Electrical properties and water incorporation in A-site deficient perovskite La1−Ba Nb3O9−0.5

Анимица, И. Е.; Iakovleva, Anastasia; Belova, Ksenia

doi:10.1016/j.jssc.2016.03.023

Cited by 9 publications

(3 citation statements)

References 41 publications

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“…This band is frequently reported in complex perovskites, and is ascribed to an A 1g octahedral breathing like mode of the oxygens. According to the literature, this band appears either when two cations of different size/valence are competing on the B site (Cairns et al 2005), or in some A site doped perovskites presenting either A site vacancies (Lowndes et al 2013), B site vacancies (Moraes et al 2011) or oxygen vacancies (Animitsa et al 2016). In any of the A site doping cases, the mode arises from local octahedral distortion and thus disruption of the long range ordering in the B sublattice.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Structural investigations of neodymium incorporation in calcium stannate perovskite CaSnO3

Goethals¹,

Fourdrin²,

Tarrida³

et al. 2018

Phys Chem Minerals

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Samples of calcium stannate perovskite (CaSnO 3 ) doped with a variable Nd content were synthesized by solid-state reaction in the system (1 − x)CaSnO 3 − xNd 2 O 3 . The synthesized compounds were characterized by means of electron microprobe, powder X-ray diffraction, single-crystal X-ray diffraction and µ-Raman spectroscopy. The incorporation of Nd in the CaSnO 3 Pbnm structure leads to the formation of a complex (Ca 1 − 2x Nd 2x )(Sn 1 − x Ca x )O 3 perovskite. The A sublattice contains a random distribution of Ca and Nd in the whole range of composition of this system. For x < 0.28, the structure is Pbnm with Ca and Sn randomly distributed in the B sublattice. For x > 0.28 a symmetry change occurs; the structure turns into rock salt type P2 1 /n. In this latter case half of the octahedral sites are fully occupied by Sn and the other half is randomly occupied by Sn and Ca. For x = 0.28, both structures are present in the sample. The presence of a Raman two modes behavior of A 1g symmetry located near 700 cm − 1 coupled with the continuous linear evolution of the lattice parameters with Nd incorporation supports the proposed substitution mechanism.

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Section: Raman Spectroscopymentioning

confidence: 99%

Structural investigations of neodymium incorporation in calcium stannate perovskite CaSnO3

Goethals¹,

Fourdrin²,

Tarrida³

et al. 2018

Phys Chem Minerals

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“…Proton conducting ceramics have attracted much interest due to their possible applications in energy conversion, as protonic ceramic fuel cells (PCFC), proton ceramic electrolyzer cells (PCEC), hydrogen sensors, and chemical synthesis [1]. Among them, several distinctive groups can be listed: materials based on barium cerate-zirconate solid solutions [2], rare earth niobates [3,4], as well as other materials, e.g., calcium zirconate, rare earth tungstates, and lanthanum ytterbium oxide [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Terbium Substituted Lanthanum Orthoniobate: Electrical and Structural Properties

et al. 2019

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The results of electrical conductivity studies, structural measurements and thermogravimetric analysis of La1−xTbxNbO4+δ (x = 0.00, 0.05, 0.1, 0.15, 0.2, 0.3) are presented and discussed. The phase transition temperatures, measured by high-temperature x-ray diffraction, were 480 °C, 500 °C, and 530 °C for La0.9Tb0.1NbO4+δ, La0.8Tb0.2NbO4+δ, and La0.7Tb0.3NbO4+δ, respectively. The impedance spectroscopy results suggest mixed conductivity of oxygen ions and electron holes in dry conditions and protons in wet. The water uptake has been analyzed by the means of thermogravimetry revealing a small mass increase in the order of 0.002% upon hydration, which is similar to the one achieved for undoped lanthanum orthoniobate.

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“…Some of these phases belong to the class of mixed ionic(protonic)-electronic conductors or MIECs [23][24][25][26]: Ln 6−х MoO 12−δ , Ln 2 ScTaO 7−δ , Ln 6 WO 12−δ . An additional series of primarily lanthanum-based materials can show predominant proton conductivity under certain conditions [27][28][29][30][31]: La 2 Zr 2 O 7 , LaNbO 4 , LaNb 3 O 9 , LaREO 3 (RE = Sc, Y, Yb). Among these, LaYO 3 and LaYbO 3 are positioned as promising proton-conducting electrolytes [32][33][34][35], having been successfully utilised in such electrochemical systems as hydrogen sensors and hydrogen pumps [36,37].…”

Section: Introductionmentioning

confidence: 99%

Densification, morphological and transport properties of functional La1–xBaxYbO3– ceramic materials

Kasyanova

Lyagaeva

Фарленков

et al. 2020

Journal of the European Ceramic Society

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The effective operation of protonic ceramic electrochemical cells requires the design of electrolytes having not only high ionic conductivity, but also excellent stability with respect to carbonisation. In the present work, the La-based oxides (La 1-x Ba x YbO 3-δ, 0.03 ≤ x ≤ 0.10) are proposed as a possible alternative to the convenient Ba (Ce,Zr)O 3-based electrolytes due to their high chemical stability. It was discovered that Ba-doping results in a deterioration of sintering behaviour; as a result, the relative density decreases and open porosity appears (for x = 0.10). A thorough analysis of transport properties by means of AC and DC measurement techniques enables a selection of the La 0.97 Ba 0.03 YbO 3-δ sample, which demonstrates the highest conductivity compared with those samples where x = 0.5 and 0.10. Due to its excellent densification behaviour, stability and ionic conductivity, La 0.97 Ba 0.03 YbO 3-δ can be considered as a promising proton-conducting electrolyte in the La-based family.

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Electrical properties and water incorporation in A-site deficient perovskite La1−Ba Nb3O9−0.5

Cited by 9 publications

References 41 publications

Structural investigations of neodymium incorporation in calcium stannate perovskite CaSnO3

Structural investigations of neodymium incorporation in calcium stannate perovskite CaSnO3

Terbium Substituted Lanthanum Orthoniobate: Electrical and Structural Properties

Densification, morphological and transport properties of functional La1–xBaxYbO3– ceramic materials

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