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Inorganics
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Layered Perovskites: Synthesis, Properties and Structures
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Layered Perovskites: Synthesis, Properties and Structures

A special issue of Inorganics (ISSN 2304-6740). This special issue belongs to the section "Inorganic Solid-State Chemistry".

Deadline for manuscript submissions: closed (15 July 2023) | Viewed by 7077

Special Issue Editor

Prof. Dr. Nataliia Tarasova

E-Mail Website
Guest Editor
1. The Institute of High Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, 620066 Ekaterinburg, Russia
2. Institute of Natural Sciences and Mathematics, Ural Federal University, 620000 Yekaterinburg, Russia
Interests: ceramics; layered perovskites; ion conductivity; photovoltaics; photocatalysts; phosphors; superconductors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The layered perovskites can be classified as Ruddlesden–Popper, Dion–Jacobson and Aurivillius structures. Compounds with Ruddlesden–Popper structure have the general formula An+1BnO3n+1 in which the alternation of layers is characteristic perovskite structure (P) and rock salt structure fragments (RS) in sequences –Pn–RS–Pn–RS–, where n is the thickness of the perovskite layer. Aurivillius phases are characterized by the formula An-1Bi2ВnO3n+3, which describes the alternation of perovskite layers with layers having a fluorite structure, formed by bismuth and oxygen ions. Dion–Jacobson phases are described by the formula A’[An-1BnO3n+1]. The structure of these compounds includes perovskite layers separated by layers, in which are only metal cations, usually alkaline or alkaline earth. The materials with layered perovskite-related structures have many various applications due to their different physical-chemical properties. These properties are dependent on the nature of ions in the crystal lattice. For the last decades, different compositions with layers of perovskite structures were described as superconductors, giant and colossal magnetoresistors, microwave dielectrics, phosphors, mixed ionic and electronic conductors, dielectrics, magnetic materials, thermoelectrics, photocatalysts for hydrogen production, materials for high-efficiency photovoltaic cells, oxygen-ionic conductors, protonic conductors.

In this Special Issue, we wish to cover the most recent advances in all these aspects of layered perovskites by hosting a mix of original research articles and short critical reviews.

Prof. Dr. Nataliia Tarasova
Guest Editor

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ceramics
  • layered perovskites
  • ion conductivity
  • photovoltaics
  • superconductors
  • phosphors
  • photocatalysts

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Published Papers (4 papers)

