Thermodynamic stability of ternary oxides in LnMO (Ln = La, Pr, Nd; M = Co, Ni, Cu) systems

Петров, А. Н.; Черепанов, В.А.; Zuyev, A.Yu.; Zhukovsky, V. M.

doi:10.1016/0022-4596(88)90083-7

Cited by 84 publications

(51 citation statements)

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“…In air at 1100 °C phase La 2 CoO 4 is not formed [12,101]. The introduction of alkaline earth metal in the lanthanum sublattice increases the average oxidation state of cobalt in the solid solution (La 1-y M y ) 2 CoO 4 , thereby stabilizing the phase with the structure of the K 2 NiF 4 type [93][94][95][96]102].…”

Section: № 4 | 2015mentioning

confidence: 99%

“…The works on the study of the system Sm-Co-O and properties of oxide phases formed in system were then extended to other rare earth elements (REE) [1][2][3][4][5][6][7][8] and 3d transition metals [9][10][11][12][13]. A characteristic feature of these systems is the formation of oxide phases with perovskite structure AVO 3 and related.…”

Section: Introductionmentioning

confidence: 99%

“…The assignable region of homogeneity La 1-x Ca x CoO 3-d is considerably less than was found for Srand Ba-substituted lanthanum cobaltites. This may be due in part to a dimensional factor, because reducing the size of cation in position А reduces the resistance perovskite phases [100], but mainly with the fact that the valence state of cobalt ions determines the thermodynamic stability of these systems [94].In air at 1100 °C phase La 2 CoO 4 is not formed [12,101] The results of comprehensive study of phase equilibria in systems La-M-Co-O (Ln = Nd, Sm; M = Ca, Ba) are presented in fig. 10, 11, 12 [103, 104].…”

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confidence: 99%

“…In air at 1100 °C phase La 2 CoO 4 is not formed [12,101] The results of comprehensive study of phase equilibria in systems La-M-Co-O (Ln = Nd, Sm; M = Ca, Ba) are presented in fig. 10, 11, 12 [103, 104].…”

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Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

et al. 2015

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Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of.Review is dedicated studies of phase equilibria in the systems based on rare earth elements and 3d transition metals. It's highlighted several structural families of these compounds and is shown that many were found interesting properties for practical application, such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases, the high mobility in the oxygen sublattice and more.Keywords: phase equilibrium; manganites; isobaric-isothermal diagrams; solid solutions © Cherepanov V. A., Gavrilova L. Ya., Volkova N. E., Urusova A. S., Aksenova T. V., Kiselev E., 2015 IntroductionThe studies of phase equilibria in the systems based on rare earth elements and 3d transition metals and thermodynamic parameters of the oxide phases formed in these systems was initiated by Vladimir Mikhailovich Zhukovsky in 1977 under the direct supervision of Alexander Nikolaevich Petrov, as the development of contractual issues, conducted with an experienced company GIREDMET. The works on the study of the system Sm-Co-O and properties of oxide phases formed in system were then extended to other rare earth elements (REE) [1][2][3][4][5][6][7][8] and 3d transition metals [9][10][11][12][13]. A characteristic feature of these systems is the formation of oxide phases with perovskite structure AVO 3 and related. The partial substitution of rare earth elements in alkaline earth metals (AEM) leads to significant change of properties and they found a wide range of interesting for practical applications of the properties such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases and a variety of redox reactions, high mobility in the oxygen sublattice and more. In addition, partial substitution in the A-sublattice under constant 3d-cation in the systems Ln-T-O allows to stabilize the structure, which Cherepanov V. A., Gavrilova L. Ya., Volkova N. E., Urusova A. S., Aksenova T. V., Kiselev E. in the given conditions (temperature and oxygen pressure) are thermodynamically unstable. Therefore, further development of investigations of phase equilibria and thermodynamic stability of complex oxides were targeting the systems Ln-M-T-O (where Ln = REE, M = Ca, Sr, Ba; T = Mn, Fe, Co, Ni, Cu). When a certain percentage of similarity (in all possible formation of a phase with perovskite structure LnTO 3±d ) these systems still have a noticeable and distinctive features depending on the nature of the components. Phase equilibrium in systems with T = MnThe significant difference of perovskite phases in the manganese-containing systems Ln-Mn-O is that the oxygen content in them exceeds the stoichiometric air LnMnO 3+d . In fact, the oxygen sublattice is complete and the non-stoichiometry is realized by vacancy disordering ...

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Section: № 4 | 2015mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

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“…Under these conditions, the Mn-Ni-O system contains Mn 3 O 4 -and NiO-based solid solutions: [9]. The La-Ni-O system in air at 1100 ° C contains three perovskite-like phases: La 2 NiO 4 , La 3 Ni 2 O 7 , and La 4 Ni 3 O 10 [10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Two more mixed oxides in this system were obtained under other conditions: LaNiO 3 (below 900 ° C in air or at elevated oxygen pressures [22][23][24][25][26]) and La 6 Ni 5 O 15 (at 1200 ° C in…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria and Crystal Structures of Mixed Oxides in the La-Mn-Ni-O System

Demina¹,

Черепанов²,

Петров³

et al. 2005

Inorg Mater

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The phase equilibria and crystal structures of mixed oxides in the ternary system La 2 O 3 -Mn 3 O 4 -NiO are studied at 1100 ° C in air. The projection of the La-Mn-Ni-O phase diagram at 1100 ° C and = 0.21 × 10 5 Pa onto the metal-composition triangle is found to comprise 12 phase fields. The lattice parameters of La 2 NiO 4 (sp. gr. I 4/ mmm ), La 3 Ni 2 O 7 (sp. gr. Cmcm ), La 4 Ni 3 O 10 (sp. gr. Cmca ), and La 1 + x Mn 1 -x -y Ni y O 3 solid solutions (sp. gr. Pnma , -0.04 ≤ x ≤ 0.05, 0 ≤ y ≤ 0.4) are determined. The composition stability limits of La 4 Ni 3 -y Mn y O 10 solid solutions are 0 < y ≤ 0.05. With increasing Ni concentration in La 1 + x Mn 1 -x -y Ni y O 3 , the metal nonstoichiometry decreases from -0.04 ≤ x ≤ 0.05 at y = 0 to x = 0 at y = 0.4. p O 2

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Phase Equilibria of the System La2O3–NiO–Li2O at 700, 800, and 900°C

Yang

Fan

et al. 1998

Journal of Solid State Chemistry

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Thermodynamic stability of ternary oxides in LnMO (Ln = La, Pr, Nd; M = Co, Ni, Cu) systems

Cited by 84 publications

References 14 publications

Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

Phase Equilibria and Crystal Structures of Mixed Oxides in the La-Mn-Ni-O System

Phase Equilibria of the System La2O3–NiO–Li2O at 700, 800, and 900°C

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