosibirsk

A. Nemudry

Institute of Solid State Chemistry and Mechanochemistry SB RAS

Email: rostislav.guskov@yandex.ru
Ресей, Novosibirsk

Әдебиет тізімі

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2. Fig. 1. Diagram of the setup for measuring the dependences of the partial pressure of oxygen on the nonstoichiometry of oxides with mixed oxygen-electronic conductivity.

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3. Fig. 2. X-ray diffraction pattern of the composition La0.6Sr0.4MnO3-δ, obtained at room temperature, calculated using the Rietveld method.

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4. Fig. 3. Thermogravimetric curves of the La0.6Sr0.4MnO3-δ composition (the blue line indicates primary cooling, the red line indicates secondary heating); differential scanning calorimetry data (dotted lines: blue – heat flow data during cooling, red – during heating).

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5. Fig. 4. Dependences of the nonstoichiometry of the La0.6Sr0.4MnO3 – δ composition on the partial pressure of oxygen at different temperatures; thermogravimetric analysis data at pO2 = 0.2 atm; literature data Mizusaki et. al. [32].

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6. Fig. 5. 3D dependences of the nonstoichiometry of the La0.6Sr0.4MnO3 – δ composition on the partial pressure of oxygen at different temperatures; purple cubes indicate the boundary points of the region with intense release of weakly bound oxygen; the region is highlighted in green.

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7. Fig. 6. Thermodynamic factors TFO (a) and TFV (b), obtained from equilibrium isothermal simulations log pO2–3 - δ – T.

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8. Fig. 7. LSM oxide stoichiometry as a function of the chemical potential of oxygen in the oxide. The dotted line indicates the isostoichiometric region (δ = 0.01–0.012) of the composition at different temperatures.

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9. Fig. 8. Dependences of the partial molar enthalpy (H(δ)) and entropy (S(δ)) of oxygen in LSM oxide on its stoichiometry in the isostoichiometric range δ = 0.01–0.012.

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