Mixed Metal Oxides, 3rd Edition

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

Deadline for manuscript submissions: 30 November 2025 | Viewed by 852

Special Issue Editors


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Guest Editor

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Guest Editor Assistant
Institute of Chemistry, Vilnius University, LT-03225 Vilnius, Lithuania
Interests: luminescence; sol-gel synthesis; inorganics compounds; materials research; garnets

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Guest Editor Assistant
Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
Interests: sol-gel synthesis; molten salt synthesis; multiferroics; magnetism; phase transitions; manganites; ferrites

Special Issue Information

Dear Colleagues,

The Special Issue, “Mixed Metal Oxides”, published in Inorganics in 2018, collected ten excellent papers and attracted many potential readers and authors. Meanwhile, the second edition of this Special Issue, entitled “Mixed Metal Oxides II”, published in 2024, collected nine papers and received more than 19,000 views (as of 7 April 2025). This has encouraged us to build upon the success of the previous two Issues. Therefore, we would like to open a third edition in this Special Issue, “Mixed Metal Oxides, 3rd Edition”.

Developments in materials and nanomaterials science, combining different sciences, have brought us to another level of understanding of the properties of mixed-metal oxides. As mentioned previously, the area of application of mixed-metal oxides is very broad, and covers almost all aspects of human life. Therefore, the development of novel materials is a fundamental focal point of chemical research, particularly inorganic chemistry. Owing to this wide and diverse application potential of mixed-metal oxides, chemical routes for the preparation of pure and/or homogeneously doped different systems are still highly desirable. The quality of synthetic materials is highly dependent on the overall characteristics and features of the synthesized powders. These attributes include density, purity, phase composition, crystallinity, particle size, particle-size distribution, particle morphology, and specific surface area. Thus, all the mentioned material properties are highly sensitive to processing conditions, which are very much responsible for the crystallinity, crystal shape, crystal size, crystal size distribution and phase purity of the resulting powders.

Many research groups worldwide use exploratory approaches targeting the development of new solid compounds and functional materials. The scope of this Special Issue of Inorganics is once again focused on the synthesis, characterization and application of mixed-metal oxides and related materials, which are important in all areas of our life. Contributions offering a detailed understanding of reaction pathways at the level of the most basic steps of the formation of solids via in situ methods (X-ray and neutron diffraction, thermal analysis, Raman spectroscopy, etc.) are sought after. Works describing the research and application of soft chemistry approaches in the synthesis of various advanced multifunctional materials, as well as bulk and thin films, will be very much appreciated. Furthermore, investigations on the preparation of mixed-metal oxides, biomaterials and nanomaterials using solid-state reaction, sol–gel, co-precipitation, hydrothermal and other synthesis methods are also desired. We look forward to your contributions.

Prof. Dr. Aivaras Kareiva
Guest Editor

Dr. Greta Inkrataitė
Dr. Dovydas Karoblis
Guest Editor Assistants

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Keywords

  • multifunctional metal oxides
  • catalysts
  • microstructure
  • physical properties
  • nanoparticles
  • nanoclusters
  • nanocomposites
  • solid-state chemistry

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Published Papers (2 papers)

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Research

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12 pages, 2734 KB  
Article
Effect of CaO/SiO2 and MgO/Al2O3 on the Metallurgical Properties of Low Boron-Bearing High-Alumina Slag
by Ye Sun, Zuoliang Zhang, Chunlei Wu and Zhenggen Liu
Inorganics 2025, 13(11), 346; https://doi.org/10.3390/inorganics13110346 - 24 Oct 2025
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Abstract
For optimizing the operational efficiency and productivity within blast furnace processes, a profound understanding of the viscous flow characteristics of CaO–SiO2–MgO–Al2O3–B2O3 slag systems is of paramount importance. In this study, we conducted a comprehensive [...] Read more.
For optimizing the operational efficiency and productivity within blast furnace processes, a profound understanding of the viscous flow characteristics of CaO–SiO2–MgO–Al2O3–B2O3 slag systems is of paramount importance. In this study, we conducted a comprehensive investigation into the influence of the CaO/SiO2 and MgO/Al2O3 ratios on the viscosity, break point temperature (TBr), and activation energy (Eη) of low boron-bearing high-alumina slag. Concurrently, we elucidated the underlying mechanisms through which these ratios affect the viscous behavior of the slag by employing a combination of analytical techniques, including X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and thermodynamic modeling using the Factsage software. The experimental findings reveal that, as the CaO/SiO2 ratio increases from 1.10 to 1.30, the slag viscosity at 1773 K decreases from 0.316 Pa·s to 0.227 Pa·s, while both the TBr and Eη exhibit an upward trend, rising from 1534 K and 117.01 kJ·mol−1 to 1583 K and 182.86 kJ·mol−1, respectively. Conversely, an elevation in the MgO/Al2O3 ratio from 0.40 to 0.65 results in a reduction in slag viscosity at 1773 K from 0.290 Pa·s to 0.208 Pa·s, accompanied by a decrease in TBr from 1567 K to 1542 K. The observed deterioration in slag flow properties can be attributed to an enhanced polymerization degree of complex viscous structural units within the slag matrix. Ultimately, our study identifies that an optimal viscous performance of the slag is achieved when the CaO/SiO2 ratio is maintained at 1.25 and the MgO/Al2O3 ratio is maintained at 0.55, providing valuable insights for the rational design and control of blast furnace slag systems. Full article
(This article belongs to the Special Issue Mixed Metal Oxides, 3rd Edition)
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Review

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17 pages, 1113 KB  
Review
Towards Sustainable Processing of Chromite Resources: A Review of Methods for Magnesium and Platinum-Group Metal Extraction
by Rinat Abdulvaliyev, Yerkezhan Abikak, Nazym Akhmadiyeva, Sergey Gladyshev, Alfiyam Manapova and Asiya Kasymzhanova
Inorganics 2025, 13(11), 353; https://doi.org/10.3390/inorganics13110353 - 27 Oct 2025
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Abstract
This article provides a review of modern technologies for processing chromite ores and beneficiation wastes, with a focus on the recovery of magnesium and platinum-group metals (PGMs). It reveals that the traditional use of chromites solely as a source of chromium limits the [...] Read more.
This article provides a review of modern technologies for processing chromite ores and beneficiation wastes, with a focus on the recovery of magnesium and platinum-group metals (PGMs). It reveals that the traditional use of chromites solely as a source of chromium limits the potential of this raw material, whereas comprehensive processing enables the recovery of associated components, including serpentine minerals, which are widely present in chromite ores and tailings. Pyrometallurgical, hydrometallurgical, plasma-arc, and biotechnological methods are examined, as well as their integration into combined flowsheets. Particular attention is given to sulfation, chloridization, and carbochlorination processes, which ensure a high degree of PGM recovery. Economic and environmental aspects of comprehensive processing are discussed, including carbon footprint reduction, waste minimization, and prospects for the development of “green metallurgy.” It is concluded that the further advancement of resource-efficient and environmentally safe technologies for chromite processing will increase production efficiency, ensure resource independence, and support compliance with global carbon neutrality requirements. Full article
(This article belongs to the Special Issue Mixed Metal Oxides, 3rd Edition)
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