Special Issue "Electroceramic Materials: Composition–Structure–Property Relationships 2021"

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

Deadline for manuscript submissions: 31 December 2021.

Special Issue Editor

Prof. Dr. Héctor Beltrán-Mir
E-Mail Website
Guest Editor
Department of Inorganic and Organic Chemistry, Universidad Jaume I of Castellón, Avenida Sos Baynat s/n, 12071 Castellón, Spain
Interests: low temperature synthesis; impedance spectroscopy; solid state chemistry; ferroelectrics; ionic conductors; materials chemistry; nanomaterials

Special Issue Information

Dear Colleagues,

Electroceramics include advanced ceramic materials that have interesting and useful electrical, optical, and magnetic properties that are applied in a wide variety of applications. Their unique properties have gained increasing importance in many technologies including communications, energy conversion and storage, electronics, and automation. This growing field includes dielectric, piezoelectric, ferroelectric, multiferroic, ionically conducting, semiconducting, and superconducting ceramics used in different domains such as consumer electronics, medicine and health, power engineering, or communication. Many of the electroceramic materials are inorganic solids (polycrystalline oxides) with potential electrical properties. Properties depend on the stoichiometry but also on the overall crystal and defect structures of the solids, as well as on interfacial effects. For this purpose, the preparation of the material using different synthesis methodologies, if this is possible at low temperatures, as well as the use of different techniques such as spark plasma sintering, flash sintering, or cold sintering, for its processing, is one of the most important aspects to obtain good materials and to find more advanced electroceramics. Thus, obtaining high-quality electroceramic materials involves being able to understand and optimise the composition–structure–property relationship.

This Special Issue will be an interesting interdisciplinary medium to collect research and contributions of recent advances, covering fundamental aspects of electroceramic materials: from synthesis and processing to properties. The recent advances included in this issue will be of interest to researchers and students working in this field. Therefore, I invite you to contribute papers in this growing and interesting area.

Assoc. Prof. Dr. Héctor Beltrán-Mir
Guest Editor

Manuscript Submission Information

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Keywords

  • low-temperature processing
  • sintering of electroceramic materials
  • field-assisted sintering
  • local structure
  • impedance spectroscopy
  • thin films
  • dielectrics
  • thermistors
  • lead-free piezoelectrics
  • electronic conductors
  • ferroelectrics
  • ionic conductors

Published Papers (3 papers)

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Research

Article
Effect of Reduced Atmosphere Sintering on Blocking Grain Boundaries in Rare-Earth Doped Ceria
Inorganics 2021, 9(8), 63; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9080063 - 09 Aug 2021
Viewed by 426
Abstract
Rare-earth doped ceria materials are amongst the top choices for use in electrolytes and composite electrodes in intermediate temperature solid oxide fuel cells. Trivalent acceptor dopants such as gadolinium, which mediate the ionic conductivity in ceria by creating oxygen vacancies, have a tendency [...] Read more.
Rare-earth doped ceria materials are amongst the top choices for use in electrolytes and composite electrodes in intermediate temperature solid oxide fuel cells. Trivalent acceptor dopants such as gadolinium, which mediate the ionic conductivity in ceria by creating oxygen vacancies, have a tendency to segregate at grain boundaries and triple points. This leads to formation of ionically resistive blocking grain boundaries and necessitates high operating temperatures to overcome this barrier. In an effort to improve the grain boundary conductivity, we studied the effect of a modified sintering cycle, where 10 mol% gadolinia doped ceria was sintered under a reducing atmosphere and subsequently reoxidized. A detailed analysis of the complex impedance, conductivity, and activation energy values was performed. The analysis shows that for samples processed thus, the ionic conductivity improves when compared with conventionally processed samples sintered in air. Equivalent circuit fitting shows that this improvement in conductivity is mainly due to a drop in the grain boundary resistance. Based on comparison of activation energy values for the conventionally processed vs. reduced-reoxidized samples, this drop can be attributed to a diminished blocking effect of defect-associates at the grain boundaries. Full article
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Article
Bi2O3-Modified Ceramics Based on BaTiO3 Powder Synthesized in Water Vapor
Inorganics 2020, 8(2), 8; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8020008 - 23 Jan 2020
Cited by 5 | Viewed by 1037
Abstract
Bi2O3 was investigated in the role of a modifier for BaTiO3 powder synthesized in a water vapor atmosphere at 200 °C and 1.55 MPa. Modification was aimed at increasing the sinterability of the powder as well as improving the [...] Read more.
Bi2O3 was investigated in the role of a modifier for BaTiO3 powder synthesized in a water vapor atmosphere at 200 °C and 1.55 MPa. Modification was aimed at increasing the sinterability of the powder as well as improving the structural and dielectric properties of the obtained ceramics. The morphology and phase contents of the synthesized BaTiO3 powder were controlled by the methods of SEM and XRD. Properties of pure and Bi-doped BaTiO3 ceramics were comprehensively studied by XRD, SEM, dielectric spectroscopy, and standard approaches for density and mechanical strength determination. Doping with Bi2O3 favored BaTiO3 ceramic densification and strengthening. The room-temperature dielectric constant and the loss tangent of Bi-doped BaTiO3 were shown to stabilize within the frequency range of 20 Hz to 2 MHz compared to non-doped material. The drop of dielectric constant between room temperature and Curie point was significantly reduced after Bi2O3 addition to BaTiO3. Bi2O3 appeared to be an effective modifier for BaTiO3 ceramics produced from non-stoichiometric powder synthesized in water vapor. Full article
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Article
Preparation and Characterization of Large Area Li-NASICON Electrolyte Thick Films
Inorganics 2019, 7(9), 107; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics7090107 - 26 Aug 2019
Cited by 4 | Viewed by 1536
Abstract
The preparation of solid electrolyte ceramic membranes is the object of intense study for its fundamental parts in the development of all solid-state batteries and improved battery separators. In this work, the procurement of large area solid electrolyte ceramic thick film membranes of [...] Read more.
The preparation of solid electrolyte ceramic membranes is the object of intense study for its fundamental parts in the development of all solid-state batteries and improved battery separators. In this work, the procurement of large area solid electrolyte ceramic thick film membranes of the Li-NASICON Li1.3Al0.3Ti1.7(PO4)3 (LATP) composition is attempted. Through the use of LATP powders from a sol–gel reaction, a slurry is formulated and tape casted. The green tapes are sintered using two sintering times. In both cases, ceramic thick films of a 5.5 × 5.5 cm2 area and ≈250 µm average thickness were obtained. The characterization indicated almost pure phase samples with a bi-modal microstructure composed of large and smaller grains, being larger for longer sintering time. The samples are porous and brittle, presenting very high “bulk” conductivity but lower total direct current (DC) one, as compared with the commercial Li-NASICON (OHARA) thick films with a similar area. The larger the grains, the poorer the total conductivity and the mechanical properties of the thick-films. The formation of poorly adhering grain boundaries as the grain size grows is responsible for the worsened properties. A better control of the microstructure is mandatory. Full article
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