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Research

12 pages, 3833 KiB  
Article
Phase Behavior and Defect Structure of HoBaCo2O6-δ
by Roman E. Yagovitin, Dmitry S. Tsvetkov, Ivan L. Ivanov, Dmitry A. Malyshkin, Vladimir V. Sereda and Andrey Yu. Zuev
Inorganics 2023, 11(9), 361; https://doi.org/10.3390/inorganics11090361 - 5 Sep 2023
Cited by 1 | Viewed by 1103
Abstract
The differential scanning calorimetry study showed that the double perovskite HoBaCo2O6-δ (HBC), depending on its oxygen content, undergoes three phase transitions in the temperature range 298–773 K. Their origin was tentatively explained using the relevant literature data. For the single-phase [...] Read more.
The differential scanning calorimetry study showed that the double perovskite HoBaCo2O6-δ (HBC), depending on its oxygen content, undergoes three phase transitions in the temperature range 298–773 K. Their origin was tentatively explained using the relevant literature data. For the single-phase tetragonal HBC, the oxygen nonstoichiometry dependences on the oxygen partial pressure were investigated by thermogravimetric and flow reactor methods in the intermediate-temperature range of 573–773 K. The proposed defect structure of HBC was successfully verified using the obtained data on its oxygen nonstoichiometry combined with those reported earlier. As a result, the values of the thermodynamic parameters (∆Hi∘, ∆Si∘) of the defect reactions proceeding in HBC were determined. The defect structure of HBC was shown to be similar to that of YBaCo2O6-δ (YBC) likely due to similar ionic radii of Ho3+ and Y3+. Full article
(This article belongs to the Special Issue Layered Perovskites: Synthesis, Properties and Structures)
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12 pages, 3812 KiB  
Article
Improved Oxide Ion Conductivity of Hexagonal Perovskite-Related Oxides Ba3W1+xV1−xO8.5+x/2
by Yugo Kikuchi, Yuta Yasui, James R. Hester and Masatomo Yashima
Inorganics 2023, 11(6), 238; https://doi.org/10.3390/inorganics11060238 - 29 May 2023
Cited by 4 | Viewed by 1680
Abstract
Hexagonal perovskite-related oxides such as Ba3WVO8.5 have attracted much attention due to their unique crystal structures and significant oxide ion conduction. However, the oxide ion conductivity of Ba3WVO8.5 is not very high. Herein, we report new hexagonal [...] Read more.
Hexagonal perovskite-related oxides such as Ba3WVO8.5 have attracted much attention due to their unique crystal structures and significant oxide ion conduction. However, the oxide ion conductivity of Ba3WVO8.5 is not very high. Herein, we report new hexagonal perovskite-related oxides Ba3W1+xV1−xO8.5+x/2 (x = −0.1, −0.05, 0.05, 0.1, 0.25, 0.4, 0.5, 0.6, and 0.75). The bulk conductivity of Ba3W1.6V0.4O8.8 was found to be 21 times higher than that of the mother material Ba3WVO8.5 at 500 °C. Maximum entropy method (MEM) neutron scattering length density (NSLD) analyses of neutron diffraction data at 800 °C experimentally visualized the oxide ion diffusion pathways through the octahedral O2 and tetrahedral O3 sites in intrinsically oxygen-deficient layers. By increasing the excess W content x in Ba3W1+xV1−xO8.5+x/2, the excess oxygen content x/2 increases, which leads to more oxygen atoms at the O2 and O3 oxygen sites, a higher minimum NSLD on the O2–O3 path, and a higher level of conductivity. Another reason for the increased conductivity of Ba3W1.6V0.4O8.8 is the lower activation energy for oxide ion conduction, which can be ascribed to the longer (W/V)–O2 and (W/V)–O3 distances due to the substitution of V atoms with large-sized W species. The present findings open new avenues in the science and technology of oxide ion conductors. Full article
(This article belongs to the Special Issue Layered Perovskites: Synthesis, Properties and Structures)
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12 pages, 7888 KiB  
Article
Oxygen-Ion and Proton Transport of Origin and Ca-Doped La2ZnNdO5.5 Materials
by Ksenia Belova, Anastasia Egorova, Svetlana Pachina, Irina Animitsa and Dmitry Medvedev
Inorganics 2023, 11(5), 196; https://doi.org/10.3390/inorganics11050196 - 1 May 2023
Viewed by 1634
Abstract
Oxygen-ionic and proton-conducting oxides are widely studied materials for their application in various electrochemical devices such as solid oxide fuel cells and electrolyzers. Rare earth oxides are known as a class of ionic conductors. In this paper, La2ZnNdO5.5 and its [...] Read more.
Oxygen-ionic and proton-conducting oxides are widely studied materials for their application in various electrochemical devices such as solid oxide fuel cells and electrolyzers. Rare earth oxides are known as a class of ionic conductors. In this paper, La2ZnNdO5.5 and its Ca-doped derivatives La2Nd0.9Ca0.1ZnO5.45 and La2ZnNd0.9Ca0.1O5.45 were obtained by a solid-state reaction route. Phase composition, lattice parameters, and hydration capability were investigated by X-ray diffraction and thermogravimetric analyses. The conductivities of these materials were measured by the electrochemical impedance spectroscopy technique in dry (pH2O = 3.5 × 10−5 atm) and wet (pH2O = 2 × 10−2 atm) air. All phases crystallized in a trigonal symmetry with P3m1 space group. The conductivity difference between undoped and calcium-doped samples is more than two orders of magnitude due to the appearance of oxygen vacancies during acceptor doping, which are responsible for a higher ionic conductivity. The La2Nd0.9Ca0.1ZnO5.45 sample shows the highest conductivity of about 10−3 S∙cm−1 at 650 °C. The Ca-doped phases are capable of reversible water uptake, confirming their proton-conducting nature. Full article
(This article belongs to the Special Issue Layered Perovskites: Synthesis, Properties and Structures)
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13 pages, 3516 KiB  
Article
Oxygen Ion and Proton Transport in Alkali-Earth Doped Layered Perovskites Based on BaLa2In2O7
by Nataliia Tarasova, Anzhelika Bedarkova, Irina Animitsa, Ksenia Belova, Ekaterina Abakumova, Polina Cheremisina and Dmitry Medvedev
Inorganics 2022, 10(10), 161; https://doi.org/10.3390/inorganics10100161 - 1 Oct 2022
Cited by 11 | Viewed by 1978
Abstract
Inorganic materials with layered perovskite structures have a wide range of physical and chemical properties. Layered perovskites based on BaLanInnO3n+1 (n = 1, 2) were recently investigated as protonic conductors. This work focused on the [...] Read more.
Inorganic materials with layered perovskite structures have a wide range of physical and chemical properties. Layered perovskites based on BaLanInnO3n+1 (n = 1, 2) were recently investigated as protonic conductors. This work focused on the oxygen ion and proton transport (ionic conductivity and mobility) in alkali-earth (Sr2+, Ba2+)-doped layered perovskites based on BaLa2In2O7. It is shown that in the dry air conditions, the nature of conductivity is mixed oxygen–hole, despite the dopant nature. Doping leads to the increase in the conductivity values by up to ~1.5 orders of magnitude. The most proton-conductive BaLa1.7Ba0.3In2O6.85 and BaLa1.7Sr0.15In2O6.925 samples are characterized by the conductivity values 1.2·10−4 S/cm and 0.7·10−4 S/cm at 500 °C under wet air, respectively. The layered perovskites with Ruddlesden-Popper structure, containing two layers of perovskite blocks, are the prospective proton-conducting materials and further material science searches among this class of materials is relevant. Full article
(This article belongs to the Special Issue Layered Perovskites: Synthesis, Properties and Structures)
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